dlls/ntdll/time.c

   1 /*
   2  * Nt time functions.
   3  *
   4  * RtlTimeToTimeFields, RtlTimeFieldsToTime and defines are taken from ReactOS and
   5  * adapted to wine with special permissions of the author. This code is
   6  * Copyright 2002 Rex Jolliff (rex@lvcablemodem.com)
   7  *
   8  * Copyright 1999 Juergen Schmied
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  23  */
  24
  25 #include "config.h"
  26 #include "wine/port.h"
  27
  28 #include <stdarg.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <limits.h>
  32 #include <time.h>
  33 #ifdef HAVE_SYS_TIME_H
  34 # include <sys/time.h>
  35 #endif
  36 #ifdef HAVE_UNISTD_H
  37 # include <unistd.h>
  38 #endif
  39
  40 #define NONAMELESSUNION
  41 #define NONAMELESSSTRUCT
  42 #include "ntstatus.h"
  43 #define WIN32_NO_STATUS
  44 #include "windef.h"
  45 #include "winternl.h"
  46 #include "wine/unicode.h"
  47 #include "wine/debug.h"
  48 #include "ntdll_misc.h"
  49
  50 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
  51
  52 static RTL_CRITICAL_SECTION TIME_GetBias_section;
  53 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
  54 {
  55     0, 0, &TIME_GetBias_section,
  56     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  57       0, 0, { (DWORD_PTR)(__FILE__ ": TIME_GetBias_section") }
  58 };
  59 static RTL_CRITICAL_SECTION TIME_GetBias_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  60
  61 /* TimeZone registry key values */
  62 static const WCHAR TZInformationKeyW[] = { 'M','a','c','h','i','n','e','\\',
  63  'S','Y','S','T','E','M','\\','C','u','r','r','e','n','t','C','o','n','t','r',
  64  'o','l','S','e','t','\\','C','o','n','t','r','o','l','\\','T','i','m','e','z',
  65  'o','n','e','I','n','f','o','r','m','a','t','i','o','n', 0};
  66 static const WCHAR TZStandardStartW[] = {
  67   'S','t','a','n','d','a','r','d','s','t','a','r','t', 0};
  68 static const WCHAR TZDaylightStartW[] = {
  69   'D','a','y','l','i','g','h','t','s','t','a','r','t', 0};
  70 static const WCHAR TZDaylightBiasW[] = {
  71     'D','a','y','l','i','g','h','t','B','i','a','s', 0};
  72 static const WCHAR TZStandardBiasW[] = {
  73     'S','t','a','n','d','a','r','d','B','i','a','s', 0};
  74 static const WCHAR TZBiasW[] = {'B','i','a','s', 0};
  75 static const WCHAR TZDaylightNameW[] = {
  76     'D','a','y','l','i','g','h','t','N','a','m','e', 0};
  77 static const WCHAR TZStandardNameW[] = {
  78     'S','t','a','n','d','a','r','d','N','a','m','e', 0};
  79
  80
  81 #define SETTIME_MAX_ADJUST 120
  82
  83 /* This structure is used to store strings that represent all of the time zones
  84  * in the world. (This is used to help GetTimeZoneInformation)
  85  */
  86 struct tagTZ_INFO
  87 {
  88     const char *psTZFromUnix;
  89     WCHAR psTZWindows[32];
  90     int bias;
  91     int dst;
  92 };
  93
  94 static const struct tagTZ_INFO TZ_INFO[] =
  95 {
  96    {"MHT",
  97     {'D','a','t','e','l','i','n','e',' ','S','t','a','n','d','a','r','d',' ',
  98      'T','i','m','e','\0'}, -720, 0},
  99    {"SST",
 100     {'S','a','m','o','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 101      'e','\0'}, 660, 0},
 102    {"HST",
 103     {'H','a','w','a','i','i','a','n',' ','S','t','a','n','d','a','r','d',' ',
 104      'T','i','m','e','\0'}, 600, 0},
 105    {"AKST",
 106     {'A','l','a','s','k','a','n',' ','S','t','a','n','d','a','r','d',' ',
 107      'T','i','m','e',0}, 540, 0 },
 108    {"AKDT",
 109     {'A','l','a','s','k','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 110      'i','m','e','\0'}, 480, 1},
 111    {"PST",
 112     {'P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r','d',' ','T',
 113      'i','m','e','\0'}, 480, 0},
 114    {"PDT",
 115     {'P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r','d',' ','T',
 116      'i','m','e','\0'}, 420, 1},
 117    {"MST",
 118     {'U','S',' ','M','o','u','n','t','a','i','n',' ','S','t','a','n','d','a',
 119      'r','d',' ','T','i','m','e','\0'}, 420, 0},
 120    {"MDT",
 121     {'M','o','u','n','t','a','i','n',' ','S','t','a','n','d','a','r','d',' ',
 122      'T','i','m','e','\0'}, 360, 1},
 123    {"CST",
 124     {'C','e','n','t','r','a','l',' ','A','m','e','r','i','c','a',' ','S','t',
 125      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, 360, 0},
 126    {"CDT",
 127     {'C','e','n','t','r','a','l',' ','S','t','a','n','d','a','r','d',' ','T',
 128      'i','m','e','\0'}, 300, 1},
 129    {"COT",
 130     {'S','A',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r',
 131      'd',' ','T','i','m','e','\0'}, 300, 0},
 132    {"PET",
 133     {'S','A',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r',
 134      'd',' ','T','i','m','e',0}, 300, 0 },
 135    {"EDT",
 136     {'E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r','d',' ','T',
 137      'i','m','e','\0'}, 240, 1},
 138    {"EST",
 139     {'U','S',' ','E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 140      'd',' ','T','i','m','e','\0'}, 300, 0},
 141    {"ECT",
 142     {'E','a','s','t','e','r','n',' ','C','e','n','t','r','a','l',' ','S','t','a','n','d','a','r',
 143      'd',' ','T','i','m','e','\0'}, 300, 0},
 144    {"ADT",
 145     {'A','t','l','a','n','t','i','c',' ','S','t','a','n','d','a','r','d',' ',
 146      'T','i','m','e','\0'}, 180, 1},
 147    {"VET",
 148     {'S','A',' ','W','e','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 149      'd',' ','T','i','m','e','\0'}, 240, 0},
 150    {"CLT",
 151     {'P','a','c','i','f','i','c',' ','S','A',' ','S','t','a','n','d','a','r',
 152      'd',' ','T','i','m','e','\0'}, 240, 0},
 153    {"CLST",
 154     {'P','a','c','i','f','i','c',' ','S','A',' ','S','t','a','n','d','a','r',
 155      'd',' ','T','i','m','e',0}, 180, 1},
 156    {"AST",
 157     {'A','t','l','a','n','t','i','c',' ','S','t','a','n','d','a','r','d',' ',
 158      'T','i','m','e',0}, 240, 0 },
 159    {"NDT",
 160     {'N','e','w','f','o','u','n','d','l','a','n','d',' ','S','t','a','n','d',
 161      'a','r','d',' ','T','i','m','e','\0'}, 150, 1},
 162    {"NST",
 163     {'N','e','w','f','o','u','n','d','l','a','n','d',' ','S','t','a','n','d',
 164      'a','r','d',' ','T','i','m','e',0}, 210, 0 },
 165    {"BRT",
 166     {'B','r','a','z','i','l','i','a','n',' ','S','t','a','n','d','a','r','d',
 167      ' ','T','i','m','e','\0'}, 180, 0},
 168    {"BRST",
 169     {'B','r','a','z','i','l','i','a','n',' ','S','u','m','m','e','r',
 170      ' ','T','i','m','e','\0'}, 120, 1},
 171    {"ART",
 172     {'S','A',' ','E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 173      'd',' ','T','i','m','e','\0'}, 180, 0},
 174    {"WGST",
 175     {'G','r','e','e','n','l','a','n','d',' ','S','t','a','n','d','a','r','d',
 176      ' ','T','i','m','e','\0'}, 120, 1},
 177    {"GST",
 178     {'M','i','d','-','A','t','l','a','n','t','i','c',' ','S','t','a','n','d',
 179      'a','r','d',' ','T','i','m','e','\0'}, 120, 0},
 180    {"AZOT",
 181     {'A','z','o','r','e','s',' ','S','t','a','n','d','a','r','d',' ','T','i',
 182      'm','e',0}, 60, 0},
 183    {"AZOST",
 184     {'A','z','o','r','e','s',' ','S','t','a','n','d','a','r','d',' ','T','i',
 185      'm','e','\0'}, 0, 1},
 186    {"CVT",
 187     {'C','a','p','e',' ','V','e','r','d','e',' ','S','t','a','n','d','a','r',
 188      'd',' ','T','i','m','e','\0'}, 60, 0},
 189    {"WEST",
 190     {'W','e','s','t','e','r','n',' ','E','u','r','o','p','e','a','n',' ','S','u','m','m','e','r',' ','T','i','m','e','\0'}, -60, 1},
 191    {"WET",
 192     {'G','r','e','e','n','w','i','c','h',' ','S','t','a','n','d','a','r','d',
 193      ' ','T','i','m','e','\0'}, 0, 0},
 194    {"BST",
 195     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 196     -60, 1},
 197    {"IST",
 198     {'I','r','i','s','h',' ','S','u','m','m','e','r',' ','T','i','m','e','\0'},
 199     -60, 1},
 200    {"GMT",
 201     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 202     0, 0},
 203    {"UTC",
 204     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 205     0, 0},
 206    {"CET",
 207     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e','a','n',' ',
 208      'T','i','m','e','\0'}, -60, 0},
 209    {"CEST",
 210     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','S','t','a',
 211      'n','d','a','r','d',' ','T','i','m','e','\0'}, -120, 1},
 212    {"MET",
 213     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','S','t','a',
 214      'n','d','a','r','d',' ','T','i','m','e','\0'}, -60, 0},
 215    {"MEST",
 216     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','D','a','y',
 217      'l','i','g','h','t',' ','T','i','m','e','\0'}, -120, 1},
 218    {"WAT",
 219     {'W','.',' ','C','e','n','t','r','a','l',' ','A','f','r','i','c','a',' ',
 220      'S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'}, -60, 0},
 221    {"EEST",
 222     {'E','.',' ','E','u','r','o','p','e',' ','S','t','a','n','d','a','r','d',
 223      ' ','T','i','m','e','\0'}, -180, 1},
 224    {"EET",
 225     {'E','g','y','p','t',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 226      'e','\0'}, -120, 0},
 227    {"CAT",
 228     {'C','e','n','t','r','a','l',' ','A','f','r','i','c','a','n',' '
 229     ,'T','i','m','e','\0'}, -120, 0},
 230    {"SAST",
 231     {'S','o','u','t','h',' ','A','f','r','i','c','a',' ','S','t','a','n','d',
 232      'a','r','d',' ','T','i','m','e','\0'}, -120, 0},
 233    {"IST",
 234     {'I','s','r','a','e','l',' ','S','t','a','n','d','a','r','d',' ','T','i',
 235      'm','e','\0'}, -120, 0},
 236    {"MSK",
 237     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 238      'i','m','e','\0'}, -180, 0},
 239    {"ADT",
 240     {'A','r','a','b','i','c',' ','S','t','a','n','d','a','r','d',' ','T','i',
 241      'm','e','\0'}, -240, 1},
 242    {"AST",
 243     {'A','r','a','b',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 244      '\0'}, -180, 0},
 245    {"MSD",
 246     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 247      'i','m','e','\0'}, -240, 1},
 248    {"EAT",
 249     {'E','.',' ','A','f','r','i','c','a',' ','S','t','a','n','d','a','r','d',
 250      ' ','T','i','m','e','\0'}, -180, 0},
 251    {"IRST",
 252     {'I','r','a','n',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 253      0},-210, 0 },
 254    {"IRST",
 255     {'I','r','a','n',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 256      '\0'}, -270, 1},
 257    {"GST",
 258     {'A','r','a','b','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 259      'i','m','e','\0'}, -240, 0},
 260    {"AZT",
 261     {'C','a','u','c','a','s','u','s',' ','S','t','a','n','d','a','r','d',' ',
 262      'T','i','m','e',0}, -240, 0 },
 263    {"AZST",
 264     {'C','a','u','c','a','s','u','s',' ','S','t','a','n','d','a','r','d',' ',
 265      'T','i','m','e','\0'}, -300, 1},
 266    {"AFT",
 267     {'A','f','g','h','a','n','i','s','t','a','n',' ','S','t','a','n','d','a',
 268      'r','d',' ','T','i','m','e','\0'}, -270, 0},
 269    {"SAMT",
 270     {'S','a','m','a','r','a',' ','S','t','a','n','d','a','r','d',' ','T','i',
 271      'm','e','\0'}, -270, 1},
 272    {"YEKT",
 273     {'U','r','a','l','s',' ','S','t','a','n','d','a','r','d',
 274      ' ','T','i','m','e',' ','(','W','i','n','t','e','r',')','\0'}, -300, 0},
 275    {"YEKST",
 276     {'U','r','a','l','s',' ','D','a','y','l','i','g','h','t',
 277      ' ','T','i','m','e',' ','(','S','u','m','m','e','r',')','\0'}, -360, 1},
 278    {"PKT",
 279     {'W','e','s','t',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',
 280      ' ','T','i','m','e','\0'}, -300, 0},
 281    {"IST",
 282     {'I','n','d','i','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 283      'e','\0'}, -330, 0},
 284    {"NPT",
 285     {'N','e','p','a','l',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 286      'e','\0'}, -345, 0},
 287    {"ALMST",
 288     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 289      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -420, 1},
 290    {"BDT",
 291     {'C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t','a','n','d',
 292      'a','r','d',' ','T','i','m','e','\0'}, -360, 0},
 293    {"LKT",
 294     {'S','r','i',' ','L','a','n','k','a',' ','S','t','a','n','d','a','r','d',
 295      ' ','T','i','m','e','\0'}, -360, 0},
 296    {"MMT",
 297     {'M','y','a','n','m','a','r',' ','S','t','a','n','d','a','r','d',' ','T',
 298      'i','m','e','\0'}, -390, 0},
 299    {"ICT",
 300     {'S','E',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',' ','T',
 301      'i','m','e','\0'}, -420, 0},
 302    {"KRAT",
 303     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 304      'd',' ','T','i','m','e',0}, -420, 0},
 305    {"KRAST",
 306     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 307      'd',' ','T','i','m','e','\0'}, -480, 1},
 308    {"IRKT",
 309     {'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
 310      'a','n','d','a','r','d',' ','T','i','m','e',0}, -480, 0},
 311    {"CST",
 312     {'C','h','i','n','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 313      'e','\0'}, -480, 0},
 314    {"IRKST",
 315     {'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
 316      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -540, 1},
 317    {"SGT",
 318     {'M','a','l','a','y',' ','P','e','n','i','n','s','u','l','a',' ','S','t',
 319      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 320    {"WST",
 321     {'W','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 322      'a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 323    {"JST",
 324     {'T','o','k','y','o',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 325      'e','\0'}, -540, 0},
 326    {"KST",
 327     {'K','o','r','e','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 328      'e','\0'}, -540, 0},
 329    {"YAKST",
 330     {'Y','a','k','u','t','s','k',' ','S','t','a','n','d','a','r','d',' ','T',
 331      'i','m','e','\0'}, -600, 1},
 332    {"CST",
 333     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a',
 334      'n','d','a','r','d',' ','T','i','m','e','\0'}, -570, 0},
 335    {"CST",
 336     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','D','a','y',
 337      'l','i','g','h','t',' ','T','i','m','e','\0'}, -630, 1},
 338    {"EST",
 339     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 340      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 341    {"EST",
 342     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 343      'a','r','d',' ','T','i','m','e','\0'}, -660, 1},
 344    {"GST",
 345     {'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
 346      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 347    {"VLAT",
 348     {'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
 349      'r','d',' ','T','i','m','e',0}, -600, 0 },
 350    {"ChST",
 351     {'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
 352      'a','r','d',' ','T','i','m','e',0}, -600, 0},
 353    {"VLAST",
 354     {'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
 355      'r','d',' ','T','i','m','e','\0'}, -660, 1},
 356    {"MAGT",
 357     {'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
 358      'a','n','d','a','r','d',' ','T','i','m','e',0}, -660, 0},
 359    {"MAGST",
 360     {'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
 361      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -720, 1},
 362    {"NZST",
 363     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','S','t','a','n','d','a',
 364      'r','d',' ','T','i','m','e','\0'}, -720, 0},
 365    {"NZDT",
 366     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','D','a','y','l','i','g',
 367      'h','t',' ','T','i','m','e','\0'}, -780, 1},
 368    {"FJT",
 369     {'F','i','j','i',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 370      '\0'}, -720, 0},
 371    {"TOT",
 372     {'T','o','n','g','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 373      'e','\0'}, -780, 0},
 374    {"NOVT",
 375     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 376      'a','n','d','a','r','d',' ','T','i','m','e',0 }, -360, 0},
 377    {"NOVT",
 378     {'N','o','v','o','s','i','b','i','r','s','k',' ','S','t','a','n','d','a',
 379      'r','d',' ','T','i','m','e','\0'}, -360, 1},
 380    {"ANAT",
 381     {'A','n','a','d','y','r',' ','S','t','a','n','d','a','r','d',' ','T','i',
 382      'm','e','\0'}, -720, 1},
 383    {"HKT",
 384     {'H','o','n','g',' ','K','o','n','g',' ','S','t','a','n','d','a','r','d',
 385      ' ','T','i','m','e','\0'}, -480, 0},
 386    {"UYT",
 387     {'U','r','u','g','u','a','y','a','n',' ','T','i','m','e','\0'}, 180, 0},
 388    {"MYT",
 389     {'M','a','l','a','y','s','i','a','n',' ','T','i','m','e','\0'}, -480, 0},
 390    {"PHT",
 391     {'P','h','i','l','i','p','p','i','n','e',' ','T','i','m','e','\0'}, -480, 0},
 392    {"NOVST",
 393     {'N','o','v','o','s','i','b','i','r','s','k',' ','S','u','m','m','e','r',
 394      ' ','T','i','m','e','\0'}, -480, 1},
 395    {"UZT",
 396     {'U','z','b','e','k','i','s','t','h','a','n',' ','T','i','m','e','\0'}, -300, 0}
 397 };
 398
 399 #define TICKSPERSEC        10000000
 400 #define TICKSPERMSEC       10000
 401 #define SECSPERDAY         86400
 402 #define SECSPERHOUR        3600
 403 #define SECSPERMIN         60
 404 #define MINSPERHOUR        60
 405 #define HOURSPERDAY        24
 406 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
 407 #define DAYSPERWEEK        7
 408 #define EPOCHYEAR          1601
 409 #define DAYSPERNORMALYEAR  365
 410 #define DAYSPERLEAPYEAR    366
 411 #define MONSPERYEAR        12
 412 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
 413 #define DAYSPERNORMALCENTURY (365 * 100 + 24)
 414 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
 415
 416 /* 1601 to 1970 is 369 years plus 89 leap days */
 417 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
 418 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
 419 /* 1601 to 1980 is 379 years plus 91 leap days */
 420 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
 421 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
 422 /* max ticks that can be represented as Unix time */
 423 #define TICKS_1601_TO_UNIX_MAX ((SECS_1601_TO_1970 + INT_MAX) * TICKSPERSEC)
 424
 425
 426 static const int MonthLengths[2][MONSPERYEAR] =
 427 {
 428         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 429         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 430 };
 431
 432 static inline int IsLeapYear(int Year)
 433 {
 434         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
 435 }
 436
 437 /***********************************************************************
 438  *              NTDLL_get_server_abstime
 439  *
 440  * Convert a NTDLL time into an abs_time_t struct to send to the server.
 441  */
 442 void NTDLL_get_server_abstime( abs_time_t *when, const LARGE_INTEGER *timeout )
 443 {
 444     UINT remainder;
 445
 446     if (!timeout)  /* infinite timeout */
 447     {
 448         when->sec = when->usec = 0;
 449     }
 450     else if (timeout->QuadPart <= 0)  /* relative timeout */
 451     {
 452         struct timeval tv;
 453
 454         if (-timeout->QuadPart > (LONGLONG)INT_MAX * TICKSPERSEC)
 455             when->sec = when->usec = INT_MAX;
 456         else
 457         {
 458             ULONG sec = RtlEnlargedUnsignedDivide( -timeout->QuadPart, TICKSPERSEC, &remainder );
 459             gettimeofday( &tv, 0 );
 460             when->sec = tv.tv_sec + sec;
 461             if ((when->usec = tv.tv_usec + (remainder / 10)) >= 1000000)
 462             {
 463                 when->usec -= 1000000;
 464                 when->sec++;
 465             }
 466             if (when->sec < tv.tv_sec)  /* overflow */
 467                 when->sec = when->usec = INT_MAX;
 468         }
 469     }
 470     else  /* absolute time */
 471     {
 472         if (timeout->QuadPart < TICKS_1601_TO_1970)
 473             when->sec = when->usec = 0;
 474         else if (timeout->QuadPart > TICKS_1601_TO_UNIX_MAX)
 475             when->sec = when->usec = INT_MAX;
 476         else
 477         {
 478             when->sec = RtlEnlargedUnsignedDivide( timeout->QuadPart - TICKS_1601_TO_1970,
 479                                                    TICKSPERSEC, &remainder );
 480             when->usec = remainder / 10;
 481         }
 482     }
 483 }
 484
 485
 486 /***********************************************************************
 487  *              NTDLL_from_server_abstime
 488  *
 489  * Convert a timeval struct from the server into an NTDLL time.
 490  */
 491 void NTDLL_from_server_abstime( LARGE_INTEGER *time, const abs_time_t *when )
 492 {
 493     time->QuadPart = when->sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 494     time->QuadPart += when->usec * 10;
 495 }
 496
 497
 498 /******************************************************************************
 499  *       RtlTimeToTimeFields [NTDLL.@]
 500  *
 501  * Convert a time into a TIME_FIELDS structure.
 502  *
 503  * PARAMS
 504  *   liTime     [I] Time to convert.
 505  *   TimeFields [O] Destination for the converted time.
 506  *
 507  * RETURNS
 508  *   Nothing.
 509  */
 510 VOID WINAPI RtlTimeToTimeFields(
 511         const LARGE_INTEGER *liTime,
 512         PTIME_FIELDS TimeFields)
 513 {
 514         int SecondsInDay;
 515         long int cleaps, years, yearday, months;
 516         long int Days;
 517         LONGLONG Time;
 518
 519         /* Extract millisecond from time and convert time into seconds */
 520         TimeFields->Milliseconds =
 521             (CSHORT) (( liTime->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
 522         Time = liTime->QuadPart / TICKSPERSEC;
 523
 524         /* The native version of RtlTimeToTimeFields does not take leap seconds
 525          * into account */
 526
 527         /* Split the time into days and seconds within the day */
 528         Days = Time / SECSPERDAY;
 529         SecondsInDay = Time % SECSPERDAY;
 530
 531         /* compute time of day */
 532         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 533         SecondsInDay = SecondsInDay % SECSPERHOUR;
 534         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 535         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 536
 537         /* compute day of week */
 538         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 539
 540         /* compute year, month and day of month. */
 541         cleaps=( 3 * ((4 * Days + 1227) / DAYSPERQUADRICENTENNIUM) + 3 ) / 4;
 542         Days += 28188 + cleaps;
 543         years = (20 * Days - 2442) / (5 * DAYSPERNORMALQUADRENNIUM);
 544         yearday = Days - (years * DAYSPERNORMALQUADRENNIUM)/4;
 545         months = (64 * yearday) / 1959;
 546         /* the result is based on a year starting on March.
 547          * To convert take 12 from Januari and Februari and
 548          * increase the year by one. */
 549         if( months < 14 ) {
 550             TimeFields->Month = months - 1;
 551             TimeFields->Year = years + 1524;
 552         } else {
 553             TimeFields->Month = months - 13;
 554             TimeFields->Year = years + 1525;
 555         }
 556         /* calculation of day of month is based on the wonderful
 557          * sequence of INT( n * 30.6): it reproduces the
 558          * 31-30-31-30-31-31 month lengths exactly for small n's */
 559         TimeFields->Day = yearday - (1959 * months) / 64 ;
 560         return;
 561 }
 562
 563 /******************************************************************************
 564  *       RtlTimeFieldsToTime [NTDLL.@]
 565  *
 566  * Convert a TIME_FIELDS structure into a time.
 567  *
 568  * PARAMS
 569  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 570  *   Time         [O] Destination for the converted time.
 571  *
 572  * RETURNS
 573  *   Success: TRUE.
 574  *   Failure: FALSE.
 575  */
 576 BOOLEAN WINAPI RtlTimeFieldsToTime(
 577         PTIME_FIELDS tfTimeFields,
 578         PLARGE_INTEGER Time)
 579 {
 580         int month, year, cleaps, day;
 581
 582         /* FIXME: normalize the TIME_FIELDS structure here */
 583         /* No, native just returns 0 (error) if the fields are not */
 584         if( tfTimeFields->Milliseconds< 0 || tfTimeFields->Milliseconds > 999 ||
 585                 tfTimeFields->Second < 0 || tfTimeFields->Second > 59 ||
 586                 tfTimeFields->Minute < 0 || tfTimeFields->Minute > 59 ||
 587                 tfTimeFields->Hour < 0 || tfTimeFields->Hour > 23 ||
 588                 tfTimeFields->Month < 1 || tfTimeFields->Month > 12 ||
 589                 tfTimeFields->Day < 1 ||
 590                 tfTimeFields->Day > MonthLengths
 591                     [ tfTimeFields->Month ==2 || IsLeapYear(tfTimeFields->Year)]
 592                     [ tfTimeFields->Month - 1] ||
 593                 tfTimeFields->Year < 1601 )
 594             return FALSE;
 595
 596         /* now calculate a day count from the date
 597          * First start counting years from March. This way the leap days
 598          * are added at the end of the year, not somewhere in the middle.
 599          * Formula's become so much less complicate that way.
 600          * To convert: add 12 to the month numbers of Jan and Feb, and
 601          * take 1 from the year */
 602         if(tfTimeFields->Month < 3) {
 603             month = tfTimeFields->Month + 13;
 604             year = tfTimeFields->Year - 1;
 605         } else {
 606             month = tfTimeFields->Month + 1;
 607             year = tfTimeFields->Year;
 608         }
 609         cleaps = (3 * (year / 100) + 3) / 4;   /* nr of "century leap years"*/
 610         day =  (36525 * year) / 100 - cleaps + /* year * dayperyr, corrected */
 611                  (1959 * month) / 64 +         /* months * daypermonth */
 612                  tfTimeFields->Day -          /* day of the month */
 613                  584817 ;                      /* zero that on 1601-01-01 */
 614         /* done */
 615
 616         Time->QuadPart = (((((LONGLONG) day * HOURSPERDAY +
 617             tfTimeFields->Hour) * MINSPERHOUR +
 618             tfTimeFields->Minute) * SECSPERMIN +
 619             tfTimeFields->Second ) * 1000 +
 620             tfTimeFields->Milliseconds ) * TICKSPERMSEC;
 621
 622         return TRUE;
 623 }
 624
 625 /***********************************************************************
 626  *       TIME_GetBias [internal]
 627  *
 628  * Helper function calculates delta local time from UTC.
 629  *
 630  * PARAMS
 631  *   utc [I] The current utc time.
 632  *   pdaylight [I] Local daylight.
 633  *
 634  * RETURNS
 635  *   The bias for the current timezone.
 636  */
 637 static int TIME_GetBias(time_t utc, int *pdaylight)
 638 {
 639     struct tm *ptm;
 640     static time_t last_utc;
 641     static int last_bias;
 642     static int last_daylight;
 643     int ret;
 644
 645     RtlEnterCriticalSection( &TIME_GetBias_section );
 646     if(utc == last_utc)
 647     {
 648         *pdaylight = last_daylight;
 649         ret = last_bias;
 650     } else
 651     {
 652         ptm = localtime(&utc);
 653         *pdaylight = last_daylight =
 654             ptm->tm_isdst; /* daylight for local timezone */
 655         ptm = gmtime(&utc);
 656         ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
 657         last_utc = utc;
 658         ret = last_bias = (int)(utc-mktime(ptm));
 659     }
 660     RtlLeaveCriticalSection( &TIME_GetBias_section );
 661     return ret;
 662 }
 663
 664 /******************************************************************************
 665  *        RtlLocalTimeToSystemTime [NTDLL.@]
 666  *
 667  * Convert a local time into system time.
 668  *
 669  * PARAMS
 670  *   LocalTime  [I] Local time to convert.
 671  *   SystemTime [O] Destination for the converted time.
 672  *
 673  * RETURNS
 674  *   Success: STATUS_SUCCESS.
 675  *   Failure: An NTSTATUS error code indicating the problem.
 676  */
 677 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 678                                           PLARGE_INTEGER SystemTime)
 679 {
 680     time_t gmt;
 681     int bias, daylight;
 682
 683     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 684
 685     gmt = time(NULL);
 686     bias = TIME_GetBias(gmt, &daylight);
 687
 688     SystemTime->QuadPart = LocalTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 689     return STATUS_SUCCESS;
 690 }
 691
 692 /******************************************************************************
 693  *       RtlSystemTimeToLocalTime [NTDLL.@]
 694  *
 695  * Convert a system time into a local time.
 696  *
 697  * PARAMS
 698  *   SystemTime [I] System time to convert.
 699  *   LocalTime  [O] Destination for the converted time.
 700  *
 701  * RETURNS
 702  *   Success: STATUS_SUCCESS.
 703  *   Failure: An NTSTATUS error code indicating the problem.
 704  */
 705 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 706                                           PLARGE_INTEGER LocalTime )
 707 {
 708     time_t gmt;
 709     int bias, daylight;
 710
 711     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 712
 713     gmt = time(NULL);
 714     bias = TIME_GetBias(gmt, &daylight);
 715
 716     LocalTime->QuadPart = SystemTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 717     return STATUS_SUCCESS;
 718 }
 719
 720 /******************************************************************************
 721  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 722  *
 723  * Convert a time into a count of seconds since 1970.
 724  *
 725  * PARAMS
 726  *   Time    [I] Time to convert.
 727  *   Seconds [O] Destination for the converted time.
 728  *
 729  * RETURNS
 730  *   Success: TRUE.
 731  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 732  */
 733 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 734 {
 735     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 736     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 737     tmp -= SECS_1601_TO_1970;
 738     if (tmp > 0xffffffff) return FALSE;
 739     *Seconds = (DWORD)tmp;
 740     return TRUE;
 741 }
 742
 743 /******************************************************************************
 744  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 745  *
 746  * Convert a time into a count of seconds since 1980.
 747  *
 748  * PARAMS
 749  *   Time    [I] Time to convert.
 750  *   Seconds [O] Destination for the converted time.
 751  *
 752  * RETURNS
 753  *   Success: TRUE.
 754  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 755  */
 756 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 757 {
 758     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 759     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 760     tmp -= SECS_1601_TO_1980;
 761     if (tmp > 0xffffffff) return FALSE;
 762     *Seconds = (DWORD)tmp;
 763     return TRUE;
 764 }
 765
 766 /******************************************************************************
 767  *       RtlSecondsSince1970ToTime [NTDLL.@]
 768  *
 769  * Convert a count of seconds since 1970 to a time.
 770  *
 771  * PARAMS
 772  *   Seconds [I] Time to convert.
 773  *   Time    [O] Destination for the converted time.
 774  *
 775  * RETURNS
 776  *   Nothing.
 777  */
 778 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 779 {
 780     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 781     Time->u.LowPart  = (DWORD)secs;
 782     Time->u.HighPart = (DWORD)(secs >> 32);
 783 }
 784
 785 /******************************************************************************
 786  *       RtlSecondsSince1980ToTime [NTDLL.@]
 787  *
 788  * Convert a count of seconds since 1980 to a time.
 789  *
 790  * PARAMS
 791  *   Seconds [I] Time to convert.
 792  *   Time    [O] Destination for the converted time.
 793  *
 794  * RETURNS
 795  *   Nothing.
 796  */
 797 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 798 {
 799     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 800     Time->u.LowPart  = (DWORD)secs;
 801     Time->u.HighPart = (DWORD)(secs >> 32);
 802 }
 803
 804 /******************************************************************************
 805  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 806  *
 807  * Convert a time to a count of elapsed seconds.
 808  *
 809  * PARAMS
 810  *   Time       [I] Time to convert.
 811  *   TimeFields [O] Destination for the converted time.
 812  *
 813  * RETURNS
 814  *   Nothing.
 815  */
 816 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 817 {
 818     LONGLONG time;
 819     INT rem;
 820
 821     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 822     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 823
 824     /* time is now in seconds */
 825     TimeFields->Year  = 0;
 826     TimeFields->Month = 0;
 827     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 828
 829     /* rem is now the remaining seconds in the last day */
 830     TimeFields->Second = rem % 60;
 831     rem /= 60;
 832     TimeFields->Minute = rem % 60;
 833     TimeFields->Hour = rem / 60;
 834 }
 835
 836 /***********************************************************************
 837  *       NtQuerySystemTime [NTDLL.@]
 838  *       ZwQuerySystemTime [NTDLL.@]
 839  *
 840  * Get the current system time.
 841  *
 842  * PARAMS
 843  *   Time [O] Destination for the current system time.
 844  *
 845  * RETURNS
 846  *   Success: STATUS_SUCCESS.
 847  *   Failure: An NTSTATUS error code indicating the problem.
 848  */
 849 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 850 {
 851     struct timeval now;
 852
 853     gettimeofday( &now, 0 );
 854     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 855     Time->QuadPart += now.tv_usec * 10;
 856     return STATUS_SUCCESS;
 857 }
 858
 859 /******************************************************************************
 860  *  NtQueryPerformanceCounter   [NTDLL.@]
 861  *
 862  *  Note: Windows uses a timer clocked at a multiple of 1193182 Hz. There is a
 863  *  good number of applications that crash when the returned frequency is either
 864  *  lower or higher then what Windows gives. Also too high counter values are
 865  *  reported to give problems.
 866  */
 867 NTSTATUS WINAPI NtQueryPerformanceCounter( PLARGE_INTEGER Counter, PLARGE_INTEGER Frequency )
 868 {
 869     struct timeval now;
 870
 871     if (!Counter) return STATUS_ACCESS_VIOLATION;
 872     gettimeofday( &now, 0 );
 873     /* convert a counter that increments at a rate of 1 MHz
 874      * to one of 1.193182 MHz, with some care for arithmetic
 875      * overflow ( will not overflow for 5000 years ) and
 876      * good accuracy ( 105/88 = 1.19318182) */
 877     Counter->QuadPart = (((now.tv_sec - server_start_time.sec) * (ULONGLONG)1000000 +
 878                           (now.tv_usec - server_start_time.usec)) * 105) / 88;
 879     if (Frequency) Frequency->QuadPart = 1193182;
 880     return STATUS_SUCCESS;
 881 }
 882
 883
 884 /******************************************************************************
 885  * NtGetTickCount   (NTDLL.@)
 886  * ZwGetTickCount   (NTDLL.@)
 887  */
 888 ULONG WINAPI NtGetTickCount(void)
 889 {
 890     struct timeval current_time;
 891
 892     gettimeofday(&current_time, NULL);
 893     return (current_time.tv_sec - server_start_time.sec) * 1000 +
 894            (current_time.tv_usec - server_start_time.usec) / 1000;
 895 }
 896
 897
 898 /***********************************************************************
 899  *        TIME_GetTZAsStr [internal]
 900  *
 901  * Helper function that returns the given timezone as a string.
 902  *
 903  * PARAMS
 904  *   utc [I] The current utc time.
 905  *   bias [I] The bias of the current timezone.
 906  *   dst [I] ??
 907  *
 908  * RETURNS
 909  *   Timezone name.
 910  *
 911  * NOTES:
 912  *   This could be done with a hash table instead of merely iterating through a
 913  *   table, however with the small amount of entries (60 or so) I didn't think
 914  *   it was worth it.
 915  */
 916 static const WCHAR* TIME_GetTZAsStr (time_t utc, int bias, int dst)
 917 {
 918    char psTZName[7];
 919    struct tm *ptm = localtime(&utc);
 920    unsigned int i;
 921
 922    if (!strftime (psTZName, 7, "%Z", ptm))
 923       return (NULL);
 924
 925    for (i=0; i<(sizeof(TZ_INFO) / sizeof(struct tagTZ_INFO)); i++)
 926    {
 927       if ( strcmp(TZ_INFO[i].psTZFromUnix, psTZName) == 0 &&
 928            TZ_INFO[i].bias == bias &&
 929            TZ_INFO[i].dst == dst
 930          )
 931             return TZ_INFO[i].psTZWindows;
 932    }
 933    FIXME("Can't match system time zone name \"%s\", bias=%d and dst=%d "
 934          "to an entry in TZ_INFO. Please add appropriate entry to "
 935          "TZ_INFO and submit as patch to wine-patches\n",psTZName,bias,dst);
 936    return NULL;
 937 }
 938
 939 /***  TIME_GetTimeZoneInfoFromReg: helper for GetTimeZoneInformation ***/
 940
 941
 942 static int TIME_GetTimeZoneInfoFromReg(RTL_TIME_ZONE_INFORMATION *tzinfo)
 943 {
 944     BYTE buf[90];
 945     KEY_VALUE_PARTIAL_INFORMATION * KpInfo =
 946         (KEY_VALUE_PARTIAL_INFORMATION *) buf;
 947     HANDLE hkey;
 948     DWORD size;
 949     OBJECT_ATTRIBUTES attr;
 950     UNICODE_STRING nameW;
 951
 952     attr.Length = sizeof(attr);
 953     attr.RootDirectory = 0;
 954     attr.ObjectName = &nameW;
 955     attr.Attributes = 0;
 956     attr.SecurityDescriptor = NULL;
 957     attr.SecurityQualityOfService = NULL;
 958     RtlInitUnicodeString( &nameW, TZInformationKeyW);
 959     if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr )) {
 960
 961 #define GTZIFR_N( valkey, tofield) \
 962         RtlInitUnicodeString( &nameW, valkey );\
 963         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 964                     sizeof(buf), &size )) { \
 965             if( size >= (sizeof((tofield)) + \
 966                     offsetof(KEY_VALUE_PARTIAL_INFORMATION,Data))) { \
 967                 memcpy(&(tofield), \
 968                         KpInfo->Data, sizeof(tofield)); \
 969             } \
 970         }
 971 #define GTZIFR_S( valkey, tofield) \
 972         RtlInitUnicodeString( &nameW, valkey );\
 973         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 974                     sizeof(buf), &size )) { \
 975             size_t len = (strlenW( (WCHAR*)KpInfo->Data ) + 1) * sizeof(WCHAR); \
 976             if (len > sizeof(tofield)) len = sizeof(tofield); \
 977             memcpy( tofield, KpInfo->Data, len ); \
 978             tofield[(len/sizeof(WCHAR))-1] = 0; \
 979         }
 980
 981         GTZIFR_N( TZStandardStartW,  tzinfo->StandardDate)
 982         GTZIFR_N( TZDaylightStartW,  tzinfo->DaylightDate)
 983         GTZIFR_N( TZBiasW,          tzinfo->Bias)
 984         GTZIFR_N( TZStandardBiasW,  tzinfo->StandardBias)
 985         GTZIFR_N( TZDaylightBiasW,  tzinfo->DaylightBias)
 986         GTZIFR_S( TZStandardNameW, tzinfo->StandardName)
 987         GTZIFR_S( TZDaylightNameW, tzinfo->DaylightName)
 988
 989 #undef GTZIFR_N
 990 #undef GTZIFR_S
 991         NtClose( hkey );
 992         return 1;
 993     }
 994     return 0;
 995 }
 996
 997 /***********************************************************************
 998  *      RtlQueryTimeZoneInformation [NTDLL.@]
 999  *
1000  * Get information about the current timezone.
1001  *
1002  * PARAMS
1003  *   tzinfo [O] Destination for the retrieved timezone info.
1004  *
1005  * RETURNS
1006  *   Success: STATUS_SUCCESS.
1007  *   Failure: An NTSTATUS error code indicating the problem.
1008  */
1009 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *tzinfo)
1010 {
1011     time_t gmt;
1012     int bias, daylight;
1013     const WCHAR *psTZ;
1014
1015     memset(tzinfo, 0, sizeof(RTL_TIME_ZONE_INFORMATION));
1016
1017     if( !TIME_GetTimeZoneInfoFromReg(tzinfo)) {
1018
1019         gmt = time(NULL);
1020         bias = TIME_GetBias(gmt, &daylight);
1021
1022         tzinfo->Bias = -bias / 60;
1023         tzinfo->StandardBias = 0;
1024         tzinfo->DaylightBias = -60;
1025         tzinfo->StandardName[0]='\0';
1026         tzinfo->DaylightName[0]='\0';
1027         psTZ = TIME_GetTZAsStr (gmt, (-bias/60), daylight);
1028         if (psTZ) strcpyW( tzinfo->StandardName, psTZ );
1029         }
1030     return STATUS_SUCCESS;
1031 }
1032
1033 /***********************************************************************
1034  *       RtlSetTimeZoneInformation [NTDLL.@]
1035  *
1036  * Set the current time zone information.
1037  *
1038  * PARAMS
1039  *   tzinfo [I] Timezone information to set.
1040  *
1041  * RETURNS
1042  *   Success: STATUS_SUCCESS.
1043  *   Failure: An NTSTATUS error code indicating the problem.
1044  *
1045  * BUGS
1046  *   Uses the obsolete unix timezone structure and tz_dsttime member.
1047  */
1048 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
1049 {
1050 #ifdef HAVE_SETTIMEOFDAY
1051     struct timezone tz;
1052
1053     tz.tz_minuteswest = tzinfo->Bias;
1054 #ifdef DST_NONE
1055     tz.tz_dsttime = DST_NONE;
1056 #else
1057     tz.tz_dsttime = 0;
1058 #endif
1059     if(!settimeofday(NULL, &tz))
1060         return STATUS_SUCCESS;
1061 #endif
1062     return STATUS_PRIVILEGE_NOT_HELD;
1063 }
1064
1065 /***********************************************************************
1066  *        NtSetSystemTime [NTDLL.@]
1067  *        ZwSetSystemTime [NTDLL.@]
1068  *
1069  * Set the system time.
1070  *
1071  * PARAMS
1072  *   NewTime [I] The time to set.
1073  *   OldTime [O] Optional destination for the previous system time.
1074  *
1075  * RETURNS
1076  *   Success: STATUS_SUCCESS.
1077  *   Failure: An NTSTATUS error code indicating the problem.
1078  */
1079 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
1080 {
1081     TIME_FIELDS tf;
1082     struct timeval tv;
1083     struct timezone tz;
1084     struct tm t;
1085     time_t sec, oldsec;
1086     int dst, bias;
1087     int err;
1088
1089     /* Return the old time if necessary */
1090     if(OldTime)
1091         NtQuerySystemTime(OldTime);
1092
1093     RtlTimeToTimeFields(NewTime, &tf);
1094
1095     /* call gettimeofday to get the current timezone */
1096     gettimeofday(&tv, &tz);
1097     oldsec = tv.tv_sec;
1098     /* get delta local time from utc */
1099     bias = TIME_GetBias(oldsec, &dst);
1100
1101     /* get the number of seconds */
1102     t.tm_sec = tf.Second;
1103     t.tm_min = tf.Minute;
1104     t.tm_hour = tf.Hour;
1105     t.tm_mday = tf.Day;
1106     t.tm_mon = tf.Month - 1;
1107     t.tm_year = tf.Year - 1900;
1108     t.tm_isdst = dst;
1109     sec = mktime (&t);
1110     /* correct for timezone and daylight */
1111     sec += bias;
1112
1113     /* set the new time */
1114     tv.tv_sec = sec;
1115     tv.tv_usec = tf.Milliseconds * 1000;
1116
1117     /* error and sanity check*/
1118     if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
1119         err = 2;
1120     } else {
1121 #ifdef HAVE_SETTIMEOFDAY
1122         err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
1123         if(err == 0)
1124             return STATUS_SUCCESS;
1125 #else
1126         err = 1;
1127 #endif
1128     }
1129
1130     ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
1131             tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
1132             (long)(sec-oldsec),
1133             err == -1 ? "No Permission"
1134                       : sec == (time_t)-1 ? "" : "is too large." );
1135
1136     if(err == 2)
1137         return STATUS_INVALID_PARAMETER;
1138     else if(err == -1)
1139         return STATUS_PRIVILEGE_NOT_HELD;
1140     else
1141         return STATUS_NOT_IMPLEMENTED;
1142 }