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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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    {"YEKST",
 273     {'E','k','a','t','e','r','i','n','b','u','r','g',' ','S','t','a','n','d',
 274      'a','r','d',' ','T','i','m','e','\0'}, -360, 1},
 275    {"PKT",
 276     {'W','e','s','t',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',
 277      ' ','T','i','m','e','\0'}, -300, 0},
 278    {"IST",
 279     {'I','n','d','i','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 280      'e','\0'}, -330, 0},
 281    {"NPT",
 282     {'N','e','p','a','l',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 283      'e','\0'}, -345, 0},
 284    {"ALMST",
 285     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 286      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -420, 1},
 287    {"BDT",
 288     {'C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t','a','n','d',
 289      'a','r','d',' ','T','i','m','e','\0'}, -360, 0},
 290    {"LKT",
 291     {'S','r','i',' ','L','a','n','k','a',' ','S','t','a','n','d','a','r','d',
 292      ' ','T','i','m','e','\0'}, -360, 0},
 293    {"MMT",
 294     {'M','y','a','n','m','a','r',' ','S','t','a','n','d','a','r','d',' ','T',
 295      'i','m','e','\0'}, -390, 0},
 296    {"ICT",
 297     {'S','E',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',' ','T',
 298      'i','m','e','\0'}, -420, 0},
 299    {"KRAT",
 300     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 301      'd',' ','T','i','m','e',0}, -420, 0},
 302    {"KRAST",
 303     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 304      'd',' ','T','i','m','e','\0'}, -480, 1},
 305    {"IRKT",
 306     {'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
 307      'a','n','d','a','r','d',' ','T','i','m','e',0}, -480, 0},
 308    {"CST",
 309     {'C','h','i','n','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 310      'e','\0'}, -480, 0},
 311    {"IRKST",
 312     {'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
 313      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -540, 1},
 314    {"SGT",
 315     {'M','a','l','a','y',' ','P','e','n','i','n','s','u','l','a',' ','S','t',
 316      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 317    {"WST",
 318     {'W','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 319      'a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 320    {"JST",
 321     {'T','o','k','y','o',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 322      'e','\0'}, -540, 0},
 323    {"KST",
 324     {'K','o','r','e','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 325      'e','\0'}, -540, 0},
 326    {"YAKST",
 327     {'Y','a','k','u','t','s','k',' ','S','t','a','n','d','a','r','d',' ','T',
 328      'i','m','e','\0'}, -600, 1},
 329    {"CST",
 330     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a',
 331      'n','d','a','r','d',' ','T','i','m','e','\0'}, -570, 0},
 332    {"CST",
 333     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','D','a','y',
 334      'l','i','g','h','t',' ','T','i','m','e','\0'}, -630, 1},
 335    {"EST",
 336     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 337      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 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'}, -660, 1},
 341    {"GST",
 342     {'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
 343      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 344    {"VLAT",
 345     {'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
 346      'r','d',' ','T','i','m','e',0}, -600, 0 },
 347    {"ChST",
 348     {'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
 349      'a','r','d',' ','T','i','m','e',0}, -600, 0},
 350    {"VLAST",
 351     {'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
 352      'r','d',' ','T','i','m','e','\0'}, -660, 1},
 353    {"MAGT",
 354     {'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
 355      'a','n','d','a','r','d',' ','T','i','m','e',0}, -660, 0},
 356    {"MAGST",
 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'}, -720, 1},
 359    {"NZST",
 360     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','S','t','a','n','d','a',
 361      'r','d',' ','T','i','m','e','\0'}, -720, 0},
 362    {"NZDT",
 363     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','D','a','y','l','i','g',
 364      'h','t',' ','T','i','m','e','\0'}, -780, 1},
 365    {"FJT",
 366     {'F','i','j','i',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 367      '\0'}, -720, 0},
 368    {"TOT",
 369     {'T','o','n','g','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 370      'e','\0'}, -780, 0},
 371    {"NOVT",
 372     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 373      'a','n','d','a','r','d',' ','T','i','m','e',0 }, -360, 0},
 374    {"NOVT",
 375     {'N','o','v','o','s','i','b','i','r','s','k',' ','S','t','a','n','d','a',
 376      'r','d',' ','T','i','m','e','\0'}, -360, 1},
 377    {"ANAT",
 378     {'A','n','a','d','y','r',' ','S','t','a','n','d','a','r','d',' ','T','i',
 379      'm','e','\0'}, -720, 1},
 380    {"HKT",
 381     {'H','o','n','g',' ','K','o','n','g',' ','S','t','a','n','d','a','r','d',
 382      ' ','T','i','m','e','\0'}, -480, 0},
 383    {"UYT",
 384     {'U','r','u','g','u','a','y','a','n',' ','T','i','m','e','\0'}, 180, 0},
 385    {"MYT",
 386     {'M','a','l','a','y','s','i','a','n',' ','T','i','m','e','\0'}, -480, 0},
 387    {"PHT",
 388     {'P','h','i','l','i','p','p','i','n','e',' ','T','i','m','e','\0'}, -480, 0},
 389    {"NOVST",
 390     {'N','o','v','o','s','i','b','i','r','s','k',' ','S','u','m','m','e','r',
 391      ' ','T','i','m','e','\0'}, -480, 1}
 392 };
 393
 394 #define TICKSPERSEC        10000000
 395 #define TICKSPERMSEC       10000
 396 #define SECSPERDAY         86400
 397 #define SECSPERHOUR        3600
 398 #define SECSPERMIN         60
 399 #define MINSPERHOUR        60
 400 #define HOURSPERDAY        24
 401 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
 402 #define DAYSPERWEEK        7
 403 #define EPOCHYEAR          1601
 404 #define DAYSPERNORMALYEAR  365
 405 #define DAYSPERLEAPYEAR    366
 406 #define MONSPERYEAR        12
 407 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
 408 #define DAYSPERNORMALCENTURY (365 * 100 + 24)
 409 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
 410
 411 /* 1601 to 1970 is 369 years plus 89 leap days */
 412 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
 413 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
 414 /* 1601 to 1980 is 379 years plus 91 leap days */
 415 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
 416 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
 417 /* max ticks that can be represented as Unix time */
 418 #define TICKS_1601_TO_UNIX_MAX ((SECS_1601_TO_1970 + INT_MAX) * TICKSPERSEC)
 419
 420
 421 static const int MonthLengths[2][MONSPERYEAR] =
 422 {
 423         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 424         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 425 };
 426
 427 static inline int IsLeapYear(int Year)
 428 {
 429         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
 430 }
 431
 432 /***********************************************************************
 433  *              NTDLL_get_server_timeout
 434  *
 435  * Convert a NTDLL timeout into a timeval struct to send to the server.
 436  */
 437 void NTDLL_get_server_timeout( abs_time_t *when, const LARGE_INTEGER *timeout )
 438 {
 439     UINT remainder;
 440
 441     if (!timeout)  /* infinite timeout */
 442     {
 443         when->sec = when->usec = 0;
 444     }
 445     else if (timeout->QuadPart <= 0)  /* relative timeout */
 446     {
 447         struct timeval tv;
 448
 449         if (-timeout->QuadPart > (LONGLONG)INT_MAX * TICKSPERSEC)
 450             when->sec = when->usec = INT_MAX;
 451         else
 452         {
 453             ULONG sec = RtlEnlargedUnsignedDivide( -timeout->QuadPart, TICKSPERSEC, &remainder );
 454             gettimeofday( &tv, 0 );
 455             when->sec = tv.tv_sec + sec;
 456             if ((when->usec = tv.tv_usec + (remainder / 10)) >= 1000000)
 457             {
 458                 when->usec -= 1000000;
 459                 when->sec++;
 460             }
 461             if (when->sec < tv.tv_sec)  /* overflow */
 462                 when->sec = when->usec = INT_MAX;
 463         }
 464     }
 465     else  /* absolute time */
 466     {
 467         if (timeout->QuadPart < TICKS_1601_TO_1970)
 468             when->sec = when->usec = 0;
 469         else if (timeout->QuadPart > TICKS_1601_TO_UNIX_MAX)
 470             when->sec = when->usec = INT_MAX;
 471         else
 472         {
 473             when->sec = RtlEnlargedUnsignedDivide( timeout->QuadPart - TICKS_1601_TO_1970,
 474                                                    TICKSPERSEC, &remainder );
 475             when->usec = remainder / 10;
 476         }
 477     }
 478 }
 479
 480
 481 /***********************************************************************
 482  *              NTDLL_from_server_timeout
 483  *
 484  * Convert a timeval struct from the server into an NTDLL timeout.
 485  */
 486 void NTDLL_from_server_timeout( LARGE_INTEGER *timeout, const abs_time_t *when )
 487 {
 488     timeout->QuadPart = when->sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 489     timeout->QuadPart += when->usec * 10;
 490 }
 491
 492
 493 /******************************************************************************
 494  *       RtlTimeToTimeFields [NTDLL.@]
 495  *
 496  * Convert a time into a TIME_FIELDS structure.
 497  *
 498  * PARAMS
 499  *   liTime     [I] Time to convert.
 500  *   TimeFields [O] Destination for the converted time.
 501  *
 502  * RETURNS
 503  *   Nothing.
 504  */
 505 VOID WINAPI RtlTimeToTimeFields(
 506         const LARGE_INTEGER *liTime,
 507         PTIME_FIELDS TimeFields)
 508 {
 509         int SecondsInDay;
 510         long int cleaps, years, yearday, months;
 511         long int Days;
 512         LONGLONG Time;
 513
 514         /* Extract millisecond from time and convert time into seconds */
 515         TimeFields->Milliseconds =
 516             (CSHORT) (( liTime->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
 517         Time = liTime->QuadPart / TICKSPERSEC;
 518
 519         /* The native version of RtlTimeToTimeFields does not take leap seconds
 520          * into account */
 521
 522         /* Split the time into days and seconds within the day */
 523         Days = Time / SECSPERDAY;
 524         SecondsInDay = Time % SECSPERDAY;
 525
 526         /* compute time of day */
 527         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 528         SecondsInDay = SecondsInDay % SECSPERHOUR;
 529         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 530         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 531
 532         /* compute day of week */
 533         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 534
 535         /* compute year, month and day of month. */
 536         cleaps=( 3 * ((4 * Days + 1227) / DAYSPERQUADRICENTENNIUM) + 3 ) / 4;
 537         Days += 28188 + cleaps;
 538         years = (20 * Days - 2442) / (5 * DAYSPERNORMALQUADRENNIUM);
 539         yearday = Days - (years * DAYSPERNORMALQUADRENNIUM)/4;
 540         months = (64 * yearday) / 1959;
 541         /* the result is based on a year starting on March.
 542          * To convert take 12 from Januari and Februari and
 543          * increase the year by one. */
 544         if( months < 14 ) {
 545             TimeFields->Month = months - 1;
 546             TimeFields->Year = years + 1524;
 547         } else {
 548             TimeFields->Month = months - 13;
 549             TimeFields->Year = years + 1525;
 550         }
 551         /* calculation of day of month is based on the wonderful
 552          * sequence of INT( n * 30.6): it reproduces the
 553          * 31-30-31-30-31-31 month lengths exactly for small n's */
 554         TimeFields->Day = yearday - (1959 * months) / 64 ;
 555         return;
 556 }
 557
 558 /******************************************************************************
 559  *       RtlTimeFieldsToTime [NTDLL.@]
 560  *
 561  * Convert a TIME_FIELDS structure into a time.
 562  *
 563  * PARAMS
 564  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 565  *   Time         [O] Destination for the converted time.
 566  *
 567  * RETURNS
 568  *   Success: TRUE.
 569  *   Failure: FALSE.
 570  */
 571 BOOLEAN WINAPI RtlTimeFieldsToTime(
 572         PTIME_FIELDS tfTimeFields,
 573         PLARGE_INTEGER Time)
 574 {
 575         int month, year, cleaps, day;
 576
 577         /* FIXME: normalize the TIME_FIELDS structure here */
 578         /* No, native just returns 0 (error) if the fields are not */
 579         if( tfTimeFields->Milliseconds< 0 || tfTimeFields->Milliseconds > 999 ||
 580                 tfTimeFields->Second < 0 || tfTimeFields->Second > 59 ||
 581                 tfTimeFields->Minute < 0 || tfTimeFields->Minute > 59 ||
 582                 tfTimeFields->Hour < 0 || tfTimeFields->Hour > 23 ||
 583                 tfTimeFields->Month < 1 || tfTimeFields->Month > 12 ||
 584                 tfTimeFields->Day < 1 ||
 585                 tfTimeFields->Day > MonthLengths
 586                     [ tfTimeFields->Month ==2 || IsLeapYear(tfTimeFields->Year)]
 587                     [ tfTimeFields->Month - 1] ||
 588                 tfTimeFields->Year < 1601 )
 589             return FALSE;
 590
 591         /* now calculate a day count from the date
 592          * First start counting years from March. This way the leap days
 593          * are added at the end of the year, not somewhere in the middle.
 594          * Formula's become so much less complicate that way.
 595          * To convert: add 12 to the month numbers of Jan and Feb, and
 596          * take 1 from the year */
 597         if(tfTimeFields->Month < 3) {
 598             month = tfTimeFields->Month + 13;
 599             year = tfTimeFields->Year - 1;
 600         } else {
 601             month = tfTimeFields->Month + 1;
 602             year = tfTimeFields->Year;
 603         }
 604         cleaps = (3 * (year / 100) + 3) / 4;   /* nr of "century leap years"*/
 605         day =  (36525 * year) / 100 - cleaps + /* year * dayperyr, corrected */
 606                  (1959 * month) / 64 +         /* months * daypermonth */
 607                  tfTimeFields->Day -          /* day of the month */
 608                  584817 ;                      /* zero that on 1601-01-01 */
 609         /* done */
 610
 611         Time->QuadPart = (((((LONGLONG) day * HOURSPERDAY +
 612             tfTimeFields->Hour) * MINSPERHOUR +
 613             tfTimeFields->Minute) * SECSPERMIN +
 614             tfTimeFields->Second ) * 1000 +
 615             tfTimeFields->Milliseconds ) * TICKSPERMSEC;
 616
 617         return TRUE;
 618 }
 619
 620 /***********************************************************************
 621  *       TIME_GetBias [internal]
 622  *
 623  * Helper function calculates delta local time from UTC.
 624  *
 625  * PARAMS
 626  *   utc [I] The current utc time.
 627  *   pdaylight [I] Local daylight.
 628  *
 629  * RETURNS
 630  *   The bias for the current timezone.
 631  */
 632 static int TIME_GetBias(time_t utc, int *pdaylight)
 633 {
 634     struct tm *ptm;
 635     static time_t last_utc;
 636     static int last_bias;
 637     static int last_daylight;
 638     int ret;
 639
 640     RtlEnterCriticalSection( &TIME_GetBias_section );
 641     if(utc == last_utc)
 642     {
 643         *pdaylight = last_daylight;
 644         ret = last_bias;
 645     } else
 646     {
 647         ptm = localtime(&utc);
 648         *pdaylight = last_daylight =
 649             ptm->tm_isdst; /* daylight for local timezone */
 650         ptm = gmtime(&utc);
 651         ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
 652         last_utc = utc;
 653         ret = last_bias = (int)(utc-mktime(ptm));
 654     }
 655     RtlLeaveCriticalSection( &TIME_GetBias_section );
 656     return ret;
 657 }
 658
 659 /******************************************************************************
 660  *        RtlLocalTimeToSystemTime [NTDLL.@]
 661  *
 662  * Convert a local time into system time.
 663  *
 664  * PARAMS
 665  *   LocalTime  [I] Local time to convert.
 666  *   SystemTime [O] Destination for the converted time.
 667  *
 668  * RETURNS
 669  *   Success: STATUS_SUCCESS.
 670  *   Failure: An NTSTATUS error code indicating the problem.
 671  */
 672 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 673                                           PLARGE_INTEGER SystemTime)
 674 {
 675     time_t gmt;
 676     int bias, daylight;
 677
 678     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 679
 680     gmt = time(NULL);
 681     bias = TIME_GetBias(gmt, &daylight);
 682
 683     SystemTime->QuadPart = LocalTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 684     return STATUS_SUCCESS;
 685 }
 686
 687 /******************************************************************************
 688  *       RtlSystemTimeToLocalTime [NTDLL.@]
 689  *
 690  * Convert a system time into a local time.
 691  *
 692  * PARAMS
 693  *   SystemTime [I] System time to convert.
 694  *   LocalTime  [O] Destination for the converted time.
 695  *
 696  * RETURNS
 697  *   Success: STATUS_SUCCESS.
 698  *   Failure: An NTSTATUS error code indicating the problem.
 699  */
 700 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 701                                           PLARGE_INTEGER LocalTime )
 702 {
 703     time_t gmt;
 704     int bias, daylight;
 705
 706     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 707
 708     gmt = time(NULL);
 709     bias = TIME_GetBias(gmt, &daylight);
 710
 711     LocalTime->QuadPart = SystemTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 712     return STATUS_SUCCESS;
 713 }
 714
 715 /******************************************************************************
 716  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 717  *
 718  * Convert a time into a count of seconds since 1970.
 719  *
 720  * PARAMS
 721  *   Time    [I] Time to convert.
 722  *   Seconds [O] Destination for the converted time.
 723  *
 724  * RETURNS
 725  *   Success: TRUE.
 726  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 727  */
 728 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 729 {
 730     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 731     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 732     tmp -= SECS_1601_TO_1970;
 733     if (tmp > 0xffffffff) return FALSE;
 734     *Seconds = (DWORD)tmp;
 735     return TRUE;
 736 }
 737
 738 /******************************************************************************
 739  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 740  *
 741  * Convert a time into a count of seconds since 1980.
 742  *
 743  * PARAMS
 744  *   Time    [I] Time to convert.
 745  *   Seconds [O] Destination for the converted time.
 746  *
 747  * RETURNS
 748  *   Success: TRUE.
 749  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 750  */
 751 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 752 {
 753     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 754     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 755     tmp -= SECS_1601_TO_1980;
 756     if (tmp > 0xffffffff) return FALSE;
 757     *Seconds = (DWORD)tmp;
 758     return TRUE;
 759 }
 760
 761 /******************************************************************************
 762  *       RtlSecondsSince1970ToTime [NTDLL.@]
 763  *
 764  * Convert a count of seconds since 1970 to a time.
 765  *
 766  * PARAMS
 767  *   Seconds [I] Time to convert.
 768  *   Time    [O] Destination for the converted time.
 769  *
 770  * RETURNS
 771  *   Nothing.
 772  */
 773 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 774 {
 775     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 776     Time->u.LowPart  = (DWORD)secs;
 777     Time->u.HighPart = (DWORD)(secs >> 32);
 778 }
 779
 780 /******************************************************************************
 781  *       RtlSecondsSince1980ToTime [NTDLL.@]
 782  *
 783  * Convert a count of seconds since 1980 to a time.
 784  *
 785  * PARAMS
 786  *   Seconds [I] Time to convert.
 787  *   Time    [O] Destination for the converted time.
 788  *
 789  * RETURNS
 790  *   Nothing.
 791  */
 792 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 793 {
 794     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 795     Time->u.LowPart  = (DWORD)secs;
 796     Time->u.HighPart = (DWORD)(secs >> 32);
 797 }
 798
 799 /******************************************************************************
 800  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 801  *
 802  * Convert a time to a count of elapsed seconds.
 803  *
 804  * PARAMS
 805  *   Time       [I] Time to convert.
 806  *   TimeFields [O] Destination for the converted time.
 807  *
 808  * RETURNS
 809  *   Nothing.
 810  */
 811 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 812 {
 813     LONGLONG time;
 814     INT rem;
 815
 816     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 817     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 818
 819     /* time is now in seconds */
 820     TimeFields->Year  = 0;
 821     TimeFields->Month = 0;
 822     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 823
 824     /* rem is now the remaining seconds in the last day */
 825     TimeFields->Second = rem % 60;
 826     rem /= 60;
 827     TimeFields->Minute = rem % 60;
 828     TimeFields->Hour = rem / 60;
 829 }
 830
 831 /***********************************************************************
 832  *       NtQuerySystemTime [NTDLL.@]
 833  *       ZwQuerySystemTime [NTDLL.@]
 834  *
 835  * Get the current system time.
 836  *
 837  * PARAMS
 838  *   Time [O] Destination for the current system time.
 839  *
 840  * RETURNS
 841  *   Success: STATUS_SUCCESS.
 842  *   Failure: An NTSTATUS error code indicating the problem.
 843  */
 844 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 845 {
 846     struct timeval now;
 847
 848     gettimeofday( &now, 0 );
 849     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 850     Time->QuadPart += now.tv_usec * 10;
 851     return STATUS_SUCCESS;
 852 }
 853
 854 /******************************************************************************
 855  *  NtQueryPerformanceCounter   [NTDLL.@]
 856  *
 857  *  Note: Windows uses a timer clocked at a multiple of 1193182 Hz. There is a
 858  *  good number of applications that crash when the returned frequency is either
 859  *  lower or higher then what Windows gives. Also too high counter values are
 860  *  reported to give problems.
 861  */
 862 NTSTATUS WINAPI NtQueryPerformanceCounter( PLARGE_INTEGER Counter, PLARGE_INTEGER Frequency )
 863 {
 864     struct timeval now;
 865
 866     if (!Counter) return STATUS_ACCESS_VIOLATION;
 867     gettimeofday( &now, 0 );
 868     /* convert a counter that increments at a rate of 1 MHz
 869      * to one of 1.193182 MHz, with some care for arithmetic
 870      * overflow ( will not overflow for 5000 years ) and
 871      * good accuracy ( 105/88 = 1.19318182) */
 872     Counter->QuadPart = (((now.tv_sec - server_start_time) * (ULONGLONG)1000000 + now.tv_usec) * 105) / 88;
 873     if (Frequency) Frequency->QuadPart = 1193182;
 874     return STATUS_SUCCESS;
 875 }
 876
 877 /***********************************************************************
 878  *        TIME_GetTZAsStr [internal]
 879  *
 880  * Helper function that returns the given timezone as a string.
 881  *
 882  * PARAMS
 883  *   utc [I] The current utc time.
 884  *   bias [I] The bias of the current timezone.
 885  *   dst [I] ??
 886  *
 887  * RETURNS
 888  *   Timezone name.
 889  *
 890  * NOTES:
 891  *   This could be done with a hash table instead of merely iterating through a
 892  *   table, however with the small amount of entries (60 or so) I didn't think
 893  *   it was worth it.
 894  */
 895 static const WCHAR* TIME_GetTZAsStr (time_t utc, int bias, int dst)
 896 {
 897    char psTZName[7];
 898    struct tm *ptm = localtime(&utc);
 899    unsigned int i;
 900
 901    if (!strftime (psTZName, 7, "%Z", ptm))
 902       return (NULL);
 903
 904    for (i=0; i<(sizeof(TZ_INFO) / sizeof(struct tagTZ_INFO)); i++)
 905    {
 906       if ( strcmp(TZ_INFO[i].psTZFromUnix, psTZName) == 0 &&
 907            TZ_INFO[i].bias == bias &&
 908            TZ_INFO[i].dst == dst
 909          )
 910             return TZ_INFO[i].psTZWindows;
 911    }
 912    FIXME("Can't match system time zone name \"%s\", bias=%d and dst=%d "
 913          "to an entry in TZ_INFO. Please add appropriate entry to "
 914          "TZ_INFO and submit as patch to wine-patches\n",psTZName,bias,dst);
 915    return NULL;
 916 }
 917
 918 /***  TIME_GetTimeZoneInfoFromReg: helper for GetTimeZoneInformation ***/
 919
 920
 921 static int TIME_GetTimeZoneInfoFromReg(RTL_TIME_ZONE_INFORMATION *tzinfo)
 922 {
 923     BYTE buf[90];
 924     KEY_VALUE_PARTIAL_INFORMATION * KpInfo =
 925         (KEY_VALUE_PARTIAL_INFORMATION *) buf;
 926     HANDLE hkey;
 927     DWORD size;
 928     OBJECT_ATTRIBUTES attr;
 929     UNICODE_STRING nameW;
 930
 931     attr.Length = sizeof(attr);
 932     attr.RootDirectory = 0;
 933     attr.ObjectName = &nameW;
 934     attr.Attributes = 0;
 935     attr.SecurityDescriptor = NULL;
 936     attr.SecurityQualityOfService = NULL;
 937     RtlInitUnicodeString( &nameW, TZInformationKeyW);
 938     if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr )) {
 939
 940 #define GTZIFR_N( valkey, tofield) \
 941         RtlInitUnicodeString( &nameW, valkey );\
 942         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 943                     sizeof(buf), &size )) { \
 944             if( size >= (sizeof((tofield)) + \
 945                     offsetof(KEY_VALUE_PARTIAL_INFORMATION,Data))) { \
 946                 memcpy(&(tofield), \
 947                         KpInfo->Data, sizeof(tofield)); \
 948             } \
 949         }
 950 #define GTZIFR_S( valkey, tofield) \
 951         RtlInitUnicodeString( &nameW, valkey );\
 952         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 953                     sizeof(buf), &size )) { \
 954             size_t len = (strlenW( (WCHAR*)KpInfo->Data ) + 1) * sizeof(WCHAR); \
 955             if (len > sizeof(tofield)) len = sizeof(tofield); \
 956             memcpy( tofield, KpInfo->Data, len ); \
 957             tofield[(len/sizeof(WCHAR))-1] = 0; \
 958         }
 959
 960         GTZIFR_N( TZStandardStartW,  tzinfo->StandardDate)
 961         GTZIFR_N( TZDaylightStartW,  tzinfo->DaylightDate)
 962         GTZIFR_N( TZBiasW,          tzinfo->Bias)
 963         GTZIFR_N( TZStandardBiasW,  tzinfo->StandardBias)
 964         GTZIFR_N( TZDaylightBiasW,  tzinfo->DaylightBias)
 965         GTZIFR_S( TZStandardNameW, tzinfo->StandardName)
 966         GTZIFR_S( TZDaylightNameW, tzinfo->DaylightName)
 967
 968 #undef GTZIFR_N
 969 #undef GTZIFR_S
 970         NtClose( hkey );
 971         return 1;
 972     }
 973     return 0;
 974 }
 975
 976 /***********************************************************************
 977  *      RtlQueryTimeZoneInformation [NTDLL.@]
 978  *
 979  * Get information about the current timezone.
 980  *
 981  * PARAMS
 982  *   tzinfo [O] Destination for the retrieved timezone info.
 983  *
 984  * RETURNS
 985  *   Success: STATUS_SUCCESS.
 986  *   Failure: An NTSTATUS error code indicating the problem.
 987  */
 988 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *tzinfo)
 989 {
 990     time_t gmt;
 991     int bias, daylight;
 992     const WCHAR *psTZ;
 993
 994     memset(tzinfo, 0, sizeof(RTL_TIME_ZONE_INFORMATION));
 995
 996     if( !TIME_GetTimeZoneInfoFromReg(tzinfo)) {
 997
 998         gmt = time(NULL);
 999         bias = TIME_GetBias(gmt, &daylight);
1000
1001         tzinfo->Bias = -bias / 60;
1002         tzinfo->StandardBias = 0;
1003         tzinfo->DaylightBias = -60;
1004         tzinfo->StandardName[0]='\0';
1005         tzinfo->DaylightName[0]='\0';
1006         psTZ = TIME_GetTZAsStr (gmt, (-bias/60), daylight);
1007         if (psTZ) strcpyW( tzinfo->StandardName, psTZ );
1008         }
1009     return STATUS_SUCCESS;
1010 }
1011
1012 /***********************************************************************
1013  *       RtlSetTimeZoneInformation [NTDLL.@]
1014  *
1015  * Set the current time zone information.
1016  *
1017  * PARAMS
1018  *   tzinfo [I] Timezone information to set.
1019  *
1020  * RETURNS
1021  *   Success: STATUS_SUCCESS.
1022  *   Failure: An NTSTATUS error code indicating the problem.
1023  *
1024  * BUGS
1025  *   Uses the obsolete unix timezone structure and tz_dsttime member.
1026  */
1027 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
1028 {
1029 #ifdef HAVE_SETTIMEOFDAY
1030     struct timezone tz;
1031
1032     tz.tz_minuteswest = tzinfo->Bias;
1033 #ifdef DST_NONE
1034     tz.tz_dsttime = DST_NONE;
1035 #else
1036     tz.tz_dsttime = 0;
1037 #endif
1038     if(!settimeofday(NULL, &tz))
1039         return STATUS_SUCCESS;
1040 #endif
1041     return STATUS_PRIVILEGE_NOT_HELD;
1042 }
1043
1044 /***********************************************************************
1045  *        NtSetSystemTime [NTDLL.@]
1046  *        ZwSetSystemTime [NTDLL.@]
1047  *
1048  * Set the system time.
1049  *
1050  * PARAMS
1051  *   NewTime [I] The time to set.
1052  *   OldTime [O] Optional destination for the previous system time.
1053  *
1054  * RETURNS
1055  *   Success: STATUS_SUCCESS.
1056  *   Failure: An NTSTATUS error code indicating the problem.
1057  */
1058 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
1059 {
1060     TIME_FIELDS tf;
1061     struct timeval tv;
1062     struct timezone tz;
1063     struct tm t;
1064     time_t sec, oldsec;
1065     int dst, bias;
1066     int err;
1067
1068     /* Return the old time if necessary */
1069     if(OldTime)
1070         NtQuerySystemTime(OldTime);
1071
1072     RtlTimeToTimeFields(NewTime, &tf);
1073
1074     /* call gettimeofday to get the current timezone */
1075     gettimeofday(&tv, &tz);
1076     oldsec = tv.tv_sec;
1077     /* get delta local time from utc */
1078     bias = TIME_GetBias(oldsec, &dst);
1079
1080     /* get the number of seconds */
1081     t.tm_sec = tf.Second;
1082     t.tm_min = tf.Minute;
1083     t.tm_hour = tf.Hour;
1084     t.tm_mday = tf.Day;
1085     t.tm_mon = tf.Month - 1;
1086     t.tm_year = tf.Year - 1900;
1087     t.tm_isdst = dst;
1088     sec = mktime (&t);
1089     /* correct for timezone and daylight */
1090     sec += bias;
1091
1092     /* set the new time */
1093     tv.tv_sec = sec;
1094     tv.tv_usec = tf.Milliseconds * 1000;
1095
1096     /* error and sanity check*/
1097     if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
1098         err = 2;
1099     } else {
1100 #ifdef HAVE_SETTIMEOFDAY
1101         err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
1102         if(err == 0)
1103             return STATUS_SUCCESS;
1104 #else
1105         err = 1;
1106 #endif
1107     }
1108
1109     ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
1110             tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
1111             (long)(sec-oldsec),
1112             err == -1 ? "No Permission"
1113                       : sec == (time_t)-1 ? "" : "is too large." );
1114
1115     if(err == 2)
1116         return STATUS_INVALID_PARAMETER;
1117     else if(err == -1)
1118         return STATUS_PRIVILEGE_NOT_HELD;
1119     else
1120         return STATUS_NOT_IMPLEMENTED;
1121 }