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    {"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 };
 396
 397 #define TICKSPERSEC        10000000
 398 #define TICKSPERMSEC       10000
 399 #define SECSPERDAY         86400
 400 #define SECSPERHOUR        3600
 401 #define SECSPERMIN         60
 402 #define MINSPERHOUR        60
 403 #define HOURSPERDAY        24
 404 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
 405 #define DAYSPERWEEK        7
 406 #define EPOCHYEAR          1601
 407 #define DAYSPERNORMALYEAR  365
 408 #define DAYSPERLEAPYEAR    366
 409 #define MONSPERYEAR        12
 410 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
 411 #define DAYSPERNORMALCENTURY (365 * 100 + 24)
 412 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
 413
 414 /* 1601 to 1970 is 369 years plus 89 leap days */
 415 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
 416 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
 417 /* 1601 to 1980 is 379 years plus 91 leap days */
 418 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
 419 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
 420 /* max ticks that can be represented as Unix time */
 421 #define TICKS_1601_TO_UNIX_MAX ((SECS_1601_TO_1970 + INT_MAX) * TICKSPERSEC)
 422
 423
 424 static const int MonthLengths[2][MONSPERYEAR] =
 425 {
 426         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 427         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 428 };
 429
 430 static inline int IsLeapYear(int Year)
 431 {
 432         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
 433 }
 434
 435 /***********************************************************************
 436  *              NTDLL_get_server_timeout
 437  *
 438  * Convert a NTDLL timeout into a timeval struct to send to the server.
 439  */
 440 void NTDLL_get_server_timeout( abs_time_t *when, const LARGE_INTEGER *timeout )
 441 {
 442     UINT remainder;
 443
 444     if (!timeout)  /* infinite timeout */
 445     {
 446         when->sec = when->usec = 0;
 447     }
 448     else if (timeout->QuadPart <= 0)  /* relative timeout */
 449     {
 450         struct timeval tv;
 451
 452         if (-timeout->QuadPart > (LONGLONG)INT_MAX * TICKSPERSEC)
 453             when->sec = when->usec = INT_MAX;
 454         else
 455         {
 456             ULONG sec = RtlEnlargedUnsignedDivide( -timeout->QuadPart, TICKSPERSEC, &remainder );
 457             gettimeofday( &tv, 0 );
 458             when->sec = tv.tv_sec + sec;
 459             if ((when->usec = tv.tv_usec + (remainder / 10)) >= 1000000)
 460             {
 461                 when->usec -= 1000000;
 462                 when->sec++;
 463             }
 464             if (when->sec < tv.tv_sec)  /* overflow */
 465                 when->sec = when->usec = INT_MAX;
 466         }
 467     }
 468     else  /* absolute time */
 469     {
 470         if (timeout->QuadPart < TICKS_1601_TO_1970)
 471             when->sec = when->usec = 0;
 472         else if (timeout->QuadPart > TICKS_1601_TO_UNIX_MAX)
 473             when->sec = when->usec = INT_MAX;
 474         else
 475         {
 476             when->sec = RtlEnlargedUnsignedDivide( timeout->QuadPart - TICKS_1601_TO_1970,
 477                                                    TICKSPERSEC, &remainder );
 478             when->usec = remainder / 10;
 479         }
 480     }
 481 }
 482
 483
 484 /***********************************************************************
 485  *              NTDLL_from_server_timeout
 486  *
 487  * Convert a timeval struct from the server into an NTDLL timeout.
 488  */
 489 void NTDLL_from_server_timeout( LARGE_INTEGER *timeout, const abs_time_t *when )
 490 {
 491     timeout->QuadPart = when->sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 492     timeout->QuadPart += when->usec * 10;
 493 }
 494
 495
 496 /******************************************************************************
 497  *       RtlTimeToTimeFields [NTDLL.@]
 498  *
 499  * Convert a time into a TIME_FIELDS structure.
 500  *
 501  * PARAMS
 502  *   liTime     [I] Time to convert.
 503  *   TimeFields [O] Destination for the converted time.
 504  *
 505  * RETURNS
 506  *   Nothing.
 507  */
 508 VOID WINAPI RtlTimeToTimeFields(
 509         const LARGE_INTEGER *liTime,
 510         PTIME_FIELDS TimeFields)
 511 {
 512         int SecondsInDay;
 513         long int cleaps, years, yearday, months;
 514         long int Days;
 515         LONGLONG Time;
 516
 517         /* Extract millisecond from time and convert time into seconds */
 518         TimeFields->Milliseconds =
 519             (CSHORT) (( liTime->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
 520         Time = liTime->QuadPart / TICKSPERSEC;
 521
 522         /* The native version of RtlTimeToTimeFields does not take leap seconds
 523          * into account */
 524
 525         /* Split the time into days and seconds within the day */
 526         Days = Time / SECSPERDAY;
 527         SecondsInDay = Time % SECSPERDAY;
 528
 529         /* compute time of day */
 530         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 531         SecondsInDay = SecondsInDay % SECSPERHOUR;
 532         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 533         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 534
 535         /* compute day of week */
 536         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 537
 538         /* compute year, month and day of month. */
 539         cleaps=( 3 * ((4 * Days + 1227) / DAYSPERQUADRICENTENNIUM) + 3 ) / 4;
 540         Days += 28188 + cleaps;
 541         years = (20 * Days - 2442) / (5 * DAYSPERNORMALQUADRENNIUM);
 542         yearday = Days - (years * DAYSPERNORMALQUADRENNIUM)/4;
 543         months = (64 * yearday) / 1959;
 544         /* the result is based on a year starting on March.
 545          * To convert take 12 from Januari and Februari and
 546          * increase the year by one. */
 547         if( months < 14 ) {
 548             TimeFields->Month = months - 1;
 549             TimeFields->Year = years + 1524;
 550         } else {
 551             TimeFields->Month = months - 13;
 552             TimeFields->Year = years + 1525;
 553         }
 554         /* calculation of day of month is based on the wonderful
 555          * sequence of INT( n * 30.6): it reproduces the
 556          * 31-30-31-30-31-31 month lengths exactly for small n's */
 557         TimeFields->Day = yearday - (1959 * months) / 64 ;
 558         return;
 559 }
 560
 561 /******************************************************************************
 562  *       RtlTimeFieldsToTime [NTDLL.@]
 563  *
 564  * Convert a TIME_FIELDS structure into a time.
 565  *
 566  * PARAMS
 567  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 568  *   Time         [O] Destination for the converted time.
 569  *
 570  * RETURNS
 571  *   Success: TRUE.
 572  *   Failure: FALSE.
 573  */
 574 BOOLEAN WINAPI RtlTimeFieldsToTime(
 575         PTIME_FIELDS tfTimeFields,
 576         PLARGE_INTEGER Time)
 577 {
 578         int month, year, cleaps, day;
 579
 580         /* FIXME: normalize the TIME_FIELDS structure here */
 581         /* No, native just returns 0 (error) if the fields are not */
 582         if( tfTimeFields->Milliseconds< 0 || tfTimeFields->Milliseconds > 999 ||
 583                 tfTimeFields->Second < 0 || tfTimeFields->Second > 59 ||
 584                 tfTimeFields->Minute < 0 || tfTimeFields->Minute > 59 ||
 585                 tfTimeFields->Hour < 0 || tfTimeFields->Hour > 23 ||
 586                 tfTimeFields->Month < 1 || tfTimeFields->Month > 12 ||
 587                 tfTimeFields->Day < 1 ||
 588                 tfTimeFields->Day > MonthLengths
 589                     [ tfTimeFields->Month ==2 || IsLeapYear(tfTimeFields->Year)]
 590                     [ tfTimeFields->Month - 1] ||
 591                 tfTimeFields->Year < 1601 )
 592             return FALSE;
 593
 594         /* now calculate a day count from the date
 595          * First start counting years from March. This way the leap days
 596          * are added at the end of the year, not somewhere in the middle.
 597          * Formula's become so much less complicate that way.
 598          * To convert: add 12 to the month numbers of Jan and Feb, and
 599          * take 1 from the year */
 600         if(tfTimeFields->Month < 3) {
 601             month = tfTimeFields->Month + 13;
 602             year = tfTimeFields->Year - 1;
 603         } else {
 604             month = tfTimeFields->Month + 1;
 605             year = tfTimeFields->Year;
 606         }
 607         cleaps = (3 * (year / 100) + 3) / 4;   /* nr of "century leap years"*/
 608         day =  (36525 * year) / 100 - cleaps + /* year * dayperyr, corrected */
 609                  (1959 * month) / 64 +         /* months * daypermonth */
 610                  tfTimeFields->Day -          /* day of the month */
 611                  584817 ;                      /* zero that on 1601-01-01 */
 612         /* done */
 613
 614         Time->QuadPart = (((((LONGLONG) day * HOURSPERDAY +
 615             tfTimeFields->Hour) * MINSPERHOUR +
 616             tfTimeFields->Minute) * SECSPERMIN +
 617             tfTimeFields->Second ) * 1000 +
 618             tfTimeFields->Milliseconds ) * TICKSPERMSEC;
 619
 620         return TRUE;
 621 }
 622
 623 /***********************************************************************
 624  *       TIME_GetBias [internal]
 625  *
 626  * Helper function calculates delta local time from UTC.
 627  *
 628  * PARAMS
 629  *   utc [I] The current utc time.
 630  *   pdaylight [I] Local daylight.
 631  *
 632  * RETURNS
 633  *   The bias for the current timezone.
 634  */
 635 static int TIME_GetBias(time_t utc, int *pdaylight)
 636 {
 637     struct tm *ptm;
 638     static time_t last_utc;
 639     static int last_bias;
 640     static int last_daylight;
 641     int ret;
 642
 643     RtlEnterCriticalSection( &TIME_GetBias_section );
 644     if(utc == last_utc)
 645     {
 646         *pdaylight = last_daylight;
 647         ret = last_bias;
 648     } else
 649     {
 650         ptm = localtime(&utc);
 651         *pdaylight = last_daylight =
 652             ptm->tm_isdst; /* daylight for local timezone */
 653         ptm = gmtime(&utc);
 654         ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
 655         last_utc = utc;
 656         ret = last_bias = (int)(utc-mktime(ptm));
 657     }
 658     RtlLeaveCriticalSection( &TIME_GetBias_section );
 659     return ret;
 660 }
 661
 662 /******************************************************************************
 663  *        RtlLocalTimeToSystemTime [NTDLL.@]
 664  *
 665  * Convert a local time into system time.
 666  *
 667  * PARAMS
 668  *   LocalTime  [I] Local time to convert.
 669  *   SystemTime [O] Destination for the converted time.
 670  *
 671  * RETURNS
 672  *   Success: STATUS_SUCCESS.
 673  *   Failure: An NTSTATUS error code indicating the problem.
 674  */
 675 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 676                                           PLARGE_INTEGER SystemTime)
 677 {
 678     time_t gmt;
 679     int bias, daylight;
 680
 681     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 682
 683     gmt = time(NULL);
 684     bias = TIME_GetBias(gmt, &daylight);
 685
 686     SystemTime->QuadPart = LocalTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 687     return STATUS_SUCCESS;
 688 }
 689
 690 /******************************************************************************
 691  *       RtlSystemTimeToLocalTime [NTDLL.@]
 692  *
 693  * Convert a system time into a local time.
 694  *
 695  * PARAMS
 696  *   SystemTime [I] System time to convert.
 697  *   LocalTime  [O] Destination for the converted time.
 698  *
 699  * RETURNS
 700  *   Success: STATUS_SUCCESS.
 701  *   Failure: An NTSTATUS error code indicating the problem.
 702  */
 703 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 704                                           PLARGE_INTEGER LocalTime )
 705 {
 706     time_t gmt;
 707     int bias, daylight;
 708
 709     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 710
 711     gmt = time(NULL);
 712     bias = TIME_GetBias(gmt, &daylight);
 713
 714     LocalTime->QuadPart = SystemTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 715     return STATUS_SUCCESS;
 716 }
 717
 718 /******************************************************************************
 719  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 720  *
 721  * Convert a time into a count of seconds since 1970.
 722  *
 723  * PARAMS
 724  *   Time    [I] Time to convert.
 725  *   Seconds [O] Destination for the converted time.
 726  *
 727  * RETURNS
 728  *   Success: TRUE.
 729  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 730  */
 731 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 732 {
 733     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 734     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 735     tmp -= SECS_1601_TO_1970;
 736     if (tmp > 0xffffffff) return FALSE;
 737     *Seconds = (DWORD)tmp;
 738     return TRUE;
 739 }
 740
 741 /******************************************************************************
 742  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 743  *
 744  * Convert a time into a count of seconds since 1980.
 745  *
 746  * PARAMS
 747  *   Time    [I] Time to convert.
 748  *   Seconds [O] Destination for the converted time.
 749  *
 750  * RETURNS
 751  *   Success: TRUE.
 752  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 753  */
 754 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 755 {
 756     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 757     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 758     tmp -= SECS_1601_TO_1980;
 759     if (tmp > 0xffffffff) return FALSE;
 760     *Seconds = (DWORD)tmp;
 761     return TRUE;
 762 }
 763
 764 /******************************************************************************
 765  *       RtlSecondsSince1970ToTime [NTDLL.@]
 766  *
 767  * Convert a count of seconds since 1970 to a time.
 768  *
 769  * PARAMS
 770  *   Seconds [I] Time to convert.
 771  *   Time    [O] Destination for the converted time.
 772  *
 773  * RETURNS
 774  *   Nothing.
 775  */
 776 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 777 {
 778     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 779     Time->u.LowPart  = (DWORD)secs;
 780     Time->u.HighPart = (DWORD)(secs >> 32);
 781 }
 782
 783 /******************************************************************************
 784  *       RtlSecondsSince1980ToTime [NTDLL.@]
 785  *
 786  * Convert a count of seconds since 1980 to a time.
 787  *
 788  * PARAMS
 789  *   Seconds [I] Time to convert.
 790  *   Time    [O] Destination for the converted time.
 791  *
 792  * RETURNS
 793  *   Nothing.
 794  */
 795 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 796 {
 797     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 798     Time->u.LowPart  = (DWORD)secs;
 799     Time->u.HighPart = (DWORD)(secs >> 32);
 800 }
 801
 802 /******************************************************************************
 803  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 804  *
 805  * Convert a time to a count of elapsed seconds.
 806  *
 807  * PARAMS
 808  *   Time       [I] Time to convert.
 809  *   TimeFields [O] Destination for the converted time.
 810  *
 811  * RETURNS
 812  *   Nothing.
 813  */
 814 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 815 {
 816     LONGLONG time;
 817     INT rem;
 818
 819     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 820     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 821
 822     /* time is now in seconds */
 823     TimeFields->Year  = 0;
 824     TimeFields->Month = 0;
 825     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 826
 827     /* rem is now the remaining seconds in the last day */
 828     TimeFields->Second = rem % 60;
 829     rem /= 60;
 830     TimeFields->Minute = rem % 60;
 831     TimeFields->Hour = rem / 60;
 832 }
 833
 834 /***********************************************************************
 835  *       NtQuerySystemTime [NTDLL.@]
 836  *       ZwQuerySystemTime [NTDLL.@]
 837  *
 838  * Get the current system time.
 839  *
 840  * PARAMS
 841  *   Time [O] Destination for the current system time.
 842  *
 843  * RETURNS
 844  *   Success: STATUS_SUCCESS.
 845  *   Failure: An NTSTATUS error code indicating the problem.
 846  */
 847 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 848 {
 849     struct timeval now;
 850
 851     gettimeofday( &now, 0 );
 852     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 853     Time->QuadPart += now.tv_usec * 10;
 854     return STATUS_SUCCESS;
 855 }
 856
 857 /******************************************************************************
 858  *  NtQueryPerformanceCounter   [NTDLL.@]
 859  *
 860  *  Note: Windows uses a timer clocked at a multiple of 1193182 Hz. There is a
 861  *  good number of applications that crash when the returned frequency is either
 862  *  lower or higher then what Windows gives. Also too high counter values are
 863  *  reported to give problems.
 864  */
 865 NTSTATUS WINAPI NtQueryPerformanceCounter( PLARGE_INTEGER Counter, PLARGE_INTEGER Frequency )
 866 {
 867     struct timeval now;
 868
 869     if (!Counter) return STATUS_ACCESS_VIOLATION;
 870     gettimeofday( &now, 0 );
 871     /* convert a counter that increments at a rate of 1 MHz
 872      * to one of 1.193182 MHz, with some care for arithmetic
 873      * overflow ( will not overflow for 5000 years ) and
 874      * good accuracy ( 105/88 = 1.19318182) */
 875     Counter->QuadPart = (((now.tv_sec - server_start_time) * (ULONGLONG)1000000 + now.tv_usec) * 105) / 88;
 876     if (Frequency) Frequency->QuadPart = 1193182;
 877     return STATUS_SUCCESS;
 878 }
 879
 880 /***********************************************************************
 881  *        TIME_GetTZAsStr [internal]
 882  *
 883  * Helper function that returns the given timezone as a string.
 884  *
 885  * PARAMS
 886  *   utc [I] The current utc time.
 887  *   bias [I] The bias of the current timezone.
 888  *   dst [I] ??
 889  *
 890  * RETURNS
 891  *   Timezone name.
 892  *
 893  * NOTES:
 894  *   This could be done with a hash table instead of merely iterating through a
 895  *   table, however with the small amount of entries (60 or so) I didn't think
 896  *   it was worth it.
 897  */
 898 static const WCHAR* TIME_GetTZAsStr (time_t utc, int bias, int dst)
 899 {
 900    char psTZName[7];
 901    struct tm *ptm = localtime(&utc);
 902    unsigned int i;
 903
 904    if (!strftime (psTZName, 7, "%Z", ptm))
 905       return (NULL);
 906
 907    for (i=0; i<(sizeof(TZ_INFO) / sizeof(struct tagTZ_INFO)); i++)
 908    {
 909       if ( strcmp(TZ_INFO[i].psTZFromUnix, psTZName) == 0 &&
 910            TZ_INFO[i].bias == bias &&
 911            TZ_INFO[i].dst == dst
 912          )
 913             return TZ_INFO[i].psTZWindows;
 914    }
 915    FIXME("Can't match system time zone name \"%s\", bias=%d and dst=%d "
 916          "to an entry in TZ_INFO. Please add appropriate entry to "
 917          "TZ_INFO and submit as patch to wine-patches\n",psTZName,bias,dst);
 918    return NULL;
 919 }
 920
 921 /***  TIME_GetTimeZoneInfoFromReg: helper for GetTimeZoneInformation ***/
 922
 923
 924 static int TIME_GetTimeZoneInfoFromReg(RTL_TIME_ZONE_INFORMATION *tzinfo)
 925 {
 926     BYTE buf[90];
 927     KEY_VALUE_PARTIAL_INFORMATION * KpInfo =
 928         (KEY_VALUE_PARTIAL_INFORMATION *) buf;
 929     HANDLE hkey;
 930     DWORD size;
 931     OBJECT_ATTRIBUTES attr;
 932     UNICODE_STRING nameW;
 933
 934     attr.Length = sizeof(attr);
 935     attr.RootDirectory = 0;
 936     attr.ObjectName = &nameW;
 937     attr.Attributes = 0;
 938     attr.SecurityDescriptor = NULL;
 939     attr.SecurityQualityOfService = NULL;
 940     RtlInitUnicodeString( &nameW, TZInformationKeyW);
 941     if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr )) {
 942
 943 #define GTZIFR_N( valkey, tofield) \
 944         RtlInitUnicodeString( &nameW, valkey );\
 945         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 946                     sizeof(buf), &size )) { \
 947             if( size >= (sizeof((tofield)) + \
 948                     offsetof(KEY_VALUE_PARTIAL_INFORMATION,Data))) { \
 949                 memcpy(&(tofield), \
 950                         KpInfo->Data, sizeof(tofield)); \
 951             } \
 952         }
 953 #define GTZIFR_S( valkey, tofield) \
 954         RtlInitUnicodeString( &nameW, valkey );\
 955         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 956                     sizeof(buf), &size )) { \
 957             size_t len = (strlenW( (WCHAR*)KpInfo->Data ) + 1) * sizeof(WCHAR); \
 958             if (len > sizeof(tofield)) len = sizeof(tofield); \
 959             memcpy( tofield, KpInfo->Data, len ); \
 960             tofield[(len/sizeof(WCHAR))-1] = 0; \
 961         }
 962
 963         GTZIFR_N( TZStandardStartW,  tzinfo->StandardDate)
 964         GTZIFR_N( TZDaylightStartW,  tzinfo->DaylightDate)
 965         GTZIFR_N( TZBiasW,          tzinfo->Bias)
 966         GTZIFR_N( TZStandardBiasW,  tzinfo->StandardBias)
 967         GTZIFR_N( TZDaylightBiasW,  tzinfo->DaylightBias)
 968         GTZIFR_S( TZStandardNameW, tzinfo->StandardName)
 969         GTZIFR_S( TZDaylightNameW, tzinfo->DaylightName)
 970
 971 #undef GTZIFR_N
 972 #undef GTZIFR_S
 973         NtClose( hkey );
 974         return 1;
 975     }
 976     return 0;
 977 }
 978
 979 /***********************************************************************
 980  *      RtlQueryTimeZoneInformation [NTDLL.@]
 981  *
 982  * Get information about the current timezone.
 983  *
 984  * PARAMS
 985  *   tzinfo [O] Destination for the retrieved timezone info.
 986  *
 987  * RETURNS
 988  *   Success: STATUS_SUCCESS.
 989  *   Failure: An NTSTATUS error code indicating the problem.
 990  */
 991 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *tzinfo)
 992 {
 993     time_t gmt;
 994     int bias, daylight;
 995     const WCHAR *psTZ;
 996
 997     memset(tzinfo, 0, sizeof(RTL_TIME_ZONE_INFORMATION));
 998
 999     if( !TIME_GetTimeZoneInfoFromReg(tzinfo)) {
1000
1001         gmt = time(NULL);
1002         bias = TIME_GetBias(gmt, &daylight);
1003
1004         tzinfo->Bias = -bias / 60;
1005         tzinfo->StandardBias = 0;
1006         tzinfo->DaylightBias = -60;
1007         tzinfo->StandardName[0]='\0';
1008         tzinfo->DaylightName[0]='\0';
1009         psTZ = TIME_GetTZAsStr (gmt, (-bias/60), daylight);
1010         if (psTZ) strcpyW( tzinfo->StandardName, psTZ );
1011         }
1012     return STATUS_SUCCESS;
1013 }
1014
1015 /***********************************************************************
1016  *       RtlSetTimeZoneInformation [NTDLL.@]
1017  *
1018  * Set the current time zone information.
1019  *
1020  * PARAMS
1021  *   tzinfo [I] Timezone information to set.
1022  *
1023  * RETURNS
1024  *   Success: STATUS_SUCCESS.
1025  *   Failure: An NTSTATUS error code indicating the problem.
1026  *
1027  * BUGS
1028  *   Uses the obsolete unix timezone structure and tz_dsttime member.
1029  */
1030 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
1031 {
1032 #ifdef HAVE_SETTIMEOFDAY
1033     struct timezone tz;
1034
1035     tz.tz_minuteswest = tzinfo->Bias;
1036 #ifdef DST_NONE
1037     tz.tz_dsttime = DST_NONE;
1038 #else
1039     tz.tz_dsttime = 0;
1040 #endif
1041     if(!settimeofday(NULL, &tz))
1042         return STATUS_SUCCESS;
1043 #endif
1044     return STATUS_PRIVILEGE_NOT_HELD;
1045 }
1046
1047 /***********************************************************************
1048  *        NtSetSystemTime [NTDLL.@]
1049  *        ZwSetSystemTime [NTDLL.@]
1050  *
1051  * Set the system time.
1052  *
1053  * PARAMS
1054  *   NewTime [I] The time to set.
1055  *   OldTime [O] Optional destination for the previous system time.
1056  *
1057  * RETURNS
1058  *   Success: STATUS_SUCCESS.
1059  *   Failure: An NTSTATUS error code indicating the problem.
1060  */
1061 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
1062 {
1063     TIME_FIELDS tf;
1064     struct timeval tv;
1065     struct timezone tz;
1066     struct tm t;
1067     time_t sec, oldsec;
1068     int dst, bias;
1069     int err;
1070
1071     /* Return the old time if necessary */
1072     if(OldTime)
1073         NtQuerySystemTime(OldTime);
1074
1075     RtlTimeToTimeFields(NewTime, &tf);
1076
1077     /* call gettimeofday to get the current timezone */
1078     gettimeofday(&tv, &tz);
1079     oldsec = tv.tv_sec;
1080     /* get delta local time from utc */
1081     bias = TIME_GetBias(oldsec, &dst);
1082
1083     /* get the number of seconds */
1084     t.tm_sec = tf.Second;
1085     t.tm_min = tf.Minute;
1086     t.tm_hour = tf.Hour;
1087     t.tm_mday = tf.Day;
1088     t.tm_mon = tf.Month - 1;
1089     t.tm_year = tf.Year - 1900;
1090     t.tm_isdst = dst;
1091     sec = mktime (&t);
1092     /* correct for timezone and daylight */
1093     sec += bias;
1094
1095     /* set the new time */
1096     tv.tv_sec = sec;
1097     tv.tv_usec = tf.Milliseconds * 1000;
1098
1099     /* error and sanity check*/
1100     if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
1101         err = 2;
1102     } else {
1103 #ifdef HAVE_SETTIMEOFDAY
1104         err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
1105         if(err == 0)
1106             return STATUS_SUCCESS;
1107 #else
1108         err = 1;
1109 #endif
1110     }
1111
1112     ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
1113             tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
1114             (long)(sec-oldsec),
1115             err == -1 ? "No Permission"
1116                       : sec == (time_t)-1 ? "" : "is too large." );
1117
1118     if(err == 2)
1119         return STATUS_INVALID_PARAMETER;
1120     else if(err == -1)
1121         return STATUS_PRIVILEGE_NOT_HELD;
1122     else
1123         return STATUS_NOT_IMPLEMENTED;
1124 }