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    {"IDT",
 237     {'I','s','r','a','e','l',' ','S','t','a','n','d','a','r','d',' ','T','i',
 238      'm','e','\0'}, -180, 1},
 239    {"MSK",
 240     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 241      'i','m','e','\0'}, -180, 0},
 242    {"ADT",
 243     {'A','r','a','b','i','c',' ','S','t','a','n','d','a','r','d',' ','T','i',
 244      'm','e','\0'}, -240, 1},
 245    {"AST",
 246     {'A','r','a','b',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 247      '\0'}, -180, 0},
 248    {"MSD",
 249     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 250      'i','m','e','\0'}, -240, 1},
 251    {"EAT",
 252     {'E','.',' ','A','f','r','i','c','a',' ','S','t','a','n','d','a','r','d',
 253      ' ','T','i','m','e','\0'}, -180, 0},
 254    {"IRST",
 255     {'I','r','a','n',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 256      0},-210, 0 },
 257    {"IRST",
 258     {'I','r','a','n',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 259      '\0'}, -270, 1},
 260    {"GST",
 261     {'A','r','a','b','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 262      'i','m','e','\0'}, -240, 0},
 263    {"AZT",
 264     {'C','a','u','c','a','s','u','s',' ','S','t','a','n','d','a','r','d',' ',
 265      'T','i','m','e',0}, -240, 0 },
 266    {"AZST",
 267     {'C','a','u','c','a','s','u','s',' ','S','t','a','n','d','a','r','d',' ',
 268      'T','i','m','e','\0'}, -300, 1},
 269    {"AFT",
 270     {'A','f','g','h','a','n','i','s','t','a','n',' ','S','t','a','n','d','a',
 271      'r','d',' ','T','i','m','e','\0'}, -270, 0},
 272    {"SAMT",
 273     {'S','a','m','a','r','a',' ','S','t','a','n','d','a','r','d',' ','T','i',
 274      'm','e','\0'}, -270, 1},
 275    {"YEKT",
 276     {'U','r','a','l','s',' ','S','t','a','n','d','a','r','d',
 277      ' ','T','i','m','e',' ','(','W','i','n','t','e','r',')','\0'}, -300, 0},
 278    {"YEKST",
 279     {'U','r','a','l','s',' ','D','a','y','l','i','g','h','t',
 280      ' ','T','i','m','e',' ','(','S','u','m','m','e','r',')','\0'}, -360, 1},
 281    {"OMST",
 282     {'O','m','s','k',' ','S','t','a','n','d','a','r','d',
 283      ' ','T','i','m','e',' ','(','W','i','n','t','e','r',')','\0'}, -360, 0},
 284    {"OMSST",
 285     {'O','m','s','k',' ','D','a','y','l','i','g','h','t',
 286      ' ','T','i','m','e',' ','(','S','u','m','m','e','r',')','\0'}, -420, 1},
 287    {"PKT",
 288     {'W','e','s','t',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',
 289      ' ','T','i','m','e','\0'}, -300, 0},
 290    {"IST",
 291     {'I','n','d','i','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 292      'e','\0'}, -330, 0},
 293    {"NPT",
 294     {'N','e','p','a','l',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 295      'e','\0'}, -345, 0},
 296    {"ALMST",
 297     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 298      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -420, 1},
 299    {"BDT",
 300     {'C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t','a','n','d',
 301      'a','r','d',' ','T','i','m','e','\0'}, -360, 0},
 302    {"LKT",
 303     {'S','r','i',' ','L','a','n','k','a',' ','S','t','a','n','d','a','r','d',
 304      ' ','T','i','m','e','\0'}, -360, 0},
 305    {"MMT",
 306     {'M','y','a','n','m','a','r',' ','S','t','a','n','d','a','r','d',' ','T',
 307      'i','m','e','\0'}, -390, 0},
 308    {"ICT",
 309     {'S','E',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',' ','T',
 310      'i','m','e','\0'}, -420, 0},
 311    {"KRAT",
 312     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 313      'd',' ','T','i','m','e',0}, -420, 0},
 314    {"KRAST",
 315     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 316      'd',' ','T','i','m','e','\0'}, -480, 1},
 317    {"IRKT",
 318     {'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
 319      'a','n','d','a','r','d',' ','T','i','m','e',0}, -480, 0},
 320    {"CST",
 321     {'C','h','i','n','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 322      'e','\0'}, -480, 0},
 323    {"IRKST",
 324     {'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
 325      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -540, 1},
 326    {"SGT",
 327     {'M','a','l','a','y',' ','P','e','n','i','n','s','u','l','a',' ','S','t',
 328      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 329    {"WST",
 330     {'W','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 331      'a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 332    {"WST",
 333     {'W','.',' ','A','u','s','t','r','a','l','i','a',' ','S','u','m','m','e',
 334      'r',' ','T','i','m','e','\0'}, -540, 1},
 335    {"JST",
 336     {'T','o','k','y','o',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 337      'e','\0'}, -540, 0},
 338    {"KST",
 339     {'K','o','r','e','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 340      'e','\0'}, -540, 0},
 341    {"YAKST",
 342     {'Y','a','k','u','t','s','k',' ','S','t','a','n','d','a','r','d',' ','T',
 343      'i','m','e','\0'}, -600, 1},
 344    {"CST",
 345     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a',
 346      'n','d','a','r','d',' ','T','i','m','e','\0'}, -570, 0},
 347    {"CST",
 348     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','D','a','y',
 349      'l','i','g','h','t',' ','T','i','m','e','\0'}, -630, 1},
 350    {"EST",
 351     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 352      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 353    {"EST",
 354     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 355      'a','r','d',' ','T','i','m','e','\0'}, -660, 1},
 356    {"GST",
 357     {'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
 358      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 359    {"VLAT",
 360     {'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
 361      'r','d',' ','T','i','m','e',0}, -600, 0 },
 362    {"ChST",
 363     {'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
 364      'a','r','d',' ','T','i','m','e',0}, -600, 0},
 365    {"VLAST",
 366     {'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
 367      'r','d',' ','T','i','m','e','\0'}, -660, 1},
 368    {"MAGT",
 369     {'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
 370      'a','n','d','a','r','d',' ','T','i','m','e',0}, -660, 0},
 371    {"MAGST",
 372     {'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
 373      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -720, 1},
 374    {"NZST",
 375     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','S','t','a','n','d','a',
 376      'r','d',' ','T','i','m','e','\0'}, -720, 0},
 377    {"NZDT",
 378     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','D','a','y','l','i','g',
 379      'h','t',' ','T','i','m','e','\0'}, -780, 1},
 380    {"FJT",
 381     {'F','i','j','i',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 382      '\0'}, -720, 0},
 383    {"TOT",
 384     {'T','o','n','g','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 385      'e','\0'}, -780, 0},
 386    {"NOVT",
 387     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 388      'a','n','d','a','r','d',' ','T','i','m','e',0 }, -360, 0},
 389    {"NOVT",
 390     {'N','o','v','o','s','i','b','i','r','s','k',' ','S','t','a','n','d','a',
 391      'r','d',' ','T','i','m','e','\0'}, -360, 1},
 392    {"ANAT",
 393     {'A','n','a','d','y','r',' ','S','t','a','n','d','a','r','d',' ','T','i',
 394      'm','e','\0'}, -720, 1},
 395    {"HKT",
 396     {'H','o','n','g',' ','K','o','n','g',' ','S','t','a','n','d','a','r','d',
 397      ' ','T','i','m','e','\0'}, -480, 0},
 398    {"UYT",
 399     {'U','r','u','g','u','a','y','a','n',' ','T','i','m','e','\0'}, 180, 0},
 400    {"UYST",
 401     {'U','r','u','g','u','a','y','a','n',' ','S','u','m','m','e','r',' ','T',
 402     'i','m','e','\0'}, 120, 1},
 403    {"MYT",
 404     {'M','a','l','a','y','s','i','a','n',' ','T','i','m','e','\0'}, -480, 0},
 405    {"PHT",
 406     {'P','h','i','l','i','p','p','i','n','e',' ','T','i','m','e','\0'}, -480, 0},
 407    {"NOVST",
 408     {'N','o','v','o','s','i','b','i','r','s','k',' ','S','u','m','m','e','r',
 409      ' ','T','i','m','e','\0'}, -420, 1},
 410    {"UZT",
 411     {'U','z','b','e','k','i','s','t','h','a','n',' ','T','i','m','e','\0'}, -300, 0}
 412 };
 413
 414 #define TICKSPERSEC        10000000
 415 #define TICKSPERMSEC       10000
 416 #define SECSPERDAY         86400
 417 #define SECSPERHOUR        3600
 418 #define SECSPERMIN         60
 419 #define MINSPERHOUR        60
 420 #define HOURSPERDAY        24
 421 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
 422 #define DAYSPERWEEK        7
 423 #define EPOCHYEAR          1601
 424 #define DAYSPERNORMALYEAR  365
 425 #define DAYSPERLEAPYEAR    366
 426 #define MONSPERYEAR        12
 427 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
 428 #define DAYSPERNORMALCENTURY (365 * 100 + 24)
 429 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
 430
 431 /* 1601 to 1970 is 369 years plus 89 leap days */
 432 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
 433 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
 434 /* 1601 to 1980 is 379 years plus 91 leap days */
 435 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
 436 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
 437 /* max ticks that can be represented as Unix time */
 438 #define TICKS_1601_TO_UNIX_MAX ((SECS_1601_TO_1970 + INT_MAX) * TICKSPERSEC)
 439
 440
 441 static const int MonthLengths[2][MONSPERYEAR] =
 442 {
 443         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 444         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 445 };
 446
 447 static inline int IsLeapYear(int Year)
 448 {
 449         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
 450 }
 451
 452 /******************************************************************************
 453  *       RtlTimeToTimeFields [NTDLL.@]
 454  *
 455  * Convert a time into a TIME_FIELDS structure.
 456  *
 457  * PARAMS
 458  *   liTime     [I] Time to convert.
 459  *   TimeFields [O] Destination for the converted time.
 460  *
 461  * RETURNS
 462  *   Nothing.
 463  */
 464 VOID WINAPI RtlTimeToTimeFields(
 465         const LARGE_INTEGER *liTime,
 466         PTIME_FIELDS TimeFields)
 467 {
 468         int SecondsInDay;
 469         long int cleaps, years, yearday, months;
 470         long int Days;
 471         LONGLONG Time;
 472
 473         /* Extract millisecond from time and convert time into seconds */
 474         TimeFields->Milliseconds =
 475             (CSHORT) (( liTime->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
 476         Time = liTime->QuadPart / TICKSPERSEC;
 477
 478         /* The native version of RtlTimeToTimeFields does not take leap seconds
 479          * into account */
 480
 481         /* Split the time into days and seconds within the day */
 482         Days = Time / SECSPERDAY;
 483         SecondsInDay = Time % SECSPERDAY;
 484
 485         /* compute time of day */
 486         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 487         SecondsInDay = SecondsInDay % SECSPERHOUR;
 488         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 489         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 490
 491         /* compute day of week */
 492         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 493
 494         /* compute year, month and day of month. */
 495         cleaps=( 3 * ((4 * Days + 1227) / DAYSPERQUADRICENTENNIUM) + 3 ) / 4;
 496         Days += 28188 + cleaps;
 497         years = (20 * Days - 2442) / (5 * DAYSPERNORMALQUADRENNIUM);
 498         yearday = Days - (years * DAYSPERNORMALQUADRENNIUM)/4;
 499         months = (64 * yearday) / 1959;
 500         /* the result is based on a year starting on March.
 501          * To convert take 12 from Januari and Februari and
 502          * increase the year by one. */
 503         if( months < 14 ) {
 504             TimeFields->Month = months - 1;
 505             TimeFields->Year = years + 1524;
 506         } else {
 507             TimeFields->Month = months - 13;
 508             TimeFields->Year = years + 1525;
 509         }
 510         /* calculation of day of month is based on the wonderful
 511          * sequence of INT( n * 30.6): it reproduces the
 512          * 31-30-31-30-31-31 month lengths exactly for small n's */
 513         TimeFields->Day = yearday - (1959 * months) / 64 ;
 514         return;
 515 }
 516
 517 /******************************************************************************
 518  *       RtlTimeFieldsToTime [NTDLL.@]
 519  *
 520  * Convert a TIME_FIELDS structure into a time.
 521  *
 522  * PARAMS
 523  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 524  *   Time         [O] Destination for the converted time.
 525  *
 526  * RETURNS
 527  *   Success: TRUE.
 528  *   Failure: FALSE.
 529  */
 530 BOOLEAN WINAPI RtlTimeFieldsToTime(
 531         PTIME_FIELDS tfTimeFields,
 532         PLARGE_INTEGER Time)
 533 {
 534         int month, year, cleaps, day;
 535
 536         /* FIXME: normalize the TIME_FIELDS structure here */
 537         /* No, native just returns 0 (error) if the fields are not */
 538         if( tfTimeFields->Milliseconds< 0 || tfTimeFields->Milliseconds > 999 ||
 539                 tfTimeFields->Second < 0 || tfTimeFields->Second > 59 ||
 540                 tfTimeFields->Minute < 0 || tfTimeFields->Minute > 59 ||
 541                 tfTimeFields->Hour < 0 || tfTimeFields->Hour > 23 ||
 542                 tfTimeFields->Month < 1 || tfTimeFields->Month > 12 ||
 543                 tfTimeFields->Day < 1 ||
 544                 tfTimeFields->Day > MonthLengths
 545                     [ tfTimeFields->Month ==2 || IsLeapYear(tfTimeFields->Year)]
 546                     [ tfTimeFields->Month - 1] ||
 547                 tfTimeFields->Year < 1601 )
 548             return FALSE;
 549
 550         /* now calculate a day count from the date
 551          * First start counting years from March. This way the leap days
 552          * are added at the end of the year, not somewhere in the middle.
 553          * Formula's become so much less complicate that way.
 554          * To convert: add 12 to the month numbers of Jan and Feb, and
 555          * take 1 from the year */
 556         if(tfTimeFields->Month < 3) {
 557             month = tfTimeFields->Month + 13;
 558             year = tfTimeFields->Year - 1;
 559         } else {
 560             month = tfTimeFields->Month + 1;
 561             year = tfTimeFields->Year;
 562         }
 563         cleaps = (3 * (year / 100) + 3) / 4;   /* nr of "century leap years"*/
 564         day =  (36525 * year) / 100 - cleaps + /* year * dayperyr, corrected */
 565                  (1959 * month) / 64 +         /* months * daypermonth */
 566                  tfTimeFields->Day -          /* day of the month */
 567                  584817 ;                      /* zero that on 1601-01-01 */
 568         /* done */
 569
 570         Time->QuadPart = (((((LONGLONG) day * HOURSPERDAY +
 571             tfTimeFields->Hour) * MINSPERHOUR +
 572             tfTimeFields->Minute) * SECSPERMIN +
 573             tfTimeFields->Second ) * 1000 +
 574             tfTimeFields->Milliseconds ) * TICKSPERMSEC;
 575
 576         return TRUE;
 577 }
 578
 579 /***********************************************************************
 580  *       TIME_GetBias [internal]
 581  *
 582  * Helper function calculates delta local time from UTC.
 583  *
 584  * PARAMS
 585  *   utc [I] The current utc time.
 586  *   pdaylight [I] Local daylight.
 587  *
 588  * RETURNS
 589  *   The bias for the current timezone.
 590  */
 591 static int TIME_GetBias(time_t utc, int *pdaylight)
 592 {
 593     struct tm *ptm;
 594     static time_t last_utc;
 595     static int last_bias;
 596     static int last_daylight;
 597     int ret;
 598
 599     RtlEnterCriticalSection( &TIME_GetBias_section );
 600     if(utc == last_utc)
 601     {
 602         *pdaylight = last_daylight;
 603         ret = last_bias;
 604     } else
 605     {
 606         ptm = localtime(&utc);
 607         *pdaylight = last_daylight =
 608             ptm->tm_isdst; /* daylight for local timezone */
 609         ptm = gmtime(&utc);
 610         ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
 611         last_utc = utc;
 612         ret = last_bias = (int)(utc-mktime(ptm));
 613     }
 614     RtlLeaveCriticalSection( &TIME_GetBias_section );
 615     return ret;
 616 }
 617
 618 /******************************************************************************
 619  *        RtlLocalTimeToSystemTime [NTDLL.@]
 620  *
 621  * Convert a local time into system time.
 622  *
 623  * PARAMS
 624  *   LocalTime  [I] Local time to convert.
 625  *   SystemTime [O] Destination for the converted time.
 626  *
 627  * RETURNS
 628  *   Success: STATUS_SUCCESS.
 629  *   Failure: An NTSTATUS error code indicating the problem.
 630  */
 631 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 632                                           PLARGE_INTEGER SystemTime)
 633 {
 634     time_t gmt;
 635     int bias, daylight;
 636
 637     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 638
 639     gmt = time(NULL);
 640     bias = TIME_GetBias(gmt, &daylight);
 641
 642     SystemTime->QuadPart = LocalTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 643     return STATUS_SUCCESS;
 644 }
 645
 646 /******************************************************************************
 647  *       RtlSystemTimeToLocalTime [NTDLL.@]
 648  *
 649  * Convert a system time into a local time.
 650  *
 651  * PARAMS
 652  *   SystemTime [I] System time to convert.
 653  *   LocalTime  [O] Destination for the converted time.
 654  *
 655  * RETURNS
 656  *   Success: STATUS_SUCCESS.
 657  *   Failure: An NTSTATUS error code indicating the problem.
 658  */
 659 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 660                                           PLARGE_INTEGER LocalTime )
 661 {
 662     time_t gmt;
 663     int bias, daylight;
 664
 665     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 666
 667     gmt = time(NULL);
 668     bias = TIME_GetBias(gmt, &daylight);
 669
 670     LocalTime->QuadPart = SystemTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 671     return STATUS_SUCCESS;
 672 }
 673
 674 /******************************************************************************
 675  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 676  *
 677  * Convert a time into a count of seconds since 1970.
 678  *
 679  * PARAMS
 680  *   Time    [I] Time to convert.
 681  *   Seconds [O] Destination for the converted time.
 682  *
 683  * RETURNS
 684  *   Success: TRUE.
 685  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 686  */
 687 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 688 {
 689     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 690     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 691     tmp -= SECS_1601_TO_1970;
 692     if (tmp > 0xffffffff) return FALSE;
 693     *Seconds = (DWORD)tmp;
 694     return TRUE;
 695 }
 696
 697 /******************************************************************************
 698  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 699  *
 700  * Convert a time into a count of seconds since 1980.
 701  *
 702  * PARAMS
 703  *   Time    [I] Time to convert.
 704  *   Seconds [O] Destination for the converted time.
 705  *
 706  * RETURNS
 707  *   Success: TRUE.
 708  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 709  */
 710 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 711 {
 712     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 713     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 714     tmp -= SECS_1601_TO_1980;
 715     if (tmp > 0xffffffff) return FALSE;
 716     *Seconds = (DWORD)tmp;
 717     return TRUE;
 718 }
 719
 720 /******************************************************************************
 721  *       RtlSecondsSince1970ToTime [NTDLL.@]
 722  *
 723  * Convert a count of seconds since 1970 to a time.
 724  *
 725  * PARAMS
 726  *   Seconds [I] Time to convert.
 727  *   Time    [O] Destination for the converted time.
 728  *
 729  * RETURNS
 730  *   Nothing.
 731  */
 732 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 733 {
 734     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 735     Time->u.LowPart  = (DWORD)secs;
 736     Time->u.HighPart = (DWORD)(secs >> 32);
 737 }
 738
 739 /******************************************************************************
 740  *       RtlSecondsSince1980ToTime [NTDLL.@]
 741  *
 742  * Convert a count of seconds since 1980 to a time.
 743  *
 744  * PARAMS
 745  *   Seconds [I] Time to convert.
 746  *   Time    [O] Destination for the converted time.
 747  *
 748  * RETURNS
 749  *   Nothing.
 750  */
 751 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 752 {
 753     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 754     Time->u.LowPart  = (DWORD)secs;
 755     Time->u.HighPart = (DWORD)(secs >> 32);
 756 }
 757
 758 /******************************************************************************
 759  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 760  *
 761  * Convert a time to a count of elapsed seconds.
 762  *
 763  * PARAMS
 764  *   Time       [I] Time to convert.
 765  *   TimeFields [O] Destination for the converted time.
 766  *
 767  * RETURNS
 768  *   Nothing.
 769  */
 770 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 771 {
 772     LONGLONG time;
 773     INT rem;
 774
 775     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 776     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 777
 778     /* time is now in seconds */
 779     TimeFields->Year  = 0;
 780     TimeFields->Month = 0;
 781     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 782
 783     /* rem is now the remaining seconds in the last day */
 784     TimeFields->Second = rem % 60;
 785     rem /= 60;
 786     TimeFields->Minute = rem % 60;
 787     TimeFields->Hour = rem / 60;
 788 }
 789
 790 /***********************************************************************
 791  *       NtQuerySystemTime [NTDLL.@]
 792  *       ZwQuerySystemTime [NTDLL.@]
 793  *
 794  * Get the current system time.
 795  *
 796  * PARAMS
 797  *   Time [O] Destination for the current system time.
 798  *
 799  * RETURNS
 800  *   Success: STATUS_SUCCESS.
 801  *   Failure: An NTSTATUS error code indicating the problem.
 802  */
 803 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 804 {
 805     struct timeval now;
 806
 807     gettimeofday( &now, 0 );
 808     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 809     Time->QuadPart += now.tv_usec * 10;
 810     return STATUS_SUCCESS;
 811 }
 812
 813 /******************************************************************************
 814  *  NtQueryPerformanceCounter   [NTDLL.@]
 815  *
 816  *  Note: Windows uses a timer clocked at a multiple of 1193182 Hz. There is a
 817  *  good number of applications that crash when the returned frequency is either
 818  *  lower or higher then what Windows gives. Also too high counter values are
 819  *  reported to give problems.
 820  */
 821 NTSTATUS WINAPI NtQueryPerformanceCounter( PLARGE_INTEGER Counter, PLARGE_INTEGER Frequency )
 822 {
 823     LARGE_INTEGER now;
 824
 825     if (!Counter) return STATUS_ACCESS_VIOLATION;
 826
 827     /* convert a counter that increments at a rate of 10 MHz
 828      * to one of 1.193182 MHz, with some care for arithmetic
 829      * overflow and good accuracy (21/176 = 0.11931818) */
 830     NtQuerySystemTime( &now );
 831     Counter->QuadPart = ((now.QuadPart - server_start_time) * 21) / 176;
 832     if (Frequency) Frequency->QuadPart = 1193182;
 833     return STATUS_SUCCESS;
 834 }
 835
 836
 837 /******************************************************************************
 838  * NtGetTickCount   (NTDLL.@)
 839  * ZwGetTickCount   (NTDLL.@)
 840  */
 841 ULONG WINAPI NtGetTickCount(void)
 842 {
 843     LARGE_INTEGER now;
 844
 845     NtQuerySystemTime( &now );
 846     return (now.QuadPart - server_start_time) / 10000;
 847 }
 848
 849
 850 /***********************************************************************
 851  *        TIME_GetTZAsStr [internal]
 852  *
 853  * Helper function that returns the given timezone as a string.
 854  *
 855  * PARAMS
 856  *   utc [I] The current utc time.
 857  *   bias [I] The bias of the current timezone.
 858  *   dst [I] ??
 859  *
 860  * RETURNS
 861  *   Timezone name.
 862  *
 863  * NOTES:
 864  *   This could be done with a hash table instead of merely iterating through a
 865  *   table, however with the small amount of entries (60 or so) I didn't think
 866  *   it was worth it.
 867  */
 868 static const WCHAR* TIME_GetTZAsStr (time_t utc, int bias, int dst)
 869 {
 870    char psTZName[7];
 871    struct tm *ptm = localtime(&utc);
 872    unsigned int i;
 873
 874    if (!strftime (psTZName, 7, "%Z", ptm))
 875       return (NULL);
 876
 877    for (i=0; i<(sizeof(TZ_INFO) / sizeof(struct tagTZ_INFO)); i++)
 878    {
 879       if ( strcmp(TZ_INFO[i].psTZFromUnix, psTZName) == 0 &&
 880            TZ_INFO[i].bias == bias &&
 881            TZ_INFO[i].dst == dst
 882          )
 883             return TZ_INFO[i].psTZWindows;
 884    }
 885    FIXME("Can't match system time zone name \"%s\", bias=%d and dst=%d "
 886          "to an entry in TZ_INFO. Please add appropriate entry to "
 887          "TZ_INFO and submit as patch to wine-patches\n",psTZName,bias,dst);
 888    return NULL;
 889 }
 890
 891 /***  TIME_GetTimeZoneInfoFromReg: helper for GetTimeZoneInformation ***/
 892
 893
 894 static int TIME_GetTimeZoneInfoFromReg(RTL_TIME_ZONE_INFORMATION *tzinfo)
 895 {
 896     BYTE buf[90];
 897     KEY_VALUE_PARTIAL_INFORMATION * KpInfo =
 898         (KEY_VALUE_PARTIAL_INFORMATION *) buf;
 899     HANDLE hkey;
 900     DWORD size;
 901     OBJECT_ATTRIBUTES attr;
 902     UNICODE_STRING nameW;
 903
 904     attr.Length = sizeof(attr);
 905     attr.RootDirectory = 0;
 906     attr.ObjectName = &nameW;
 907     attr.Attributes = 0;
 908     attr.SecurityDescriptor = NULL;
 909     attr.SecurityQualityOfService = NULL;
 910     RtlInitUnicodeString( &nameW, TZInformationKeyW);
 911     if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr )) {
 912
 913 #define GTZIFR_N( valkey, tofield) \
 914         RtlInitUnicodeString( &nameW, valkey );\
 915         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 916                     sizeof(buf), &size )) { \
 917             if( size >= (sizeof((tofield)) + \
 918                     offsetof(KEY_VALUE_PARTIAL_INFORMATION,Data))) { \
 919                 memcpy(&(tofield), \
 920                         KpInfo->Data, sizeof(tofield)); \
 921             } \
 922         }
 923 #define GTZIFR_S( valkey, tofield) \
 924         RtlInitUnicodeString( &nameW, valkey );\
 925         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 926                     sizeof(buf), &size )) { \
 927             size_t len = (strlenW( (WCHAR*)KpInfo->Data ) + 1) * sizeof(WCHAR); \
 928             if (len > sizeof(tofield)) len = sizeof(tofield); \
 929             memcpy( tofield, KpInfo->Data, len ); \
 930             tofield[(len/sizeof(WCHAR))-1] = 0; \
 931         }
 932
 933         GTZIFR_N( TZStandardStartW,  tzinfo->StandardDate)
 934         GTZIFR_N( TZDaylightStartW,  tzinfo->DaylightDate)
 935         GTZIFR_N( TZBiasW,          tzinfo->Bias)
 936         GTZIFR_N( TZStandardBiasW,  tzinfo->StandardBias)
 937         GTZIFR_N( TZDaylightBiasW,  tzinfo->DaylightBias)
 938         GTZIFR_S( TZStandardNameW, tzinfo->StandardName)
 939         GTZIFR_S( TZDaylightNameW, tzinfo->DaylightName)
 940
 941 #undef GTZIFR_N
 942 #undef GTZIFR_S
 943         NtClose( hkey );
 944         return 1;
 945     }
 946     return 0;
 947 }
 948
 949 /***********************************************************************
 950  *      RtlQueryTimeZoneInformation [NTDLL.@]
 951  *
 952  * Get information about the current timezone.
 953  *
 954  * PARAMS
 955  *   tzinfo [O] Destination for the retrieved timezone info.
 956  *
 957  * RETURNS
 958  *   Success: STATUS_SUCCESS.
 959  *   Failure: An NTSTATUS error code indicating the problem.
 960  */
 961 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *tzinfo)
 962 {
 963     time_t gmt;
 964     int bias, daylight;
 965     const WCHAR *psTZ;
 966
 967     memset(tzinfo, 0, sizeof(RTL_TIME_ZONE_INFORMATION));
 968
 969     if( !TIME_GetTimeZoneInfoFromReg(tzinfo)) {
 970
 971         gmt = time(NULL);
 972         bias = TIME_GetBias(gmt, &daylight);
 973
 974         tzinfo->Bias = -bias / 60;
 975         tzinfo->StandardBias = 0;
 976         tzinfo->DaylightBias = -60;
 977         tzinfo->StandardName[0]='\0';
 978         tzinfo->DaylightName[0]='\0';
 979         psTZ = TIME_GetTZAsStr (gmt, (-bias/60), daylight);
 980         if (psTZ) strcpyW( tzinfo->StandardName, psTZ );
 981         }
 982     return STATUS_SUCCESS;
 983 }
 984
 985 /***********************************************************************
 986  *       RtlSetTimeZoneInformation [NTDLL.@]
 987  *
 988  * Set the current time zone information.
 989  *
 990  * PARAMS
 991  *   tzinfo [I] Timezone information to set.
 992  *
 993  * RETURNS
 994  *   Success: STATUS_SUCCESS.
 995  *   Failure: An NTSTATUS error code indicating the problem.
 996  *
 997  */
 998 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
 999 {
1000     return STATUS_PRIVILEGE_NOT_HELD;
1001 }
1002
1003 /***********************************************************************
1004  *        NtSetSystemTime [NTDLL.@]
1005  *        ZwSetSystemTime [NTDLL.@]
1006  *
1007  * Set the system time.
1008  *
1009  * PARAMS
1010  *   NewTime [I] The time to set.
1011  *   OldTime [O] Optional destination for the previous system time.
1012  *
1013  * RETURNS
1014  *   Success: STATUS_SUCCESS.
1015  *   Failure: An NTSTATUS error code indicating the problem.
1016  */
1017 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
1018 {
1019     TIME_FIELDS tf;
1020     struct timeval tv;
1021     struct timezone tz;
1022     struct tm t;
1023     time_t sec, oldsec;
1024     int dst, bias;
1025     int err;
1026
1027     /* Return the old time if necessary */
1028     if(OldTime)
1029         NtQuerySystemTime(OldTime);
1030
1031     RtlTimeToTimeFields(NewTime, &tf);
1032
1033     /* call gettimeofday to get the current timezone */
1034     gettimeofday(&tv, &tz);
1035     oldsec = tv.tv_sec;
1036     /* get delta local time from utc */
1037     bias = TIME_GetBias(oldsec, &dst);
1038
1039     /* get the number of seconds */
1040     t.tm_sec = tf.Second;
1041     t.tm_min = tf.Minute;
1042     t.tm_hour = tf.Hour;
1043     t.tm_mday = tf.Day;
1044     t.tm_mon = tf.Month - 1;
1045     t.tm_year = tf.Year - 1900;
1046     t.tm_isdst = dst;
1047     sec = mktime (&t);
1048     /* correct for timezone and daylight */
1049     sec += bias;
1050
1051     /* set the new time */
1052     tv.tv_sec = sec;
1053     tv.tv_usec = tf.Milliseconds * 1000;
1054
1055     /* error and sanity check*/
1056     if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
1057         err = 2;
1058     } else {
1059 #ifdef HAVE_SETTIMEOFDAY
1060         err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
1061         if(err == 0)
1062             return STATUS_SUCCESS;
1063 #else
1064         err = 1;
1065 #endif
1066     }
1067
1068     ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
1069             tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
1070             (long)(sec-oldsec),
1071             err == -1 ? "No Permission"
1072                       : sec == (time_t)-1 ? "" : "is too large." );
1073
1074     if(err == 2)
1075         return STATUS_INVALID_PARAMETER;
1076     else if(err == -1)
1077         return STATUS_PRIVILEGE_NOT_HELD;
1078     else
1079         return STATUS_NOT_IMPLEMENTED;
1080 }