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    {"PYT",
 172     {'P','a','r','a','g','u','a','y','a','n',' ',
 173      'S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'}, 240, 0},
 174    {"PYST",
 175     {'P','a','r','a','g','u','a','y','a','n',' ','S','u','m','m','e','r',
 176      ' ','T','i','m','e','\0'}, 180, 1},
 177    {"ART",
 178     {'S','A',' ','E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 179      'd',' ','T','i','m','e','\0'}, 180, 0},
 180    {"WGST",
 181     {'G','r','e','e','n','l','a','n','d',' ','S','t','a','n','d','a','r','d',
 182      ' ','T','i','m','e','\0'}, 120, 1},
 183    {"GST",
 184     {'M','i','d','-','A','t','l','a','n','t','i','c',' ','S','t','a','n','d',
 185      'a','r','d',' ','T','i','m','e','\0'}, 120, 0},
 186    {"AZOT",
 187     {'A','z','o','r','e','s',' ','S','t','a','n','d','a','r','d',' ','T','i',
 188      'm','e',0}, 60, 0},
 189    {"AZOST",
 190     {'A','z','o','r','e','s',' ','S','t','a','n','d','a','r','d',' ','T','i',
 191      'm','e','\0'}, 0, 1},
 192    {"CVT",
 193     {'C','a','p','e',' ','V','e','r','d','e',' ','S','t','a','n','d','a','r',
 194      'd',' ','T','i','m','e','\0'}, 60, 0},
 195    {"WEST",
 196     {'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},
 197    {"WET",
 198     {'G','r','e','e','n','w','i','c','h',' ','S','t','a','n','d','a','r','d',
 199      ' ','T','i','m','e','\0'}, 0, 0},
 200    {"BST",
 201     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 202     -60, 1},
 203    {"IST",
 204     {'I','r','i','s','h',' ','S','u','m','m','e','r',' ','T','i','m','e','\0'},
 205     -60, 1},
 206    {"GMT",
 207     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 208     0, 0},
 209    {"UTC",
 210     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 211     0, 0},
 212    {"CET",
 213     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e','a','n',' ',
 214      'T','i','m','e','\0'}, -60, 0},
 215    {"CEST",
 216     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','S','t','a',
 217      'n','d','a','r','d',' ','T','i','m','e','\0'}, -120, 1},
 218    {"MET",
 219     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','S','t','a',
 220      'n','d','a','r','d',' ','T','i','m','e','\0'}, -60, 0},
 221    {"MEST",
 222     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','D','a','y',
 223      'l','i','g','h','t',' ','T','i','m','e','\0'}, -120, 1},
 224    {"WAT",
 225     {'W','.',' ','C','e','n','t','r','a','l',' ','A','f','r','i','c','a',' ',
 226      'S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'}, -60, 0},
 227    {"EEST",
 228     {'E','.',' ','E','u','r','o','p','e',' ','S','t','a','n','d','a','r','d',
 229      ' ','T','i','m','e','\0'}, -180, 1},
 230    {"EET",
 231     {'E','g','y','p','t',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 232      'e','\0'}, -120, 0},
 233    {"CAT",
 234     {'C','e','n','t','r','a','l',' ','A','f','r','i','c','a','n',' '
 235     ,'T','i','m','e','\0'}, -120, 0},
 236    {"SAST",
 237     {'S','o','u','t','h',' ','A','f','r','i','c','a',' ','S','t','a','n','d',
 238      'a','r','d',' ','T','i','m','e','\0'}, -120, 0},
 239    {"IST",
 240     {'I','s','r','a','e','l',' ','S','t','a','n','d','a','r','d',' ','T','i',
 241      'm','e','\0'}, -120, 0},
 242    {"IDT",
 243     {'I','s','r','a','e','l',' ','S','t','a','n','d','a','r','d',' ','T','i',
 244      'm','e','\0'}, -180, 1},
 245    {"MSK",
 246     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 247      'i','m','e','\0'}, -180, 0},
 248    {"ADT",
 249     {'A','r','a','b','i','c',' ','S','t','a','n','d','a','r','d',' ','T','i',
 250      'm','e','\0'}, -240, 1},
 251    {"AST",
 252     {'A','r','a','b',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 253      '\0'}, -180, 0},
 254    {"MSD",
 255     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 256      'i','m','e','\0'}, -240, 1},
 257    {"EAT",
 258     {'E','.',' ','A','f','r','i','c','a',' ','S','t','a','n','d','a','r','d',
 259      ' ','T','i','m','e','\0'}, -180, 0},
 260    {"IRST",
 261     {'I','r','a','n',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 262      0},-210, 0 },
 263    {"IRST",
 264     {'I','r','a','n',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 265      '\0'}, -270, 1},
 266    {"GST",
 267     {'A','r','a','b','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 268      'i','m','e','\0'}, -240, 0},
 269    {"AZT",
 270     {'C','a','u','c','a','s','u','s',' ','S','t','a','n','d','a','r','d',' ',
 271      'T','i','m','e',0}, -240, 0 },
 272    {"AZST",
 273     {'C','a','u','c','a','s','u','s',' ','S','t','a','n','d','a','r','d',' ',
 274      'T','i','m','e','\0'}, -300, 1},
 275    {"AFT",
 276     {'A','f','g','h','a','n','i','s','t','a','n',' ','S','t','a','n','d','a',
 277      'r','d',' ','T','i','m','e','\0'}, -270, 0},
 278    {"SAMT",
 279     {'S','a','m','a','r','a',' ','S','t','a','n','d','a','r','d',' ','T','i',
 280      'm','e','\0'}, -270, 1},
 281    {"YEKT",
 282     {'U','r','a','l','s',' ','S','t','a','n','d','a','r','d',
 283      ' ','T','i','m','e',' ','(','W','i','n','t','e','r',')','\0'}, -300, 0},
 284    {"YEKST",
 285     {'U','r','a','l','s',' ','D','a','y','l','i','g','h','t',
 286      ' ','T','i','m','e',' ','(','S','u','m','m','e','r',')','\0'}, -360, 1},
 287    {"OMST",
 288     {'O','m','s','k',' ','S','t','a','n','d','a','r','d',
 289      ' ','T','i','m','e',' ','(','W','i','n','t','e','r',')','\0'}, -360, 0},
 290    {"OMSST",
 291     {'O','m','s','k',' ','D','a','y','l','i','g','h','t',
 292      ' ','T','i','m','e',' ','(','S','u','m','m','e','r',')','\0'}, -420, 1},
 293    {"PKT",
 294     {'W','e','s','t',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',
 295      ' ','T','i','m','e','\0'}, -300, 0},
 296    {"IST",
 297     {'I','n','d','i','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 298      'e','\0'}, -330, 0},
 299    {"NPT",
 300     {'N','e','p','a','l',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 301      'e','\0'}, -345, 0},
 302    {"ALMST",
 303     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 304      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -420, 1},
 305    {"BDT",
 306     {'C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t','a','n','d',
 307      'a','r','d',' ','T','i','m','e','\0'}, -360, 0},
 308    {"LKT",
 309     {'S','r','i',' ','L','a','n','k','a',' ','S','t','a','n','d','a','r','d',
 310      ' ','T','i','m','e','\0'}, -360, 0},
 311    {"MMT",
 312     {'M','y','a','n','m','a','r',' ','S','t','a','n','d','a','r','d',' ','T',
 313      'i','m','e','\0'}, -390, 0},
 314    {"ICT",
 315     {'S','E',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',' ','T',
 316      'i','m','e','\0'}, -420, 0},
 317    {"KRAT",
 318     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 319      'd',' ','T','i','m','e',0}, -420, 0},
 320    {"KRAST",
 321     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 322      'd',' ','T','i','m','e','\0'}, -480, 1},
 323    {"IRKT",
 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}, -480, 0},
 326    {"CST",
 327     {'C','h','i','n','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 328      'e','\0'}, -480, 0},
 329    {"IRKST",
 330     {'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
 331      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -540, 1},
 332    {"SGT",
 333     {'M','a','l','a','y',' ','P','e','n','i','n','s','u','l','a',' ','S','t',
 334      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 335    {"WST",
 336     {'W','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 337      'a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 338    {"WST",
 339     {'W','.',' ','A','u','s','t','r','a','l','i','a',' ','S','u','m','m','e',
 340      'r',' ','T','i','m','e','\0'}, -540, 1},
 341    {"JST",
 342     {'T','o','k','y','o',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 343      'e','\0'}, -540, 0},
 344    {"KST",
 345     {'K','o','r','e','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 346      'e','\0'}, -540, 0},
 347    {"YAKST",
 348     {'Y','a','k','u','t','s','k',' ','S','t','a','n','d','a','r','d',' ','T',
 349      'i','m','e','\0'}, -600, 1},
 350    {"CST",
 351     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a',
 352      'n','d','a','r','d',' ','T','i','m','e','\0'}, -570, 0},
 353    {"CST",
 354     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','D','a','y',
 355      'l','i','g','h','t',' ','T','i','m','e','\0'}, -630, 1},
 356    {"EST",
 357     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 358      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 359    {"EST",
 360     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 361      'a','r','d',' ','T','i','m','e','\0'}, -660, 1},
 362    {"GST",
 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    {"VLAT",
 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}, -600, 0 },
 368    {"ChST",
 369     {'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
 370      'a','r','d',' ','T','i','m','e',0}, -600, 0},
 371    {"VLAST",
 372     {'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
 373      'r','d',' ','T','i','m','e','\0'}, -660, 1},
 374    {"MAGT",
 375     {'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
 376      'a','n','d','a','r','d',' ','T','i','m','e',0}, -660, 0},
 377    {"MAGST",
 378     {'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
 379      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -720, 1},
 380    {"NZST",
 381     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','S','t','a','n','d','a',
 382      'r','d',' ','T','i','m','e','\0'}, -720, 0},
 383    {"NZDT",
 384     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','D','a','y','l','i','g',
 385      'h','t',' ','T','i','m','e','\0'}, -780, 1},
 386    {"FJT",
 387     {'F','i','j','i',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 388      '\0'}, -720, 0},
 389    {"TOT",
 390     {'T','o','n','g','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 391      'e','\0'}, -780, 0},
 392    {"NOVT",
 393     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 394      'a','n','d','a','r','d',' ','T','i','m','e',0 }, -360, 0},
 395    {"NOVT",
 396     {'N','o','v','o','s','i','b','i','r','s','k',' ','S','t','a','n','d','a',
 397      'r','d',' ','T','i','m','e','\0'}, -360, 1},
 398    {"ANAT",
 399     {'A','n','a','d','y','r',' ','S','t','a','n','d','a','r','d',' ','T','i',
 400      'm','e','\0'}, -720, 1},
 401    {"HKT",
 402     {'H','o','n','g',' ','K','o','n','g',' ','S','t','a','n','d','a','r','d',
 403      ' ','T','i','m','e','\0'}, -480, 0},
 404    {"UYT",
 405     {'U','r','u','g','u','a','y','a','n',' ','T','i','m','e','\0'}, 180, 0},
 406    {"UYST",
 407     {'U','r','u','g','u','a','y','a','n',' ','S','u','m','m','e','r',' ','T',
 408     'i','m','e','\0'}, 120, 1},
 409    {"MYT",
 410     {'M','a','l','a','y','s','i','a','n',' ','T','i','m','e','\0'}, -480, 0},
 411    {"PHT",
 412     {'P','h','i','l','i','p','p','i','n','e',' ','T','i','m','e','\0'}, -480, 0},
 413    {"NOVST",
 414     {'N','o','v','o','s','i','b','i','r','s','k',' ','S','u','m','m','e','r',
 415      ' ','T','i','m','e','\0'}, -420, 1},
 416    {"UZT",
 417     {'U','z','b','e','k','i','s','t','h','a','n',' ','T','i','m','e','\0'}, -300, 0}
 418 };
 419
 420 #define TICKSPERSEC        10000000
 421 #define TICKSPERMSEC       10000
 422 #define SECSPERDAY         86400
 423 #define SECSPERHOUR        3600
 424 #define SECSPERMIN         60
 425 #define MINSPERHOUR        60
 426 #define HOURSPERDAY        24
 427 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
 428 #define DAYSPERWEEK        7
 429 #define EPOCHYEAR          1601
 430 #define DAYSPERNORMALYEAR  365
 431 #define DAYSPERLEAPYEAR    366
 432 #define MONSPERYEAR        12
 433 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
 434 #define DAYSPERNORMALCENTURY (365 * 100 + 24)
 435 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
 436
 437 /* 1601 to 1970 is 369 years plus 89 leap days */
 438 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
 439 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
 440 /* 1601 to 1980 is 379 years plus 91 leap days */
 441 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
 442 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
 443 /* max ticks that can be represented as Unix time */
 444 #define TICKS_1601_TO_UNIX_MAX ((SECS_1601_TO_1970 + INT_MAX) * TICKSPERSEC)
 445
 446
 447 static const int MonthLengths[2][MONSPERYEAR] =
 448 {
 449         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 450         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 451 };
 452
 453 static inline int IsLeapYear(int Year)
 454 {
 455         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
 456 }
 457
 458 /******************************************************************************
 459  *       RtlTimeToTimeFields [NTDLL.@]
 460  *
 461  * Convert a time into a TIME_FIELDS structure.
 462  *
 463  * PARAMS
 464  *   liTime     [I] Time to convert.
 465  *   TimeFields [O] Destination for the converted time.
 466  *
 467  * RETURNS
 468  *   Nothing.
 469  */
 470 VOID WINAPI RtlTimeToTimeFields(
 471         const LARGE_INTEGER *liTime,
 472         PTIME_FIELDS TimeFields)
 473 {
 474         int SecondsInDay;
 475         long int cleaps, years, yearday, months;
 476         long int Days;
 477         LONGLONG Time;
 478
 479         /* Extract millisecond from time and convert time into seconds */
 480         TimeFields->Milliseconds =
 481             (CSHORT) (( liTime->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
 482         Time = liTime->QuadPart / TICKSPERSEC;
 483
 484         /* The native version of RtlTimeToTimeFields does not take leap seconds
 485          * into account */
 486
 487         /* Split the time into days and seconds within the day */
 488         Days = Time / SECSPERDAY;
 489         SecondsInDay = Time % SECSPERDAY;
 490
 491         /* compute time of day */
 492         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 493         SecondsInDay = SecondsInDay % SECSPERHOUR;
 494         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 495         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 496
 497         /* compute day of week */
 498         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 499
 500         /* compute year, month and day of month. */
 501         cleaps=( 3 * ((4 * Days + 1227) / DAYSPERQUADRICENTENNIUM) + 3 ) / 4;
 502         Days += 28188 + cleaps;
 503         years = (20 * Days - 2442) / (5 * DAYSPERNORMALQUADRENNIUM);
 504         yearday = Days - (years * DAYSPERNORMALQUADRENNIUM)/4;
 505         months = (64 * yearday) / 1959;
 506         /* the result is based on a year starting on March.
 507          * To convert take 12 from Januari and Februari and
 508          * increase the year by one. */
 509         if( months < 14 ) {
 510             TimeFields->Month = months - 1;
 511             TimeFields->Year = years + 1524;
 512         } else {
 513             TimeFields->Month = months - 13;
 514             TimeFields->Year = years + 1525;
 515         }
 516         /* calculation of day of month is based on the wonderful
 517          * sequence of INT( n * 30.6): it reproduces the
 518          * 31-30-31-30-31-31 month lengths exactly for small n's */
 519         TimeFields->Day = yearday - (1959 * months) / 64 ;
 520         return;
 521 }
 522
 523 /******************************************************************************
 524  *       RtlTimeFieldsToTime [NTDLL.@]
 525  *
 526  * Convert a TIME_FIELDS structure into a time.
 527  *
 528  * PARAMS
 529  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 530  *   Time         [O] Destination for the converted time.
 531  *
 532  * RETURNS
 533  *   Success: TRUE.
 534  *   Failure: FALSE.
 535  */
 536 BOOLEAN WINAPI RtlTimeFieldsToTime(
 537         PTIME_FIELDS tfTimeFields,
 538         PLARGE_INTEGER Time)
 539 {
 540         int month, year, cleaps, day;
 541
 542         /* FIXME: normalize the TIME_FIELDS structure here */
 543         /* No, native just returns 0 (error) if the fields are not */
 544         if( tfTimeFields->Milliseconds< 0 || tfTimeFields->Milliseconds > 999 ||
 545                 tfTimeFields->Second < 0 || tfTimeFields->Second > 59 ||
 546                 tfTimeFields->Minute < 0 || tfTimeFields->Minute > 59 ||
 547                 tfTimeFields->Hour < 0 || tfTimeFields->Hour > 23 ||
 548                 tfTimeFields->Month < 1 || tfTimeFields->Month > 12 ||
 549                 tfTimeFields->Day < 1 ||
 550                 tfTimeFields->Day > MonthLengths
 551                     [ tfTimeFields->Month ==2 || IsLeapYear(tfTimeFields->Year)]
 552                     [ tfTimeFields->Month - 1] ||
 553                 tfTimeFields->Year < 1601 )
 554             return FALSE;
 555
 556         /* now calculate a day count from the date
 557          * First start counting years from March. This way the leap days
 558          * are added at the end of the year, not somewhere in the middle.
 559          * Formula's become so much less complicate that way.
 560          * To convert: add 12 to the month numbers of Jan and Feb, and
 561          * take 1 from the year */
 562         if(tfTimeFields->Month < 3) {
 563             month = tfTimeFields->Month + 13;
 564             year = tfTimeFields->Year - 1;
 565         } else {
 566             month = tfTimeFields->Month + 1;
 567             year = tfTimeFields->Year;
 568         }
 569         cleaps = (3 * (year / 100) + 3) / 4;   /* nr of "century leap years"*/
 570         day =  (36525 * year) / 100 - cleaps + /* year * dayperyr, corrected */
 571                  (1959 * month) / 64 +         /* months * daypermonth */
 572                  tfTimeFields->Day -          /* day of the month */
 573                  584817 ;                      /* zero that on 1601-01-01 */
 574         /* done */
 575
 576         Time->QuadPart = (((((LONGLONG) day * HOURSPERDAY +
 577             tfTimeFields->Hour) * MINSPERHOUR +
 578             tfTimeFields->Minute) * SECSPERMIN +
 579             tfTimeFields->Second ) * 1000 +
 580             tfTimeFields->Milliseconds ) * TICKSPERMSEC;
 581
 582         return TRUE;
 583 }
 584
 585 /***********************************************************************
 586  *       TIME_GetBias [internal]
 587  *
 588  * Helper function calculates delta local time from UTC.
 589  *
 590  * PARAMS
 591  *   utc [I] The current utc time.
 592  *   pdaylight [I] Local daylight.
 593  *
 594  * RETURNS
 595  *   The bias for the current timezone.
 596  */
 597 static int TIME_GetBias(time_t utc, int *pdaylight)
 598 {
 599     struct tm *ptm;
 600     static time_t last_utc;
 601     static int last_bias;
 602     static int last_daylight;
 603     int ret;
 604
 605     RtlEnterCriticalSection( &TIME_GetBias_section );
 606     if(utc == last_utc)
 607     {
 608         *pdaylight = last_daylight;
 609         ret = last_bias;
 610     } else
 611     {
 612         ptm = localtime(&utc);
 613         *pdaylight = last_daylight =
 614             ptm->tm_isdst; /* daylight for local timezone */
 615         ptm = gmtime(&utc);
 616         ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
 617         last_utc = utc;
 618         ret = last_bias = (int)(utc-mktime(ptm));
 619     }
 620     RtlLeaveCriticalSection( &TIME_GetBias_section );
 621     return ret;
 622 }
 623
 624 /******************************************************************************
 625  *        RtlLocalTimeToSystemTime [NTDLL.@]
 626  *
 627  * Convert a local time into system time.
 628  *
 629  * PARAMS
 630  *   LocalTime  [I] Local time to convert.
 631  *   SystemTime [O] Destination for the converted time.
 632  *
 633  * RETURNS
 634  *   Success: STATUS_SUCCESS.
 635  *   Failure: An NTSTATUS error code indicating the problem.
 636  */
 637 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 638                                           PLARGE_INTEGER SystemTime)
 639 {
 640     time_t gmt;
 641     int bias, daylight;
 642
 643     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 644
 645     gmt = time(NULL);
 646     bias = TIME_GetBias(gmt, &daylight);
 647
 648     SystemTime->QuadPart = LocalTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 649     return STATUS_SUCCESS;
 650 }
 651
 652 /******************************************************************************
 653  *       RtlSystemTimeToLocalTime [NTDLL.@]
 654  *
 655  * Convert a system time into a local time.
 656  *
 657  * PARAMS
 658  *   SystemTime [I] System time to convert.
 659  *   LocalTime  [O] Destination for the converted time.
 660  *
 661  * RETURNS
 662  *   Success: STATUS_SUCCESS.
 663  *   Failure: An NTSTATUS error code indicating the problem.
 664  */
 665 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 666                                           PLARGE_INTEGER LocalTime )
 667 {
 668     time_t gmt;
 669     int bias, daylight;
 670
 671     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 672
 673     gmt = time(NULL);
 674     bias = TIME_GetBias(gmt, &daylight);
 675
 676     LocalTime->QuadPart = SystemTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 677     return STATUS_SUCCESS;
 678 }
 679
 680 /******************************************************************************
 681  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 682  *
 683  * Convert a time into a count of seconds since 1970.
 684  *
 685  * PARAMS
 686  *   Time    [I] Time to convert.
 687  *   Seconds [O] Destination for the converted time.
 688  *
 689  * RETURNS
 690  *   Success: TRUE.
 691  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 692  */
 693 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 694 {
 695     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 696     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 697     tmp -= SECS_1601_TO_1970;
 698     if (tmp > 0xffffffff) return FALSE;
 699     *Seconds = (DWORD)tmp;
 700     return TRUE;
 701 }
 702
 703 /******************************************************************************
 704  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 705  *
 706  * Convert a time into a count of seconds since 1980.
 707  *
 708  * PARAMS
 709  *   Time    [I] Time to convert.
 710  *   Seconds [O] Destination for the converted time.
 711  *
 712  * RETURNS
 713  *   Success: TRUE.
 714  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 715  */
 716 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 717 {
 718     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 719     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 720     tmp -= SECS_1601_TO_1980;
 721     if (tmp > 0xffffffff) return FALSE;
 722     *Seconds = (DWORD)tmp;
 723     return TRUE;
 724 }
 725
 726 /******************************************************************************
 727  *       RtlSecondsSince1970ToTime [NTDLL.@]
 728  *
 729  * Convert a count of seconds since 1970 to a time.
 730  *
 731  * PARAMS
 732  *   Seconds [I] Time to convert.
 733  *   Time    [O] Destination for the converted time.
 734  *
 735  * RETURNS
 736  *   Nothing.
 737  */
 738 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 739 {
 740     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 741     Time->u.LowPart  = (DWORD)secs;
 742     Time->u.HighPart = (DWORD)(secs >> 32);
 743 }
 744
 745 /******************************************************************************
 746  *       RtlSecondsSince1980ToTime [NTDLL.@]
 747  *
 748  * Convert a count of seconds since 1980 to a time.
 749  *
 750  * PARAMS
 751  *   Seconds [I] Time to convert.
 752  *   Time    [O] Destination for the converted time.
 753  *
 754  * RETURNS
 755  *   Nothing.
 756  */
 757 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 758 {
 759     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 760     Time->u.LowPart  = (DWORD)secs;
 761     Time->u.HighPart = (DWORD)(secs >> 32);
 762 }
 763
 764 /******************************************************************************
 765  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 766  *
 767  * Convert a time to a count of elapsed seconds.
 768  *
 769  * PARAMS
 770  *   Time       [I] Time to convert.
 771  *   TimeFields [O] Destination for the converted time.
 772  *
 773  * RETURNS
 774  *   Nothing.
 775  */
 776 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 777 {
 778     LONGLONG time;
 779     INT rem;
 780
 781     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 782     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 783
 784     /* time is now in seconds */
 785     TimeFields->Year  = 0;
 786     TimeFields->Month = 0;
 787     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 788
 789     /* rem is now the remaining seconds in the last day */
 790     TimeFields->Second = rem % 60;
 791     rem /= 60;
 792     TimeFields->Minute = rem % 60;
 793     TimeFields->Hour = rem / 60;
 794 }
 795
 796 /***********************************************************************
 797  *       NtQuerySystemTime [NTDLL.@]
 798  *       ZwQuerySystemTime [NTDLL.@]
 799  *
 800  * Get the current system time.
 801  *
 802  * PARAMS
 803  *   Time [O] Destination for the current system time.
 804  *
 805  * RETURNS
 806  *   Success: STATUS_SUCCESS.
 807  *   Failure: An NTSTATUS error code indicating the problem.
 808  */
 809 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 810 {
 811     struct timeval now;
 812
 813     gettimeofday( &now, 0 );
 814     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 815     Time->QuadPart += now.tv_usec * 10;
 816     return STATUS_SUCCESS;
 817 }
 818
 819 /******************************************************************************
 820  *  NtQueryPerformanceCounter   [NTDLL.@]
 821  *
 822  *  Note: Windows uses a timer clocked at a multiple of 1193182 Hz. There is a
 823  *  good number of applications that crash when the returned frequency is either
 824  *  lower or higher then what Windows gives. Also too high counter values are
 825  *  reported to give problems.
 826  */
 827 NTSTATUS WINAPI NtQueryPerformanceCounter( PLARGE_INTEGER Counter, PLARGE_INTEGER Frequency )
 828 {
 829     LARGE_INTEGER now;
 830
 831     if (!Counter) return STATUS_ACCESS_VIOLATION;
 832
 833     /* convert a counter that increments at a rate of 10 MHz
 834      * to one of 1.193182 MHz, with some care for arithmetic
 835      * overflow and good accuracy (21/176 = 0.11931818) */
 836     NtQuerySystemTime( &now );
 837     Counter->QuadPart = ((now.QuadPart - server_start_time) * 21) / 176;
 838     if (Frequency) Frequency->QuadPart = 1193182;
 839     return STATUS_SUCCESS;
 840 }
 841
 842
 843 /******************************************************************************
 844  * NtGetTickCount   (NTDLL.@)
 845  * ZwGetTickCount   (NTDLL.@)
 846  */
 847 ULONG WINAPI NtGetTickCount(void)
 848 {
 849     LARGE_INTEGER now;
 850
 851     NtQuerySystemTime( &now );
 852     return (now.QuadPart - server_start_time) / 10000;
 853 }
 854
 855
 856 /***********************************************************************
 857  *        TIME_GetTZAsStr [internal]
 858  *
 859  * Helper function that returns the given timezone as a string.
 860  *
 861  * PARAMS
 862  *   utc [I] The current utc time.
 863  *   bias [I] The bias of the current timezone.
 864  *   dst [I] ??
 865  *
 866  * RETURNS
 867  *   Timezone name.
 868  *
 869  * NOTES:
 870  *   This could be done with a hash table instead of merely iterating through a
 871  *   table, however with the small amount of entries (60 or so) I didn't think
 872  *   it was worth it.
 873  */
 874 static const WCHAR* TIME_GetTZAsStr (time_t utc, int bias, int dst)
 875 {
 876    char psTZName[7];
 877    struct tm *ptm = localtime(&utc);
 878    unsigned int i;
 879
 880    if (!strftime (psTZName, 7, "%Z", ptm))
 881       return (NULL);
 882
 883    for (i=0; i<(sizeof(TZ_INFO) / sizeof(struct tagTZ_INFO)); i++)
 884    {
 885       if ( strcmp(TZ_INFO[i].psTZFromUnix, psTZName) == 0 &&
 886            TZ_INFO[i].bias == bias &&
 887            TZ_INFO[i].dst == dst
 888          )
 889             return TZ_INFO[i].psTZWindows;
 890    }
 891    FIXME("Can't match system time zone name \"%s\", bias=%d and dst=%d "
 892          "to an entry in TZ_INFO. Please add appropriate entry to "
 893          "TZ_INFO and submit as patch to wine-patches\n",psTZName,bias,dst);
 894    return NULL;
 895 }
 896
 897 /***  TIME_GetTimeZoneInfoFromReg: helper for GetTimeZoneInformation ***/
 898
 899
 900 static int TIME_GetTimeZoneInfoFromReg(RTL_TIME_ZONE_INFORMATION *tzinfo)
 901 {
 902     BYTE buf[90];
 903     KEY_VALUE_PARTIAL_INFORMATION * KpInfo =
 904         (KEY_VALUE_PARTIAL_INFORMATION *) buf;
 905     HANDLE hkey;
 906     DWORD size;
 907     OBJECT_ATTRIBUTES attr;
 908     UNICODE_STRING nameW;
 909
 910     attr.Length = sizeof(attr);
 911     attr.RootDirectory = 0;
 912     attr.ObjectName = &nameW;
 913     attr.Attributes = 0;
 914     attr.SecurityDescriptor = NULL;
 915     attr.SecurityQualityOfService = NULL;
 916     RtlInitUnicodeString( &nameW, TZInformationKeyW);
 917     if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr )) {
 918
 919 #define GTZIFR_N( valkey, tofield) \
 920         RtlInitUnicodeString( &nameW, valkey );\
 921         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 922                     sizeof(buf), &size )) { \
 923             if( size >= (sizeof((tofield)) + \
 924                     offsetof(KEY_VALUE_PARTIAL_INFORMATION,Data))) { \
 925                 memcpy(&(tofield), \
 926                         KpInfo->Data, sizeof(tofield)); \
 927             } \
 928         }
 929 #define GTZIFR_S( valkey, tofield) \
 930         RtlInitUnicodeString( &nameW, valkey );\
 931         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 932                     sizeof(buf), &size )) { \
 933             size_t len = (strlenW( (WCHAR*)KpInfo->Data ) + 1) * sizeof(WCHAR); \
 934             if (len > sizeof(tofield)) len = sizeof(tofield); \
 935             memcpy( tofield, KpInfo->Data, len ); \
 936             tofield[(len/sizeof(WCHAR))-1] = 0; \
 937         }
 938
 939         GTZIFR_N( TZStandardStartW,  tzinfo->StandardDate)
 940         GTZIFR_N( TZDaylightStartW,  tzinfo->DaylightDate)
 941         GTZIFR_N( TZBiasW,          tzinfo->Bias)
 942         GTZIFR_N( TZStandardBiasW,  tzinfo->StandardBias)
 943         GTZIFR_N( TZDaylightBiasW,  tzinfo->DaylightBias)
 944         GTZIFR_S( TZStandardNameW, tzinfo->StandardName)
 945         GTZIFR_S( TZDaylightNameW, tzinfo->DaylightName)
 946
 947 #undef GTZIFR_N
 948 #undef GTZIFR_S
 949         NtClose( hkey );
 950         return 1;
 951     }
 952     return 0;
 953 }
 954
 955 /***********************************************************************
 956  *      RtlQueryTimeZoneInformation [NTDLL.@]
 957  *
 958  * Get information about the current timezone.
 959  *
 960  * PARAMS
 961  *   tzinfo [O] Destination for the retrieved timezone info.
 962  *
 963  * RETURNS
 964  *   Success: STATUS_SUCCESS.
 965  *   Failure: An NTSTATUS error code indicating the problem.
 966  */
 967 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *tzinfo)
 968 {
 969     time_t gmt;
 970     int bias, daylight;
 971     const WCHAR *psTZ;
 972
 973     memset(tzinfo, 0, sizeof(RTL_TIME_ZONE_INFORMATION));
 974
 975     if( !TIME_GetTimeZoneInfoFromReg(tzinfo)) {
 976
 977         gmt = time(NULL);
 978         bias = TIME_GetBias(gmt, &daylight);
 979
 980         tzinfo->Bias = -bias / 60;
 981         tzinfo->StandardBias = 0;
 982         tzinfo->DaylightBias = -60;
 983         tzinfo->StandardName[0]='\0';
 984         tzinfo->DaylightName[0]='\0';
 985         psTZ = TIME_GetTZAsStr (gmt, (-bias/60), daylight);
 986         if (psTZ) strcpyW( tzinfo->StandardName, psTZ );
 987         }
 988     return STATUS_SUCCESS;
 989 }
 990
 991 /***********************************************************************
 992  *       RtlSetTimeZoneInformation [NTDLL.@]
 993  *
 994  * Set the current time zone information.
 995  *
 996  * PARAMS
 997  *   tzinfo [I] Timezone information to set.
 998  *
 999  * RETURNS
1000  *   Success: STATUS_SUCCESS.
1001  *   Failure: An NTSTATUS error code indicating the problem.
1002  *
1003  */
1004 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
1005 {
1006     return STATUS_PRIVILEGE_NOT_HELD;
1007 }
1008
1009 /***********************************************************************
1010  *        NtSetSystemTime [NTDLL.@]
1011  *        ZwSetSystemTime [NTDLL.@]
1012  *
1013  * Set the system time.
1014  *
1015  * PARAMS
1016  *   NewTime [I] The time to set.
1017  *   OldTime [O] Optional destination for the previous system time.
1018  *
1019  * RETURNS
1020  *   Success: STATUS_SUCCESS.
1021  *   Failure: An NTSTATUS error code indicating the problem.
1022  */
1023 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
1024 {
1025     TIME_FIELDS tf;
1026     struct timeval tv;
1027     struct timezone tz;
1028     struct tm t;
1029     time_t sec, oldsec;
1030     int dst, bias;
1031     int err;
1032
1033     /* Return the old time if necessary */
1034     if(OldTime)
1035         NtQuerySystemTime(OldTime);
1036
1037     RtlTimeToTimeFields(NewTime, &tf);
1038
1039     /* call gettimeofday to get the current timezone */
1040     gettimeofday(&tv, &tz);
1041     oldsec = tv.tv_sec;
1042     /* get delta local time from utc */
1043     bias = TIME_GetBias(oldsec, &dst);
1044
1045     /* get the number of seconds */
1046     t.tm_sec = tf.Second;
1047     t.tm_min = tf.Minute;
1048     t.tm_hour = tf.Hour;
1049     t.tm_mday = tf.Day;
1050     t.tm_mon = tf.Month - 1;
1051     t.tm_year = tf.Year - 1900;
1052     t.tm_isdst = dst;
1053     sec = mktime (&t);
1054     /* correct for timezone and daylight */
1055     sec += bias;
1056
1057     /* set the new time */
1058     tv.tv_sec = sec;
1059     tv.tv_usec = tf.Milliseconds * 1000;
1060
1061     /* error and sanity check*/
1062     if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
1063         err = 2;
1064     } else {
1065 #ifdef HAVE_SETTIMEOFDAY
1066         err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
1067         if(err == 0)
1068             return STATUS_SUCCESS;
1069 #else
1070         err = 1;
1071 #endif
1072     }
1073
1074     ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
1075             tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
1076             (long)(sec-oldsec),
1077             err == -1 ? "No Permission"
1078                       : sec == (time_t)-1 ? "" : "is too large." );
1079
1080     if(err == 2)
1081         return STATUS_INVALID_PARAMETER;
1082     else if(err == -1)
1083         return STATUS_PRIVILEGE_NOT_HELD;
1084     else
1085         return STATUS_NOT_IMPLEMENTED;
1086 }