关于 Windows 中的时区信息

来源：互联网发布：如何注册手机淘宝店铺编辑：程序博客网时间：2024/05/01 22:05

Windows API 没有提供直接得到特定时区信息的功能，Windows 系统中的时区信息存储在注册表中下面的位置：

HKEY_LOCAL_MACHINE
SOFTWARE
Microsoft
Windows NT
CurrentVersion
Time Zones
time_zone_name

下面的代码演示了如何从注册表中枚举时区信息：

#include <stdio.h>#include <windows.h>#define pWin32Error(dwSysErr, sMsg )typedef struct _REG_TZI_FORMAT{    LONG Bias;    LONG StandardBias;    LONG DaylightBias;    SYSTEMTIME StandardDate;    SYSTEMTIME DaylightDate;} REG_TZI_FORMAT;#define REG_TIME_ZONES "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\"#define REG_TIME_ZONES_LEN (sizeof(REG_TIME_ZONES)-1)#define REG_TZ_KEY_MAXLEN (REG_TIME_ZONES_LEN + (sizeof(((TIME_ZONE_INFORMATION*)0)->StandardName)/2) -1)int GetTimeZoneInformationByName(TIME_ZONE_INFORMATION *ptzi, const char StandardName[]) {    int rc;    HKEY hkey_tz;    DWORD dw;    REG_TZI_FORMAT regtzi;    char tzsubkey[REG_TZ_KEY_MAXLEN+1] = REG_TIME_ZONES;    strncpy(tzsubkey + REG_TIME_ZONES_LEN, StandardName, sizeof(tzsubkey) - REG_TIME_ZONES_LEN);    if (tzsubkey[sizeof(tzsubkey)-1] != 0) {        fprintf(stderr, "timezone name too long\n");        return -1;    }    if (ERROR_SUCCESS != (dw = RegOpenKey(HKEY_LOCAL_MACHINE, tzsubkey, &hkey_tz))) {        fprintf(stderr, "failed to open: HKEY_LOCAL_MACHINE\\%s\n", tzsubkey);        pWin32Error(dw, "RegOpenKey() failed");        return -1;    }    rc = 0;    #define X(param, type, var) \        do if ((dw = sizeof(var)), (ERROR_SUCCESS != (dw = RegGetValueW(hkey_tz, NULL, param, type, NULL, &var, &dw)))) { \            fprintf(stderr, "failed to read: HKEY_LOCAL_MACHINE\\%s\\%S\n", tzsubkey, param); \            pWin32Error(dw, "RegGetValue() failed"); \            rc = -1; \            goto ennd; \        } while(0)    X(L"TZI", RRF_RT_REG_BINARY, regtzi);    X(L"Std", RRF_RT_REG_SZ, ptzi->StandardName);    X(L"Dlt", RRF_RT_REG_SZ, ptzi->DaylightName);    #undef X    ptzi->Bias = regtzi.Bias;    ptzi->DaylightBias = regtzi.DaylightBias;    ptzi->DaylightDate = regtzi.DaylightDate;    ptzi->StandardBias = regtzi.StandardBias;    ptzi->StandardDate = regtzi.StandardDate;ennd:    RegCloseKey(hkey_tz);    return rc;}#define ZONE "Russian Standard Time"int main(int argc, char* argv[]){    DWORD dw;    TIME_ZONE_INFORMATION tzi;    dw = GetTimeZoneInformationByName(&tzi, ZONE);    if (dw != 0) return 1;    SYSTEMTIME lt;    SYSTEMTIME ut = {        2000, /*WORD wYear;*/        1, /*WORD wMonth;*/        0, /*WORD wDayOfWeek;*/        1, /*WORD wDay;*/        12, /*WORD wHour;*/        0, /*WORD wMinute;*/        0, /*WORD wSecond;*/        0 /*WORD wMilliseconds;*/    };    SystemTimeToTzSpecificLocalTime(&tzi, &ut, <);    printf("%d-%02d-%02d %02d:%02d:%02d UTC\n", ut.wYear, ut.wMonth, ut.wDay, ut.wHour, ut.wMinute, ut.wSecond);    printf("=\n");    printf("%d-%02d-%02d %02d:%02d:%02d Europe/Moscow\n", lt.wYear, lt.wMonth, lt.wDay, lt.wHour, lt.wMinute, lt.wSecond);    return 0;}

0 0