标题: Windows日期时间与相互转化
作者: Demon
链接: https://demon.tw/programming/datetime-formats-and-conversions.html
版权: 本博客的所有文章，都遵守“署名-非商业性使用-相同方式共享 2.5 中国大陆”协议条款。
在Windows中有各种不同的日期和时间格式，不幸的是你经常需要在它们之间转换以实现某些有用的功能，这意味着知道每种格式的属性是很重要的。
下面是一张关于标准日期和时间格式的简单表格：
|
Container |
Domain |
Format / Notes |
Min Date |
Resolution |
|
SYSTEMTIME |
Win32 |
Struct (16 bytes) |
January 1, 1601 |
1 millisecond |
|
FILETIME |
Win32 |
Offset value (64bit unsigned int) |
January 1, 1601 |
100 nanoseconds |
|
VT_DATE |
Win32 / OLE Automation |
Offset value (64bit signed float), 0.0 is December 30, 1899. |
January 1, 100 (1) |
500 milliseconds (2) |
|
FAT/MS-DOS |
Win32 |
Struct (values packed into two 16bit ints) |
January 1, 1980 |
2 seconds |
|
time_t |
CRT |
Offset value (unsigned int) |
January 1, 1970 |
1 second |
|
tm |
CRT |
Struct (36 bytes (3)) |
January 1, 1900 |
1 second |
相互转化
Windows时间：
|
|
SYSTEMTIME |
FILETIME |
VT_DATE |
FAT/MS-DOS |
|
SYSTEMTIME |
|
SystemTimeToFileTime |
SystemTimeToVariantTime |
|
|
FILETIME |
FileTimeToSystemTime |
|
|
FileTimeToDosDateTime |
|
VT_DATE |
VariantTimeToSystemTime |
|
|
VariantTimeToDosDateTime |
|
FAT/MS-DOS |
|
DosDateTimeToFileTime |
DosDateTimeToVariantTime |
|
CRT时间：
|
|
time_t |
tm |
|
time_t |
|
gmtime |
|
tm |
mktime |
|
SYSTEMTIME与time_t的转化：
void SystemTimeToTime_t(SYSTEMTIME *systemTime, time_t *dosTime)
{
LARGE_INTEGER jan1970FT = {0};
jan1970FT.QuadPart = 116444736000000000I64; // january 1st 1970
LARGE_INTEGER utcFT = {0};
SystemTimeToFileTime(systemTime, (FILETIME*)&utcFT);
unsigned __int64 utcDosTime = (utcFT.QuadPart - jan1970FT.QuadPart)/10000000;
*dosTime = (time_t)utcDosTime;
}
void Time_tToSystemTime(time_t dosTime, SYSTEMTIME *systemTime)
{
LARGE_INTEGER jan1970FT = {0};
jan1970FT.QuadPart = 116444736000000000I64; // january 1st 1970
LARGE_INTEGER utcFT = {0};
utcFT.QuadPart = ((unsigned __int64)dosTime)*10000000 + jan1970FT.QuadPart;
FileTimeToSystemTime((FILETIME*)&utcFT, systemTime);
}
参考链接：http://blogs.msdn.com/b/joshpoley/archive/2007/12/19/date-time-formats-and-conversions.aspx
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