时间转换

[cppfaq]

请教，对于一个const char * 包含的wmi datetime（UTC）比如：
20140506032713.000000+***

如何能够转成FILETIME类型。

[赵4老师]

#include <stdio.h>
#include <string.h>
#include <time.h>
struct tm st;
time_t tt;
char timstr[40];
char tmpbuf[128];
char c;
int t;
int AP() {
    if ('P'==c || 'p'==c) {st.tm_hour+=12;return 1;}
    if ('A'==c || 'a'==c)                 return 1;
                                          return 0;
}
int dtparse() {
    if (7==sscanf(timstr,"%d/%d/%4d %d:%d:%d %c",&st.tm_mday,&st.tm_mon ,&st.tm_year,&st.tm_hour,&st.tm_min,&st.tm_sec,&c)) if (AP()) goto STEP2;
    if (6==sscanf(timstr,"%d/%d/%4d %d:%d%c"    ,&st.tm_mday,&st.tm_mon ,&st.tm_year,&st.tm_hour,&st.tm_min           ,&c)) if (AP()) goto STEP1;
    if (6==sscanf(timstr,"%4d/%d/%d %d:%d %c"   ,&st.tm_year,&st.tm_mon ,&st.tm_mday,&st.tm_hour,&st.tm_min           ,&c)) if (AP()) goto STEP1;
    if (5==sscanf(timstr,"%d.%d.%4d %d:%d"      ,&st.tm_mon ,&st.tm_mday,&st.tm_year,&st.tm_hour,&st.tm_min              ))           goto STEP1;
    if (6==sscanf(timstr,"%4d-%d-%d %d:%d:%d"   ,&st.tm_year,&st.tm_mon ,&st.tm_mday,&st.tm_hour,&st.tm_min,&st.tm_sec   ))           goto STEP2;
STEP1:
    st.tm_sec=0;
STEP2:
    st.tm_year-=1900;
    if (st.tm_mon>12) {t=st.tm_mon;st.tm_mon=st.tm_mday;st.tm_mday=t;}
    st.tm_mon-=1;
    tt=mktime(&st);
    if (-1!=tt) {
        strftime(tmpbuf,128,"%Y-%m-%d %H:%M:%S",localtime(&tt));
        return 1;
    } else {
        printf("[%s] is Invalid time string!\n",timstr);
        return 0;
    }
}
int main() {
    strcpy(timstr,"10.01.2012 15:43"        );if (dtparse()) printf("[%s] is [%s]\n",timstr,tmpbuf);
    strcpy(timstr,"8/11/2006 11:10AM"       );if (dtparse()) printf("[%s] is [%s]\n",timstr,tmpbuf);
    strcpy(timstr,"2006/10/31 04:50 PM"     );if (dtparse()) printf("[%s] is [%s]\n",timstr,tmpbuf);
    strcpy(timstr,"1/6/2010 5:20:12 PM"     );if (dtparse()) printf("[%s] is [%s]\n",timstr,tmpbuf);
    strcpy(timstr,"13/12/2012 11:16:17 a.m.");if (dtparse()) printf("[%s] is [%s]\n",timstr,tmpbuf);
    strcpy(timstr,"2013-06-08 09:56:59"     );if (dtparse()) printf("[%s] is [%s]\n",timstr,tmpbuf);
    return 0;
}
//[10.01.2012 15:43] is [2012-10-01 15:43:00]
//[8/11/2006 11:10AM] is [2006-11-08 11:10:00]
//[2006/10/31 04:50 PM] is [2006-10-31 16:50:00]
//[1/6/2010 5:20:12 PM] is [2010-06-01 17:20:12]
//[13/12/2012 11:16:17 a.m.] is [2012-12-13 11:16:17]
//[2013-06-08 09:56:59] is [2013-06-08 09:56:59]
//

Time Functions The following functions are used with time. CompareFileTime DosDateTimeToFileTime FileTimeToDosDateTime FileTimeToLocalFileTime FileTimeToSystemTime GetFileTime GetLocalTime GetSystemTime GetSystemTimeAdjustment GetSystemTimeAsFileTime GetTickCount GetTimeZoneInformation LocalFileTimeToFileTime SetFileTime SetLocalTime SetSystemTime SetSystemTimeAdjustment SetTimeZoneInformation SystemTimeToFileTime SystemTimeToTzSpecificLocalTime Obsolete Functions GetCurrentTime

[「已注销」]

當系統在內部使用通用協調時間或 UTC 為基礎的時間時，應用程式，通常會顯示當地時間或日期與您的時區的時間。不過，開發人員有時候可能需要以程式設計方式將 (先前稱為格林威治標準時間或 GMT) 的 UTC 時間轉換為本地時間。 使用下列的 Win32 函式，就可以完成這項轉換： // Converting UTCTime to LocalTime. FILETIME FileTime, LocalFileTime; SYSTEMTIME UTCTime, LocalTime; SystemTimeToFileTime(&UTCTIme,&FileTime); FileTimeToLocalFileTime(&FileTime, &LocalFileTime); FileTimeToSystemTime(&LocalFileTime, &LocalTime);