c++ 获取当前时间周初凌晨时间戳（获取当前时间周日凌晨时间戳）

#include<windows.h>
#include <time.h>

int GetWeekBegin(UINT iTmpStamp, UINT& iStamp)
{
　　time_t tick = static_cast<time_t>(iTmpStamp);
　　struct tm t_tm;
　　localtime_s(&t_tm, &tick);
　　t_tm.tm_hour = 0;
　　t_tm.tm_min = 0;
　　t_tm.tm_sec = 0;
　　iStamp = static_cast<UINT>(mktime(&t_tm)) - t_tm.tm_wday * 24 * 60 * 60;
　　return TRUE;
}