SYSTEMTIME 与 time_t 之间的转换，计算2个SYSTEMTIME的时间差

Posted 2020-10-29 findumars

[cpp] view plain copy

 

1. time_t systemtime_to_time_t(const SYSTEMTIME& st)  
2. {  
3.     struct tm gm = {st.wSecond, st.wMinute, st.wHour, st.wDay, st.wMonth-1, st.wYear-1900, st.wDayOfWeek, 0, 0};  
4.     return mktime(&gm);  
5. }  
6.   
7. SYSTEMTIME time_t_to_systemtime(time_t t)  
8. {  
9.     tm temptm = *localtime(&t);  
10.     SYSTEMTIME st = {1900 + temptm.tm_year,   
11.         1 + temptm.tm_mon,   
12.         temptm.tm_wday,   
13.         temptm.tm_mday,   
14.         temptm.tm_hour,   
15.         temptm.tm_min,   
16.         temptm.tm_sec,   
17.         0};  
18.     return st;  
19. }  
20. 
    
    

https://blog.csdn.net/hellokandy/article/details/51329446

 

MFC版本的计算两个SYSTEMTIME之间的时间差，返回毫秒：

 

[cpp] view plain copy

 

1. __int64 TimeDiff(SYSTEMTIME left, SYSTEMTIME right)    
2. {  
3.     CTime tmLeft(left.wYear, left.wMonth, left.wDay, 0, 0, 0);  
4.     CTime tmRight(right.wYear, right.wMonth, right.wDay, 0, 0, 0);  
5.       
6.     CTimeSpan sp = tmLeft - tmRight;  
7.     long MillisecondsL = (left.wHour*3600 + left.wMinute*60 + left.wSecond)*1000 + left.wMilliseconds;    
8.     long MillisecondsR = (right.wHour*3600 + right.wMinute*60 + right.wSecond)*1000 + right.wMilliseconds;    
9.   
10.     return  (__int64)sp.GetDays()*86400000 + (MillisecondsL - MillisecondsR);//此处返回毫秒  
11. }  

https://blog.csdn.net/hellokandy/article/details/51329183