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Gets the system time. t is a storage. msdn example: /**//* TIMES.C illustrates various time and date functions including: 
* time _ftime ctime asctime * localtime gmtime mktime _tzset * _strtime _strdate strftime * * Also the global variable: * _tzname 
*/ #include <time.h> #include <stdio.h> #include <sys/types.h> #include <sys/timeb.h> #include <string.h> void main() 
{ char tmpbuf[128], ampm[] = "AM"; time_t ltime; struct _timeb tstruct; 
struct tm *today, *gmt, xmas = { 0, 0, 12, 25, 11, 93 }; /**//* Set time zone from TZ environment variable. If TZ is not set, * the operating system is queried to obtain the default value * for the variable. 
*/ _tzset(); /**//* Display operating system-style date and time. */ _strtime( tmpbuf ); printf( "OS time:\t\t\t\t%s\n", tmpbuf ); _strdate( tmpbuf ); printf( "OS date:\t\t\t\t%s\n", tmpbuf ); /**//* Get UNIX-style time and display as number and string. */ time( <ime ); printf( "Time in seconds since UTC 1/1/70:\t%ld\n", ltime ); printf( "UNIX time and date:\t\t\t%s", ctime( <ime ) ); /**//* Display UTC. */ gmt = gmtime( <ime ); printf( "Coordinated universal time:\t\t%s", asctime( gmt ) ); /**//* Convert to time structure and adjust for PM if necessary. */ today = localtime( <ime ); if( today->tm_hour > 12 ) { strcpy( ampm, "PM" ); today->tm_hour -= 12; } if( today->tm_hour == 0 ) /**//* Adjust if midnight hour. */ today->tm_hour = 12; /**//* Note how pointer addition is used to skip the first 11 * characters and printf is used to trim off terminating * characters. */ printf( "12-hour time:\t\t\t\t%.8s %s\n", asctime( today ) + 11, ampm ); /**//* Print additional time information. */ _ftime( &tstruct ); printf( "Plus milliseconds:\t\t\t%u\n", tstruct.millitm ); printf( "Zone difference in seconds from UTC:\t%u\n", tstruct.timezone ); printf( "Time zone name:\t\t\t\t%s\n", _tzname[0] ); printf( "Daylight savings:\t\t\t%s\n", tstruct.dstflag ? "YES" : "NO" ); /**//* Make time for noon on Christmas, 1993. */ if( mktime( &xmas ) != (time_t)-1 ) printf( "Christmas\t\t\t\t%s\n", asctime( &xmas ) ); /**//* Use time structure to build a customized time string. */ today = localtime( <ime ); /**//* Use strftime to build a customized time string. */ strftime( tmpbuf, 128, "Today is %A, day %d of %B in the year %Y.\n", today ); printf( tmpbuf ); } Output OS time: 21:51:03 OS date: 05/03/94 Time in seconds since UTC 1/1/70: 768027063 UNIX time and date: Tue May 03 21:51:03 1994 Coordinated universal time: Wed May 04 04:51:03 1994 12-hour time: 09:51:03 PM Plus milliseconds: 279 Zone difference in seconds from UTC: 480 Time zone name: Daylight savings: YES Christmas Sat Dec 25 12:00:00 1993 Today is Tuesday, day 03 of May in the year 1994.