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TIMES.C
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─────Run-Time Library───────────────────────────────────────────────────────
/* 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, 91 };
/* Set time zone from TZ environment variable. If TZ is not set,
* PST8PDT is used (Pacific standard time, daylight savings).
*/
_tzset();
/* Display DOS-style date and time. */
_strtime( tmpbuf );
printf( "DOS time:\t\t\t\t%s\n", tmpbuf );
_strdate( tmpbuf );
printf( "DOS 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 GMT 1/1/70:\t%ld\n", ltime );
printf( "UNIX time and date:\t\t\t%s", ctime( <ime ) );
/* Display GMT. */
gmt = gmtime( <ime );
printf( "Greenwich Mean Time:\t\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;
}
/* 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 GMT:\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, 1988. */
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 );
}
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