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Microsoft OS/2 SDK 03-01-1988

/*
 * Example of DosGetDateTime & DosSetDateTime usage
 *
 * These calls are used to set and get the current system time.
 * Also shows the structure of the information returned.
 *
 *     - on an IBM AT, DosSetDateTime changes the hardware real time clock
 *     - the system sets the 'timezone' value to -1 by default
 *
 * Compile as: cl -AL -G0 -Lp datetime.c
 *
 * Created by Microsoft Corp. 1986
 */

#define INCL_DOSDATETIME

#include  <os2def.h>
#include  <bsedos.h>

main()
{
    DATETIME curdt, newdt, setdt;

    /* Read current date and time */
    DosGetDateTime(&curdt);

    /* Print date and time */
    printf("TIME: %d:%02d:%02d.%02d  DATE: %d/%d/%d  DAY OF WEEK: %d\n",
	curdt.hours,curdt.minutes,curdt.seconds,curdt.hundredths,
	curdt.month,curdt.day,curdt.year,curdt.weekday);
    /* NOTE: the system sets the 'timezone' value to -1 by default */
    printf("GMT = local_time %+d minutes\n",curdt.timezone);


    /* Set datetime struct to Thursday 12/25/86, 9:02:45.01pm PST */
    setdt.hours 	=   21; /* Time is in 24 hour format */
    setdt.minutes       =    2;
    setdt.seconds       =   45;
    setdt.hundredths    =    1;
    setdt.day           =   25;
    setdt.month         =   12;
    setdt.year          = 1986; /* Year should include the century */
    setdt.timezone      =  480; /* PST is 8 hours after GMT (480 minutes) */

    /* Set system date and time */
    DosSetDateTime(&setdt);

    /* Read new date and time just set */
    DosGetDateTime(&newdt);

    /* Print date and time */
    printf("TIME: %d:%02d:%02d.%02d  DATE: %d/%d/%d  DAY OF WEEK: %d\n",
	newdt.hours,newdt.minutes,newdt.seconds,newdt.hundredths,
	newdt.month,newdt.day,newdt.year,newdt.weekday);
    printf("GMT = local_time %+d minutes\n",newdt.timezone);

    /* Reset date and time to whatever was read at the beginning */
    DosSetDateTime(&curdt);
}

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