DosGetDateTime (OS/2 1.x)

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This call gets the current date and time maintained by the operating system.

Syntax

DosGetDateTime (DateTime)

Parameters

DateTime (PDATETIME) - output 
Address of the date and time structure.

Return Code

rc (USHORT) - return
Return code description is:
  • 0 NO_ERROR

Remarks

The dayofweek value is based on Sunday equal to zero. The value of timezone is the difference in minutes between the current time zone and UTC. This number is positive if it is earlier than UTC and negative if it is later than UTC. For Eastern Standard Time, this value is 300 (5 hours earlier than UTC).

If the application is executing in the OS/2 environment, it is more efficient to obtain these variables by calling DosGetInfoSeg instead of this function. However, applications written to the family API cannot depend on the availability of DosGetInfoSeg.

Bindings

C

typedef struct _DATETIME {  /* date */
  UCHAR   hours;            /* current hour */
  UCHAR   minutes;          /* current minute */
  UCHAR   seconds;          /* current second */
  UCHAR   hundredths;       /* current hundredths of a second */
  UCHAR   day;              /* current day */
  UCHAR   month;            /* current month */
  USHORT  year;             /* current year */
  SHORT   timezone;         /* minutes of time west of UTC */
  UCHAR   weekday;          /* current day of week */ 
} DATETIME;

#define INCL_DOSDATETIME

USHORT    rc = DosGetDateTime(DateTime);
PDATETIME DateTime;      /* Address of date/time structure (returned) */
USHORT    rc;            /* return code */

This example gets the current time and date.

#define INCL_DOSDATETIME

DATETIME DateBuffer;
USHORT   rc;

rc = DosGetDateTime(&DateBuffer);        /* Date/Time structure */

MASM

DATETIME struc
  date_hours      db  ? ;current hour
  date_minutes    db  ? ;current minute
  date_seconds    db  ? ;current second
  date_hundredths db  ? ;current hundredths of a second
  date_day        db  ? ;current day
  date_month      db  ? ;current month
  date_year       dw  ? ;current year
  date_timezone   dw  ? ;minutes of time west of UTC
  date_weekday    db  ? ;current day of week
DATETIME ends

EXTRN  DosGetDateTime:FAR
INCL_DOSDATETIME    EQU 1

PUSH@  OTHER   DateTime      ;Date/time structure (returned)
CALL   DosGetDateTime

Returns WORD

Example

The following example obtains and prints date and time information. It then changes the system date to 5/10/1987 and prints the updated information.

#define INCL_DOSDATETIME
#include <os2.h>

main()
{
  DATETIME   DateTime;       /* Structure to hold date/time info. */
  USHORT     rc;

  rc = DosGetDateTime(&DateTime);     /* Address of d/t structure */
  printf("Today is %d-%d-%d; the time is %d:%d\n", DateTime.month,
         DateTime.day, DateTime.year, DateTime.hours, DateTime.minutes);
  DateTime.day = 10;
  DateTime.month = 5;
  DateTime.year = 1987;
  printf("The new date is %d-%d-%d; the time is %d:%d\n", DateTime.month,
         DateTime.day, DateTime.year, DateTime.hours, DateTime.minutes);
  rc = DosSetDateTime(&DateTime);    /* Address of d/t structure */
  printf("rc is %d\n", rc);
 }

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