DosSetDateTime (OS/2 1.x)

This call is used to set the date and time that are maintained by the operating system.

Syntax
DosSetDateTime (DateTime)

Parameters

 * DateTime (PDATETIME) - input : Address of the date and time structure:
 * hours (UCHAR) - Current hour (0-23)
 * minutes (UCHAR) - Current minute (0-59)
 * seconds (UCHAR) - Current second (0-59)
 * hundredths (UCHAR) - Current hundredth of a second (0-99)
 * day (UCHAR) - Current day (1-31)
 * month (UCHAR) - Current month (1-12)
 * year (USHORT) - Current year (1980-2079)
 * timezone (SHORT) - Minutes west of UTC (Universal Time Coordinate -720 to 720).
 * weekday (UCHAR) - Current day of the week. This value is ignored and is calculated from the other parameter information.

Return Code

 * rc (USHORT) - return:Return code descriptions are:
 * 0 NO_ERROR
 * 327 ERROR_TS_DATETIME

Remarks
The value of timezone is the difference in minutes between the current time zone and UTC. This is a positive number if earlier than UTC, and negative number if it is later. For Eastern Standard Time this value is 300 (five hours earlier than UTC).

To get the date and time, issue DosGetDateTime. 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.

Not adhering to the limits on any of the parameters results in the return code being set to rc = 327 (ERROR_TS_DATETIME). Also, OS/2 verifies that the day is possible for the month and the year (even for leap year). If the day is not reasonable, OS/2 will also set rc = 327.

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;


 * 1) define INCL_DOSDATETIME

USHORT   rc = DosSetDateTime(DateTime); PDATETIME DateTime;     /* Date/time structure */ USHORT   rc;            /* return code */ 

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 DosSetDateTime:FAR INCL_DOSDATETIME   EQU 1

PUSH@ OTHER   DateTime      ;Date/time structure CALL  DosSetDateTime

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. 
 * 1) define INCL_DOSDATETIME
 * 2) include 

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); } 