> unixtodos() in c ~ Online tutorial

unixtodos() in c


 unixtodos()

 Converts date and time from UNIX to DOS format

 Declaration:

   void unixtodos(long time, struct date *d, struct time *t);

 Remarks:

unixtodos converts the UNIX-format time given in time to DOS format and
fills in the date and time structures *d and *t.

 Return Value:
None


 Example:

 #include <stdio.h>
 #include <dos.h>

 char *month[] = {"---", "Jan", "Feb", "Mar", "Apr", "May", "Jun",
                         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

 #define SECONDS_PER_DAY 86400L  /* the number of seconds in one day */

 struct date dt;
 struct time tm;

 int main(void)
 {
    unsigned long val;

 /* get today's date and time */
    getdate(&dt);
    gettime(&tm);
    printf("today is %d %s %d\n", dt.da_day, month[dt.da_mon], dt.da_year);

 /*convert date and time to unix format (num of seconds since Jan 1, 1970*/
    val = dostounix(&dt, &tm);
 /* subtract 42 days worth of seconds */
    val -= (SECONDS_PER_DAY * 42);

 /* convert back to dos time and date */
    unixtodos(val, &dt, &tm);
    printf("42 days ago it was %d %s %d\n",
           dt.da_day, month[dt.da_mon], dt.da_year);
    return 0;
 }

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