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892天前#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 (number 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; |
} |
