To show current Date and Time in a program just use “localtime()” function.

Calculation of day, month and year is explained.

PROGRAM:

#include <time.h>
time_t theTime = time(NULL);
struct tm *aTime = localtime(&theTime);
int day = aTime->tm_mday;
int month = aTime->tm_mon + 1; // Month is 0 - 11, add 1 to get a jan-dec 1-12 concept
int year = aTime->tm_year + 1900; // Year is # years since 1900