Question

I have time in epoch format.
I just want to retrieve Year from it.

how should we do it in c or c++ ?

Actually i have time since epoch in seconds and i need to calculate age depending on it.
So input will be seconds since epoch and out put should be Age based on current date.

Thanks,
PP.

Answer 1

In C timestamps (ie: seconds from epoch) are usually stored in time_t, while human-wise dates are stored in structure tm. You need a function that converts time_ts in tms.

gmtime or localtime are two C standard function that do your job.

struct tm *date = gmtime( your_time );
printf( "Year = %d\n", date->tm_year );

Warning that these functions are not thread-safe. You’ll find a reentrant version on POSIX systems (linux, mac os x, …): gmtime_r and localtime_r