topic Re: Time and date calculation in Operating System - Linux

Time and date calculation

Henry Chua — Wed, 20 Jul 2005 04:47:28 GMT

Hi Guys,

I need to write a program in C or shell to calculate the time interval between 2 timing... e.g.

Start=07/08/2005,14:05:29
End =07/08/2005,16:28:46

What i find difficult is if say start is at 29/02/2005 and end is at 1/03/2005.. how can i know how many days in between this 2?

Is there anyway?

Thank u.

Re: Time and date calculation

Leif Halvarsson_2 — Wed, 20 Jul 2005 04:54:46 GMT

Hi,

Have you looked at Clay Stephenssons "Date Hammer" ?
You can find it here:
http://www.cmve.net/~merijn/

Re: Time and date calculation

A. Clay Stephenson — Wed, 20 Jul 2005 07:28:36 GMT

In C, you fill out a struct tm variable for each of the times and then call mktime() for each to give you time_t seconds for each. These values represent seconds since 1-Jan-1970 00:00:00 UTC. Find the difference between these two time_t values and divide by 86400 and you have the number of days different. Man mktime for details.