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Full Discussion: date difference
Operating Systems Linux date difference Post 302176132 by era on Monday 17th of March 2008 12:08:10 PM
Old 03-17-2008
It's possible but it would help if you could say which time zone the second one is.

The standard solution would be to convert them both to a canonical format (maybe epoch, that is, seconds since Jan 1 1970) and then the problem is just how to format the result back as a human-readable time expression. In what form would you like the output?

I would use Perl or Python because they come with handy libraries which can do the grunt work for you.
era
 

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function::ctime

FUNCTION:(3stap)					      Time utility functions						  FUNCTION:(3stap)

NAME
function::ctime - Convert seconds since epoch into human readable date/time string SYNOPSIS
ctime:string(epochsecs:long) ARGUMENTS
epochsecs Number of seconds since epoch (as returned by gettimeofday_s) DESCRIPTION
Takes an argument of seconds since the epoch as returned by gettimeofday_s. Returns a string of the form "Wed Jun 30 21:49:08 1993" The string will always be exactly 24 characters. If the time would be unreasonable far in the past (before what can be represented with a 32 bit offset in seconds from the epoch) the returned string will be "a long, long time ago...". If the time would be unreasonable far in the future the returned string will be "far far in the future..." (both these strings are also 24 characters wide). Note that the epoch (zero) corresponds to "Thu Jan 1 00:00:00 1970" The earliest full date given by ctime, corresponding to epochsecs -2147483648 is "Fri Dec 13 20:45:52 1901". The latest full date given by ctime, corresponding to epochsecs 2147483647 is "Tue Jan 19 03:14:07 2038". The abbreviations for the days of the week are 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', and 'Sat'. The abbreviations for the months are 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', and 'Dec'. Note that the real C library ctime function puts a newline (' ') character at the end of the string that this function does not. Also note that since the kernel has no concept of timezones, the returned time is always in GMT. SystemTap Tapset Reference May 2013 FUNCTION:(3stap)
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