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Full Discussion: Unix function to calcuate the difference in time
Top Forums Shell Programming and Scripting Unix function to calcuate the difference in time Post 302143621 by aigles on Friday 2nd of November 2007 07:00:01 AM
Old 11-02-2007
You must write your own function.
You can do something like that (bash or ksh solution) :
Code:
shopt -s extglob # Bash Only

diff_times()
{
   local time1=$1
   local time2=$2
   typeset -i t1 t2 t

   if [[ "$time1" != ?([0-9])[0-9]:?([0-9])[0-9] ]]
   then
      echo "Invalid time '${time1}'" 1>&2
      return 1
   fi

   if [[ "$time2" != ?([0-9])[0-9]:?([0-9])[0-9] ]]
   then
      echo "Invalid time '${time2}'" 1>&2
      return 1
   fi

   (( t1 = ${time1%:*} * 60 + ${time1#*:} ))
   (( t2 = ${time2%:*} * 60 + ${time2#*:} ))
   (( t = t2 - t1 ))
   if (( t <0 ))
   then
      (( t = -t ))
   fi

   echo $t
}

start="19:22"
end="19:43"
echo "Difference between $start and $end is $(diff_times "$start" "$end")"

Output :
Code:
Difference between 19:22 and 19:43 is 21

Jean-Pierre.
 

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LEARN ABOUT CENTOS

difftime

DIFFTIME(3)						     Linux Programmer's Manual						       DIFFTIME(3)

NAME

       difftime - calculate time difference

SYNOPSIS

       #include <time.h>

       double difftime(time_t time1, time_t time0);

DESCRIPTION

       The  difftime()	function  returns  the	number of seconds elapsed between time time1 and time time0, represented as a double.  Each of the
       times is specified in calendar time, which means its value is a measurement (in seconds) relative to the Epoch, 1970-01-01  00:00:00  +0000
       (UTC).

CONFORMING TO

       SVr4, 4.3BSD, C89, C99.

NOTES

       On a POSIX system, time_t is an arithmetic type, and one could just define

	      #define difftime(t1,t0) (double)(t1 - t0)

       when the possible overflow in the subtraction is not a concern.

SEE ALSO

       date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)

COLOPHON

       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2012-12-22							       DIFFTIME(3)
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