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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 SUNOS

difftime

difftime(3C)						   Standard C Library Functions 					      difftime(3C)

NAME

       difftime - computes the difference between two calendar times

SYNOPSIS

       #include <time.h>

       double difftime(time_t time1, time_t time0);

DESCRIPTION

       The difftime() function computes the difference between two  calendar times.

RETURN VALUES

       The difftime() functions returns the difference (time1-time0) expressed in seconds as a double.

USAGE

       The difftime() function is provided because there are no general arithmetic properties defined for type time_t.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ctime(3C), attributes(5), standards(5)

SunOS 5.10							    24 Jul 2002 						      difftime(3C)
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