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🦋 Interval

Here is a bash script to determine the interval between two date/times. Parameters are two dates, specified using any format the date utility can recognize; if the second parameter is omitted, "now" is assumed. Output is the number of seconds between the two, followed by "d h:m:s" format.

 #!/bin/bash
 
 if [ $# -eq 0 ]
 then
         echo Usage: `basename $0` \ \[\\ default \"now\"\] >&2
         exit -1
 fi
 
 start=`date +%s -d "$1"`
 if [ $# -eq 1 ]
 then
         fin=`date +%s`
 else
         fin=`date +%s -d "$2"`
 fi
 
 res=`expr $fin - $start`
 if [ $res -lt 0 ]
 then
         res=`expr 0 - $res`
 fi
 
 echo $res sec
 d=`expr $res / 86400`
 t=`expr $res % 86400`
 h=`expr $t / 3600`
 ms=`expr $t % 3600`
 m=`expr $ms / 60`
 s=`expr $ms % 60`
 if [ $d -gt 0 ]
 then
         echo -n $d day
         if [ $d -gt 1 ]
         then
                 echo -n s
         fi
         echo  -n \
 fi
 if [ $t -gt 0 ]
 then
         echo -n $h\:
         if [ $m -lt 10 ]
         then
                 echo -n 0
         fi
         echo -n $m
         if [ $s -gt 0 ]
         then
                 echo -n \:
                 if [ $s -lt 10 ]
                 then
                         echo -n 0
                 fi
                 echo -n $s
         fi
 fi
 echo
  

posted evening of Sunday, March 11th, 2007
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