Heure AM/PM en français

$ cat foo.sh
#! /bin/bash

while read line
do
case "$(egrep -o "AM|PM" <<<${line})" in
AM)     sed -i "/${line}/ s/.\(.:..\).*/\1/" plop
        ;;
PM)    sed -i "/${line}/ s//date -d \"${line}\" +%R/e" plop
        ;;
esac
done < plop

$ cat plop
Wed 11/21/2007
05:12 PM
25
Wed 11/21/2007
05:14 PM
26
Thu 11/22/2007
09:04 AM
8

$ ./foo.sh
$ cat plop
Wed 11/21/2007
17:12
25
Wed 11/21/2007
17:14
26
Thu 11/22/2007
9:04
8