#!/bin/sed -Ef

s/^([0-9]{1,2})-Jan-([0-9]{4})$/\2\/01\/\1/
s/^([0-9]{1,2})-Feb-([0-9]{4})$/\2\/02\/\1/
s/^([0-9]{1,2})-Mar-([0-9]{4})$/\2\/03\/\1/
s/^([0-9]{1,2})-Apr-([0-9]{4})$/\2\/04\/\1/
s/^([0-9]{1,2})-May-([0-9]{4})$/\2\/05\/\1/
s/^([0-9]{1,2})-Jun-([0-9]{4})$/\2\/06\/\1/
s/^([0-9]{1,2})-Jul-([0-9]{4})$/\2\/07\/\1/
s/^([0-9]{1,2})-Aug-([0-9]{4})$/\2\/08\/\1/
s/^([0-9]{1,2})-Sep-([0-9]{4})$/\2\/09\/\1/
s/^([0-9]{1,2})-Oct-([0-9]{4})$/\2\/10\/\1/
s/^([0-9]{1,2})-Nov-([0-9]{4})$/\2\/11\/\1/
s/^([0-9]{1,2})-Dec-([0-9]{4})$/\2\/12\/\1/