date-diff
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	#!/bin/bash

	PARM=2

	if [ $# -ne $PARM ]
	then
	echo "Wrong # param. Need $PARM got $# "
	echo "Usage: ./this end_date(one_string) start_date(one_string)"
	exit
	fi

	# Prepend '20' to the 2-digit year to avoid ambiguity
	D1="20"$1
	D2="20"$2

	#echo $D1
	#echo $D2
	echo $((`date +'%s' -d "$D1" `-`date +'%s' -d "$D2"`))