#!/bin/bash

if [ $# != 1 ]; then
	echo "usage: $0 <date>"
	exit 1;
fi

trap "tput cnorm; echo ""; exit" sigint
tput civis

birthtime=`date -d"$1" +'%s'`
while true; do
	seconds=`date -d"now -$birthtime seconds" +'%s'`
	printf "\rseconds since $1: %12d" $seconds;
	tput el
	sleep .1
done