Actually my script has problems, it overflows much earlier than it should be. Here's an updated one:
s1=`date -d $1 +%s`
s2=`date -d $2 +%s`
echo "Days: " $(($day2 - $day1))
But like I said it can only calculate from 1902 - 2038. I'll try to come up one with awk (why I didn't think of that? stupid me) if I have time. But I have to deal with leap year myself I guess.
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