I have this really nice rsync backup script that I use to do rotating snapshot backups of my different Ubuntu servers to a single backup server. I am now trying to use this same script on my Leopard machine, but it seems to have a serious problem with the following lines of code: lday=`date +'image-%Y-%m-%d-%H' -d '1 day ago'` lweek=`date +'image-%Y-%m-%d-%H' -d '1 week ago'` The generate the following error: date: illegal time format usage: date [-jnu] [-d dst] [-r seconds] [-t west] [-v[+|-]val[ymwdHMS]] ... [-f fmt date | [[[mm]dd]HH]MM[[cc]yy][.ss]] [+format] It's clear that it doesn't like the -d '1 day ago' part in my code. Is this solved differently in Leopard? Could someone please help me out? I've be trying to research this for the past 8 hours, but can't seem to find any solution to this problem. Thanks in advance.