Fun with date
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The date(1) command is capable of many things.
Convert an epoch (unix time) into something a human can make sense of
date --date='@2147483647'
Print yesterday's date. Handy for monthly cronjobs scheduled on day 1 but need to get the date of the last day prior month
date --date='1 day ago' Wed Sep 2 11:01:35 PDT 2015