subtract 1 hour from date in unix shell script

Question

I have the following in a shell script. How can I subtract one hour while retaining the formatting?

DATE=`date "+%m/%d/%Y -%H:%M:%S"`

Answer 1

If you need change timezone before subtraction with new format too:

$(TZ=US/Eastern date -d '1 hour ago' '+%Y-%m-%d %H:%M')