How to convert DATE to UNIX TIMESTAMP in shell script on MacOS

Question

On Linux you can convert a date like \"2010-10-02\" to a unix timestamp in shell script by

date -d \"2010-10-02\" \"+%s\"

Since Mac OS does not

Answer 1

date -j -f "%Y-%m-%d %H:%M:%S" "2020-04-07 00:00:00" "+%s"

It will print the dynamic seconds when without %H:%M:%S and 00:00:00.