I have a time-stamp like 7:00:00, which means 7am.
I would like to write a short command that returns 06:45:00, or simply 06:45, preferably using date command so that I can avoid long shell script. Do you have any elegant solution?
7:00:00 AM - 15 minutes as
--date) string :
% date -d '7:00:00 AM - 15 minutes' '+%H:%M' 06:45
+%H:%M sets the output format as