date command
From thelinuxwiki
to get a formatted date command, just append a + followed by format denotations. Just type in what characters you want to divide the parameters by. Dash, dot, ect...
just give me the year!
# date +%Y 2013
year, month, day...
# date +%Y-%m-%d ~ 2013-08-01
just give me the time!
# date +%H.%M.%S ~ 23.00.20
epoch conversion
current date in epoch
$ date +%s 1505537832
date string to epoch
$ date -d '15Sep2017' +%s 1505451600
epoch to human readable date
$ date -d @1505537832 +%Y-%m-%d 2017-09-15
