Bash : converting unix timestamp to date

Under Debian or RHEL4 and later, it can be as simple as :

$ date -d @1193144433
Tue Oct 23 15:00:33 CEST 2007

But that command doesn’t work under Redhat EL 3, so you should use the following :

$ date --date "1970-01-01 1193144433 sec" "+%Y-%m-%d %T"
2007-10-23 15:00:33

The output is different though

You can always use the previous command under Ubuntu/RHEL4+ or the simpler :

$ date -d @1193144433 "+%Y-%m-%d %T"
2007-10-23 15:00:33

Converting a date to unix timestamp :

$ date -d "2007-10-23 15:00:23" "+%s"
1193144423

Add "--utc" to the commands if you want to get the UTC time.