converting between unix time and date

I've recently been looking at reporting in OpenNMS and it seems that some of the reports require date ranges to be specified in unix time. Now, I don't know about you, but my mental ability to translate "April 26, 2011 15:00 UTC" to 1303830000 is sadly lacking. So, here are some useful commands to convert from unix time to date and vice versa:

Date to Unix time:

# current timestamp date +%s

# specific timestamp date -d '2011-04-26 15:00:00' +%s

# same thing but UTC date -u +%s date -u -d '2011-04-26 15:00:00' +%s

Unix time to date:

date -d @1303826400

# same thing but UTC date -u -d @1303826400

Comments

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Robin Bowes

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