Enter either Unixtime (UTC) or year / month / day / hour / minute / second specification (JST) and press convert.

Unixtime ????????
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What is Unixtime?

Unixtime is one of the representation formats of time on a computer. Also called Unix Epoch Time. This page converts human-readable time to Unixtime and vice versa.

This is the number of seconds that have elapsed since 0: 00: 00: 01 on January 1,1970 UTC. Note that Japan time is UTC time + 9 hours,so when Unixtime is 0,Japan time will be 9:00:00 on January 1,1970.