Unix Timestamp

Seconds since 1^st January 1970 UTC

Milliseconds

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What is a Unix Timestamp?

A Unix timestamp is a measurement of time in seconds since 1^st January, 1970 UTC, the Unix Epoch.

Unix timestamps can be recorded in milliseconds for greater precision and are measured in non-leap seconds.

What is Unix Time?

Unix time is the time standard for Unix operating systems. It is now an industry standard and widely used in other computer systems and software.

What is UTC?

Coordinated Universal Time (UTC) is the global time standard used to set time zones and civil time.

The UTC standard is defined by the International Telecommunication Union, an agency of the United Nations.

What are leap-seconds?

Leap seconds are one-second adjustments to Coordinated Universal Time (UTC) to compensate for differences between atomic time and solar time caused by changes to the earths rotation.

UTC is based on atomic time, a consistent and high precision time standard determined by measuring atoms. Solar time is based on the rotation of the earth around the sun which is less precise and varies due to factors such as tidal forces.

To keep UTC within 0.9 seconds of solar time, leap seconds are applied when necessary.

Leap seconds are applied at irregular intervals since changes to earths rotation are hard to predict.