Returns the number of seconds since January 1st, 1970, Midnight, in Greenwich (GMT). Also known as "Unix time", "timestamp" or "epoch".

Example:

 clock seconds

on Dec 10 2004, 11:44:22, returns

 1102686262

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See also: [clock]

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[LV] Is the epoch the same on all platforms and operating systems?

[KBK] - If it isn't, that's a bug.  The epoch is 1970-01-01T00:00:00Z - that is, 00:00 UTC at the start of 1 January 1970.
It was once true that MacOS9 and below used a different epoch, but that proved to be too confusing for everyone.

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[RS]: Find out what your epoch is, without timezone offset, with
 clock format 0 -gmt 1
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[[
[Category Command]
|
[Category Date and Time]
]]