(tar)Date input formats

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Date input formats
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   This section describes the textual date representations that GNU
programs accept.  These are the strings you, as a user, can supply as
arguments to the various programs.  The C interface (via the `getdate'
function) is not described here.

   Although the date syntax here can represent any possible time since
zero A.D., computer integers are not big enough for such a
(comparatively) long time.  The earliest date semantically allowed on
Unix systems is midnight, 1 January 1970 UCT.

General date syntax

Calendar date item

Time of day item

Timezone item

Day of week item

Relative item in date strings

Pure numbers in date strings

Authors of getdate