"Tue, 20 Jan 1970 21:44:23"

Convert date and time to unixtime.

1719863

Another datetime format string at UTC

YYYYMMDD
19700120

Only TIME
21:44:23

General datetime
1970-01-20 21:44:23Z

For Database
1970-01-20 21:44:23

For HTTP1.1
Tue, 20 Jan 1970 21:44:23 GMT

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