"Tue, 20 Jan 1970 21:13:14"

Convert date and time to unixtime.

1717994

Another datetime format string at UTC

YYYYMMDD
19700120

Only TIME
21:13:14

General datetime
1970-01-20 21:13:14Z

For Database
1970-01-20 21:13:14

For HTTP1.1
Tue, 20 Jan 1970 21:13:14 GMT

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