"Mon, 09 Feb 1970 14:45:21"

Convert date and time to unixtime.

3422721

Another datetime format string at UTC

YYYYMMDD
19700209

Only TIME
14:45:21

General datetime
1970-02-09 14:45:21Z

For Database
1970-02-09 14:45:21

For HTTP1.1
Mon, 09 Feb 1970 14:45:21 GMT

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