"Tue, 17 Feb 1970 19:40:38"

Convert date and time to unixtime.

4131638

Another datetime format string at UTC

YYYYMMDD
19700217

Only TIME
19:40:38

General datetime
1970-02-17 19:40:38Z

For Database
1970-02-17 19:40:38

For HTTP1.1
Tue, 17 Feb 1970 19:40:38 GMT

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