"Fri, 20 Feb 1970 18:16:11"

Convert date and time to unixtime.

4385771

Another datetime format string at UTC

YYYYMMDD
19700220

Only TIME
18:16:11

General datetime
1970-02-20 18:16:11Z

For Database
1970-02-20 18:16:11

For HTTP1.1
Fri, 20 Feb 1970 18:16:11 GMT

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