"Sat, 21 Feb 1970 00:53:43"

Convert date and time to unixtime.

4409623

Another datetime format string at UTC

YYYYMMDD
19700221

Only TIME
00:53:43

General datetime
1970-02-21 00:53:43Z

For Database
1970-02-21 00:53:43

For HTTP1.1
Sat, 21 Feb 1970 00:53:43 GMT

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