"Tue, 20 Jan 1970 00:54:33"

Convert date and time to unixtime.

1644873

Another datetime format string at UTC

YYYYMMDD
19700120

Only TIME
00:54:33

General datetime
1970-01-20 00:54:33Z

For Database
1970-01-20 00:54:33

For HTTP1.1
Tue, 20 Jan 1970 00:54:33 GMT

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