"Sat, 21 Feb 1970 18:16:01"

Convert date and time to unixtime.

4472161

Another datetime format string at UTC

YYYYMMDD
19700221

Only TIME
18:16:01

General datetime
1970-02-21 18:16:01Z

For Database
1970-02-21 18:16:01

For HTTP1.1
Sat, 21 Feb 1970 18:16:01 GMT

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