"Sun, 04 Jan 1970 21:13:40"

Convert date and time to unixtime.

335620

Another datetime format string at UTC

YYYYMMDD
19700104

Only TIME
21:13:40

General datetime
1970-01-04 21:13:40Z

For Database
1970-01-04 21:13:40

For HTTP1.1
Sun, 04 Jan 1970 21:13:40 GMT

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