"Tue, 06 Jan 1970 20:35:21"

Convert date and time to unixtime.

506121

Another datetime format string at UTC

YYYYMMDD
19700106

Only TIME
20:35:21

General datetime
1970-01-06 20:35:21Z

For Database
1970-01-06 20:35:21

For HTTP1.1
Tue, 06 Jan 1970 20:35:21 GMT

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