"Tue, 06 Jan 1970 21:38:08"

Convert date and time to unixtime.

509888

Another datetime format string at UTC

YYYYMMDD
19700106

Only TIME
21:38:08

General datetime
1970-01-06 21:38:08Z

For Database
1970-01-06 21:38:08

For HTTP1.1
Tue, 06 Jan 1970 21:38:08 GMT


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