"Thu, 08 Jan 1970 04:42:40"

Convert date and time to unixtime.

621760

Another datetime format string at UTC

YYYYMMDD
19700108

Only TIME
04:42:40

General datetime
1970-01-08 04:42:40Z

For Database
1970-01-08 04:42:40

For HTTP1.1
Thu, 08 Jan 1970 04:42:40 GMT

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