"Wed, 21 Jan 1970 19:39:21"

Convert date and time to unixtime.

1798761

Another datetime format string at UTC

YYYYMMDD
19700121

Only TIME
19:39:21

General datetime
1970-01-21 19:39:21Z

For Database
1970-01-21 19:39:21

For HTTP1.1
Wed, 21 Jan 1970 19:39:21 GMT

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