"Wed, 21 Jan 1970 19:40:43"

Convert date and time to unixtime.

1798843

Another datetime format string at UTC

YYYYMMDD
19700121

Only TIME
19:40:43

General datetime
1970-01-21 19:40:43Z

For Database
1970-01-21 19:40:43

For HTTP1.1
Wed, 21 Jan 1970 19:40:43 GMT

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