"Sat, 17 Jan 1970 21:10:39"

Convert date and time to unixtime.

1458639

Another datetime format string at UTC

YYYYMMDD
19700117

Only TIME
21:10:39

General datetime
1970-01-17 21:10:39Z

For Database
1970-01-17 21:10:39

For HTTP1.1
Sat, 17 Jan 1970 21:10:39 GMT

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