"Sat, 03 Jan 1970 14:10:20"

Convert date and time to unixtime.

223820

Another datetime format string at UTC

YYYYMMDD
19700103

Only TIME
14:10:20

General datetime
1970-01-03 14:10:20Z

For Database
1970-01-03 14:10:20

For HTTP1.1
Sat, 03 Jan 1970 14:10:20 GMT

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