"Sat, 03 Jan 1970 19:45:40"

Convert date and time to unixtime.

243940

Another datetime format string at UTC

YYYYMMDD
19700103

Only TIME
19:45:40

General datetime
1970-01-03 19:45:40Z

For Database
1970-01-03 19:45:40

For HTTP1.1
Sat, 03 Jan 1970 19:45:40 GMT

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