"Sat, 03 Jan 1970 07:48:23"

Convert date and time to unixtime.

200903

Another datetime format string at UTC

YYYYMMDD
19700103

Only TIME
07:48:23

General datetime
1970-01-03 07:48:23Z

For Database
1970-01-03 07:48:23

For HTTP1.1
Sat, 03 Jan 1970 07:48:23 GMT

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