"Fri, 30 Jan 1970 12:33:41"

Convert date and time to unixtime.

2550821

Another datetime format string at UTC

YYYYMMDD
19700130

Only TIME
12:33:41

General datetime
1970-01-30 12:33:41Z

For Database
1970-01-30 12:33:41

For HTTP1.1
Fri, 30 Jan 1970 12:33:41 GMT

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