"Sun, 15 Feb 1970 12:03:57"

Convert date and time to unixtime.

3931437

Another datetime format string at UTC

YYYYMMDD
19700215

Only TIME
12:03:57

General datetime
1970-02-15 12:03:57Z

For Database
1970-02-15 12:03:57

For HTTP1.1
Sun, 15 Feb 1970 12:03:57 GMT

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