"Sun, 15 Feb 1970 15:05:56"

Convert date and time to unixtime.

3942356

Another datetime format string at UTC

YYYYMMDD
19700215

Only TIME
15:05:56

General datetime
1970-02-15 15:05:56Z

For Database
1970-02-15 15:05:56

For HTTP1.1
Sun, 15 Feb 1970 15:05:56 GMT

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