"Sun, 15 Feb 1970 00:20:21"

Convert date and time to unixtime.

3889221

Another datetime format string at UTC

YYYYMMDD
19700215

Only TIME
00:20:21

General datetime
1970-02-15 00:20:21Z

For Database
1970-02-15 00:20:21

For HTTP1.1
Sun, 15 Feb 1970 00:20:21 GMT

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