"Sun, 15 Feb 1970 00:20:35"

Convert date and time to unixtime.

3889235

Another datetime format string at UTC

YYYYMMDD
19700215

Only TIME
00:20:35

General datetime
1970-02-15 00:20:35Z

For Database
1970-02-15 00:20:35

For HTTP1.1
Sun, 15 Feb 1970 00:20:35 GMT

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