"Sun, 11 Jan 1970 00:40:12"

Convert date and time to unixtime.

866412

Another datetime format string at UTC

YYYYMMDD
19700111

Only TIME
00:40:12

General datetime
1970-01-11 00:40:12Z

For Database
1970-01-11 00:40:12

For HTTP1.1
Sun, 11 Jan 1970 00:40:12 GMT

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