"Sun, 18 Jan 1970 21:45:55"

Convert date and time to unixtime.

1547155

Another datetime format string at UTC

YYYYMMDD
19700118

Only TIME
21:45:55

General datetime
1970-01-18 21:45:55Z

For Database
1970-01-18 21:45:55

For HTTP1.1
Sun, 18 Jan 1970 21:45:55 GMT

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