"Thu, 08 Jan 1970 12:31:40"

Convert date and time to unixtime.

649900

Another datetime format string at UTC

YYYYMMDD
19700108

Only TIME
12:31:40

General datetime
1970-01-08 12:31:40Z

For Database
1970-01-08 12:31:40

For HTTP1.1
Thu, 08 Jan 1970 12:31:40 GMT


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