"Thu, 08 Jan 1970 09:18:21"

Convert date and time to unixtime.

638301

Another datetime format string at UTC

YYYYMMDD
19700108

Only TIME
09:18:21

General datetime
1970-01-08 09:18:21Z

For Database
1970-01-08 09:18:21

For HTTP1.1
Thu, 08 Jan 1970 09:18:21 GMT

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