"Wed, 21 Jan 1970 20:36:18"

Convert date and time to unixtime.

1802178

Another datetime format string at UTC

YYYYMMDD
19700121

Only TIME
20:36:18

General datetime
1970-01-21 20:36:18Z

For Database
1970-01-21 20:36:18

For HTTP1.1
Wed, 21 Jan 1970 20:36:18 GMT

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