"Sun, 01 Feb 1970 12:54:21"

Convert date and time to unixtime.

2724861

Another datetime format string at UTC

YYYYMMDD
19700201

Only TIME
12:54:21

General datetime
1970-02-01 12:54:21Z

For Database
1970-02-01 12:54:21

For HTTP1.1
Sun, 01 Feb 1970 12:54:21 GMT

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