"Sun, 01 Feb 1970 00:54:18"

Convert date and time to unixtime.

2681658

Another datetime format string at UTC

YYYYMMDD
19700201

Only TIME
00:54:18

General datetime
1970-02-01 00:54:18Z

For Database
1970-02-01 00:54:18

For HTTP1.1
Sun, 01 Feb 1970 00:54:18 GMT

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