"Tue, 27 Jan 1970 00:40:20"

Convert date and time to unixtime.

2248820

Another datetime format string at UTC

YYYYMMDD
19700127

Only TIME
00:40:20

General datetime
1970-01-27 00:40:20Z

For Database
1970-01-27 00:40:20

For HTTP1.1
Tue, 27 Jan 1970 00:40:20 GMT

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