"Tue, 13 Jan 1970 12:31:38"

Convert date and time to unixtime.

1081898

Another datetime format string at UTC

YYYYMMDD
19700113

Only TIME
12:31:38

General datetime
1970-01-13 12:31:38Z

For Database
1970-01-13 12:31:38

For HTTP1.1
Tue, 13 Jan 1970 12:31:38 GMT


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