"Tue, 13 Jan 1970 18:15:38"

Convert date and time to unixtime.

1102538

Another datetime format string at UTC

YYYYMMDD
19700113

Only TIME
18:15:38

General datetime
1970-01-13 18:15:38Z

For Database
1970-01-13 18:15:38

For HTTP1.1
Tue, 13 Jan 1970 18:15:38 GMT


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