"Tue, 13 Jan 1970 12:31:38"
Convert date and time to unixtime.
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