"Tue, 13 Jan 1970 11:20:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
11:20:02
General datetime
1970-01-13 11:20:02Z
For Database
1970-01-13 11:20:02
For HTTP1.1
Tue, 13 Jan 1970 11:20:02 GMT