"Tue, 13 Jan 1970 15:08:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
15:08:02
General datetime
1970-01-13 15:08:02Z
For Database
1970-01-13 15:08:02
For HTTP1.1
Tue, 13 Jan 1970 15:08:02 GMT