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