"Tue, 13 Jan 1970 09:21:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
09:21:03
General datetime
1970-01-13 09:21:03Z
For Database
1970-01-13 09:21:03
For HTTP1.1
Tue, 13 Jan 1970 09:21:03 GMT