"Tue, 13 Jan 1970 14:44:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
14:44:44
General datetime
1970-01-13 14:44:44Z
For Database
1970-01-13 14:44:44
For HTTP1.1
Tue, 13 Jan 1970 14:44:44 GMT