"Tue, 06 Jan 1970 20:40:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
20:40:15
General datetime
1970-01-06 20:40:15Z
For Database
1970-01-06 20:40:15
For HTTP1.1
Tue, 06 Jan 1970 20:40:15 GMT