"Tue, 06 Jan 1970 20:46:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
20:46:40
General datetime
1970-01-06 20:46:40Z
For Database
1970-01-06 20:46:40
For HTTP1.1
Tue, 06 Jan 1970 20:46:40 GMT