"Sun, 11 Jan 1970 20:36:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
20:36:18
General datetime
1970-01-11 20:36:18Z
For Database
1970-01-11 20:36:18
For HTTP1.1
Sun, 11 Jan 1970 20:36:18 GMT