"Sun, 11 Jan 1970 14:09:52"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
14:09:52
General datetime
1970-01-11 14:09:52Z
For Database
1970-01-11 14:09:52
For HTTP1.1
Sun, 11 Jan 1970 14:09:52 GMT