"Sun, 11 Jan 1970 11:39:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
11:39:02
General datetime
1970-01-11 11:39:02Z
For Database
1970-01-11 11:39:02
For HTTP1.1
Sun, 11 Jan 1970 11:39:02 GMT