"Sun, 11 Jan 1970 20:39:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
20:39:39
General datetime
1970-01-11 20:39:39Z
For Database
1970-01-11 20:39:39
For HTTP1.1
Sun, 11 Jan 1970 20:39:39 GMT