"Sun, 11 Jan 1970 21:48:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
21:48:16
General datetime
1970-01-11 21:48:16Z
For Database
1970-01-11 21:48:16
For HTTP1.1
Sun, 11 Jan 1970 21:48:16 GMT