"Sun, 11 Jan 1970 09:20:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
09:20:15
General datetime
1970-01-11 09:20:15Z
For Database
1970-01-11 09:20:15
For HTTP1.1
Sun, 11 Jan 1970 09:20:15 GMT