"Sun, 11 Jan 1970 21:12:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
21:12:36
General datetime
1970-01-11 21:12:36Z
For Database
1970-01-11 21:12:36
For HTTP1.1
Sun, 11 Jan 1970 21:12:36 GMT