"Sun, 11 Jan 1970 19:40:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
19:40:36
General datetime
1970-01-11 19:40:36Z
For Database
1970-01-11 19:40:36
For HTTP1.1
Sun, 11 Jan 1970 19:40:36 GMT