"Sun, 11 Jan 1970 18:27:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
18:27:23
General datetime
1970-01-11 18:27:23Z
For Database
1970-01-11 18:27:23
For HTTP1.1
Sun, 11 Jan 1970 18:27:23 GMT