"Thu, 01 Jan 1970 23:33:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
23:33:48
General datetime
1970-01-01 23:33:48Z
For Database
1970-01-01 23:33:48
For HTTP1.1
Thu, 01 Jan 1970 23:33:48 GMT