"Thu, 08 Jan 1970 18:15:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700108
Only TIME
18:15:23
General datetime
1970-01-08 18:15:23Z
For Database
1970-01-08 18:15:23
For HTTP1.1
Thu, 08 Jan 1970 18:15:23 GMT