"Thu, 01 Jan 1970 18:15:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
18:15:13
General datetime
1970-01-01 18:15:13Z
For Database
1970-01-01 18:15:13
For HTTP1.1
Thu, 01 Jan 1970 18:15:13 GMT