"Thu, 01 Jan 1970 18:15:30"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
18:15:30
General datetime
1970-01-01 18:15:30Z
For Database
1970-01-01 18:15:30
For HTTP1.1
Thu, 01 Jan 1970 18:15:30 GMT