"Thu, 15 Jan 1970 19:40:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
19:40:31
General datetime
1970-01-15 19:40:31Z
For Database
1970-01-15 19:40:31
For HTTP1.1
Thu, 15 Jan 1970 19:40:31 GMT