"Fri, 09 Jan 1970 20:42:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700109
Only TIME
20:42:40
General datetime
1970-01-09 20:42:40Z
For Database
1970-01-09 20:42:40
For HTTP1.1
Fri, 09 Jan 1970 20:42:40 GMT