"Fri, 09 Jan 1970 19:39:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700109
Only TIME
19:39:42
General datetime
1970-01-09 19:39:42Z
For Database
1970-01-09 19:39:42
For HTTP1.1
Fri, 09 Jan 1970 19:39:42 GMT