"Fri, 27 Feb 1970 18:16:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700227
Only TIME
18:16:02
General datetime
1970-02-27 18:16:02Z
For Database
1970-02-27 18:16:02
For HTTP1.1
Fri, 27 Feb 1970 18:16:02 GMT