"Fri, 16 Jan 1970 21:45:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700116
Only TIME
21:45:44
General datetime
1970-01-16 21:45:44Z
For Database
1970-01-16 21:45:44
For HTTP1.1
Fri, 16 Jan 1970 21:45:44 GMT