"Fri, 16 Jan 1970 21:48:27"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700116
Only TIME
21:48:27
General datetime
1970-01-16 21:48:27Z
For Database
1970-01-16 21:48:27
For HTTP1.1
Fri, 16 Jan 1970 21:48:27 GMT