"Fri, 16 Jan 1970 20:37:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700116
Only TIME
20:37:48
General datetime
1970-01-16 20:37:48Z
For Database
1970-01-16 20:37:48
For HTTP1.1
Fri, 16 Jan 1970 20:37:48 GMT