"Fri, 16 Jan 1970 14:46:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700116
Only TIME
14:46:20
General datetime
1970-01-16 14:46:20Z
For Database
1970-01-16 14:46:20
For HTTP1.1
Fri, 16 Jan 1970 14:46:20 GMT