"Sat, 31 Jan 1970 20:35:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
20:35:33
General datetime
1970-01-31 20:35:33Z
For Database
1970-01-31 20:35:33
For HTTP1.1
Sat, 31 Jan 1970 20:35:33 GMT