"Tue, 20 Jan 1970 12:34:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
12:34:33
General datetime
1970-01-20 12:34:33Z
For Database
1970-01-20 12:34:33
For HTTP1.1
Tue, 20 Jan 1970 12:34:33 GMT