We use something like this in our alert rules for a specific set of interfaces.  We are using CurrentDateTime, but we found that those are treated like a String value and not a date/time value.  Hope this helps you out! Let me know if you have more questions.

Make sure you go thru ALL of the documentation and are comfortable with it.  Also, make sure you are mentally prepared with no distractions in your environment.  You really need to be able to focus 100% on the exam.  Good luck!