Time Groups: "4th Thursday"?

Is there a way to modify the time groups module to allow entry of things like “4th Thursday” instead of using a specific date? Since there are so many events and so many holidays which are based on this criteria, I think it would be an extremely useful enhancement. Thanks!

As we use the built in function in Asterisk, you can try this:

Make a new Time Condition, call it Thanksgiving
Set Week Day start: to Thursday
Set Month Day start: to 22
Set Month Day finish: to 28
Set Month start: to November

Now, when it is Thursday in November between 22nd and 28th, it will be true

You can read more here about the function we use and the settings that can be applied:
http://www.voip-info.org/wiki/view/Asterisk+cmd+GotoIfTime