validate date/time entries

Basically, i want the participants to be allowed only to enter dates between december 10, 2012 and december 24, 2012. Unfortunately there are no minimum/maximum fields for the date question.

How can I use Expression Manager to check if a entered date is smaller or larger than a given date? Are there any examples I could have a look at?

Any help appreciated!

boosting this one up.
Can someone help us on this one?
Thx

This has been implemented in version 2.05.
You'll find min max fields in the advanced question attributes of the date question. Have a look in the manual for details.
Regards,
M

Had to make myself more clear, sorry.
I would like to calculate the minimum and maximum dates.

If someone gives his date of birth and I want to know how long someone has lived in a city, I don't want them to be able to pass a date before their dob or after today.

Try the following: in the datemin field put your questioncode of the question that asks for the date of birth. Eg. Dob
In the maxdate field put:date("Y-m-d H:i",strtotime("now"))

It should do the trick.
Please also have a look at: manual.limesurvey.org/Question_type_-_Date for more what you can do with dates and EM in ls 2.05