First you should click on this link ...
Note the information / instructions on this page.
This is a calendar question in the Sawtooth Software Question Library. This library consists of some very neat and advanced question types. Take your time browsing through them at your earliest convenience. There are some very cool features in here.
Zachary Anderson from Sawtooth Software is your best contact if you have any specific questions about this library. He is a very helpful and accommodating fellow too.
You need to download the calendar question by clicking on the green button. Once downloaded, you need to import the calendar question into Sawtooth Software.
I suggest you go into Sawtooth Software and click on the Library button and then hit F1 for HELP. Some useful instructions will appear on how to import the calendar question into your own library.
Once imported, you can use the calendar question like all other question types (Select, Grid, Numeric, Text, etc.).
Let me know how you go.