Detect dates, holidays and so forth

I believe games like Angry Birds change their graphics in an update, so they wouldn't have all the graphics in the app at once. That's one way to go. Different versions for different seasons.

You can always use the date-time object to check for a certain period and use different graphics accordingly. But I think this will make the app heavier and an extra hassle to code. I'd op for the Angry Birds method.

The Date-time object is the way to go as it's cross platform, just get the month and day and compare to the dates your after. Yet it will only be useful for set dates (or perhaps a date range eg. a Christmas skin for December). If you want to a set a specific date for a movable holiday, for example Easter, the date-time object won't help much. (By the way Easter occurs at the earliest, March 22 and the latest April 25, if you wanted to set a date range for a skin to be available). A cool feature you could integrate would be to offer unlockable skins that users could choose when ever they wanted

Just adding some ideas for movable holidays -

depending on how long you want your application to "live"
you could store a table where to lookup holidays for each year:

i.e. for next 5 years easter:
Please login to see this link.

Probably longer-lasting tables can be found online, with many additional holydays (depending on countries too).

I think Google has a free API for a calendar where you could retrieve all needed infos in JSON or SOAP protocols
but I've only used those services from webservers
I guess would require some extra tweaking talking them from Fusion X)

Otherwise, if easter is the only movable holiday you need, you could check above link to see how it gets calculated
and replicate this taking avail of Date/Time object.

Date-time is pretty straightforward,
just tweaking with it will probably get you on the right track!

month of ("Date and Time") = 12
day of month of ("Date and Time") = 25
>>> it's Christmas!

Well, that was pseudocode typed out of memory XD

Try this:
Please login to see this attachment.

change your computer clock to 25 December to see the string change in realtime
(left-click the clock on your taskbar, change date and time settings, change date and time)

You can implement all date and time functions just by rightclicking the object in the expression editor

Sorry I'm in Australia, I must have been asleep and I missed your request. Glad to see you got it sorted

Schrodinger, Great call on the table. This is a solution that seems easy to implement and update, or do the homework and be good for 25 years