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Matthew, >> We're looking at developing a screen in a gallery which would show today's date in 8-12 different calendars e.g. Gregorian, Julian, Chinese, Ethiopic etc. T >> There are essentially two different approaches to this problem. The first, which you seem to be considering, is to look for a programming environment (like .NET) which has a built in set of functions for dealing with all the calendars. The advantages of this approach is that some of the programming may be very straightforward and you don't need to know the algorithms for each calendar. The disadvantages are that you might not find an environment which supports all the algorithms you need and that environment may not be that great for producing an animated screen on gallery. For example it would be possible using something like Visual Basic .NET but things like graphics and installation would be much trickier than with a language like Flash. The second approach is to source algorithms for converting from the Gregorian calendar to the others you need. This has the advantage that you can use any programming environment you like but you would need to find all the algorithms. Most of these a pretty simple, I found one for the Ethiopic calendar with ten minutes of googling (http://ethiopic.org/Calendars/). This, in essence, is the approach that J Martin suggested. The third approach, which I would avoid, is to try and find other programs that support these calendars and try and bolt them together. This almost never works for museum exhibits as 95% of the program is concerned with the graphics and the display. A good analogy is to ask someone to make you a new car out of two old ones - it'll be more work than making one from scratch and the result won't be so good. All the best with your project and Happy Orthodox Easter (which uses the Julian Calendar and is this weekend...) Joe ************************************************** For mcg information and to manage your subscription to the list, visit the website at http://www.museumscomputergroup.org.uk **************************************************