The developer, attorney Dan Friedlander, tells me that he is looking into adding this feature to Court Days, but in the meantime he has come out with a related app called Workdays that may appeal to many attorneys. Just as was the case with Court Days, Workdays lets you calculate three dates based on an initial date, either including or excluding weekends. They can either all count from the same initial date, or you can turn on "sequential dates" and they will count one after each other. (For example, a the first calculation might be 30 days from the starting date not counting weekends, then the next calculation might be 5 days after that including weekends, etc.)
After Workdays calculates dates for you, you can click the e-mail button at the top left to e-mail the full results to yourself or someone else. (This is a feature that Dan also plans to add to Court Days.)
Workdays has an option to not count federal holidays, and you can tap the information button to see what those holidays are. But what makes Workdays unique is the ability to create your own list of custom holidays. Just select a date and then add it to your list of custom holidays. So with this app, you could manually add each date that you know that a court is closed for the upcoming year, and then the app will always count correctly, excluding when appropriate those holidays.
Workdays requires a little more up-front work on your part to enter all of the holidays in your jurisdiction, but if you want to have complete control over the days that are counted in a date calculator, you'll really like the way that Workdays works. And like all of Dan's other apps, at 99¢ this app is cheap enough that even if you only use it occasionally, you won't feel guilty about the purchase.
Click here to get Workdays ($0.99): 
