For consistency, SignUp should be updated with the new date picker introduced in
We have had several complaints from our users saying that signup should use 24hours format instead of PM/AM. The input for the hours is a bit confusing since it allows the user to enter numbers bigger than '12'. Please see screenshot attached.
Maybe, since signup is now a core tool, the best solution would be to update the date picker like it was done in a wide range of other Sakai tools.