You can also make a reference to a future event - say, have someone slip something in like "we can't do X, we're going to see the courthouse in three weeks!" in the dialogue (preferably, close to the end of the chapter/wherever that time segment ends), and then show them at the court house as part of a tour group (a completely random scenario, but you know what I mean). If your reason to skip time is to move between important plot points, it should be possible when your characters know that something is going to happen ahead of time. Other times, as someone else suggested, you can use montages or the change in a trivial object. You don't always have to use the same technique if it's something that makes intrinsic sense.