As of January 2016, the entry and exit requirements for all countries within the Schengen area have changed. Previously, your passport only needed to be valid for 3 months beyond your exit date from the Schengen area (or in most cases, the date of your return flight). Now, it is 6 months. If you're planning to travel to Europe soon, it's important that you (1) check your passport's expiration date and (2) get it renewed if it expires less than 6 months beyond the date you are EXITING the Schengen area (not entering it).
