Unable to Purchase error in iPhone App Store

Just got an “Unable to Purchase” error while updating a bunch of different apps on my iPhone using the App Store.

It didn’t affect the actual upgrade, but the error appeared twice before I entered my iTunes password – after a quick search it seems the problem is related to changed system times. I hadn’t attempted an update since before daylight savings started here three days ago, so I’m assuming that is the reason.

For me, this didn’t actually prevent anything from working – but leave a comment if you’ve had more specific problems. If time related, it’s a curious limitation on the app store indeed (app rental?). More likely it’s just some boring transactional code playing up, but who knows…