If you're working with an XCode application, either iOS or MacOS, and want to do a completely clean build and delete the cache, it's simple. Execute this command from the command line.. defaults delete your.apps.bundle.id Where "your.apps.bundl...

There are a few ways to solve this problem. However, I think the easiest is to cache the day of the year that the user is born on as an integer. If stored alongside the timestamp we can quickly get a list but properly handle the full birthday elsewhere, s...