This is a sample project which illustrates the concept of using a Date Provider object based a presentation I gave in April 2017 at the Tokyo iOS Meetup. This project illustrates how a Date Provider object can be injected as a dependency for testing logic that depends on the current date & time.
Presentation slides can be found on SlideShare: https://www.slideshare.net/DerekLee/standing-the-test-of-time-the-date-provider-pattern