There are now nearly 9 million apps worldwide, and practically all of them run on an internal clock. Financial apps are built on timestamped data. Office apps run on calendars. Social apps are defined by their feeds, timelines and anniversaries. So, as devs, we need to know how to compute date and time. JavaScript, the world’s most popular programming language, has plenty of helpful APIs, but they can throw up complications if you’ve never used them before.

Developers striving to learn iOS face a rate of change that’s unprecedented in mobile history. iOS 17 is about to go live, just weeks after Apple released the latest versions of iOS 15 and 16. The latest upgrade will cut off all versions up to the iPhone X (which itself is only six years old) and comes with: If you really want to learn and master iOS app development, you need a blend of learning resources that cover all these topics, as well as all the basics of iOS.