How to check whether one date is similar to another
Swift version: 5.6
Apple’s Calendar object gives us lots of useful methods for evaluating dates in various ways. One of the most useful is the method isDate(_:equalTo:toGranularity:), which lets us compare two dates at a specific level of granularity: do these two dates occur in the same minute? The same hour? Or day, week, year?
As an example, here are two dates for us to work with:
let first = Date.now
let second = Date.now.addingTimeInterval(10000)We can now check whether those two occur within the same day, like this:
let sameDay = Calendar.current.isDate(first, equalTo: second, toGranularity: .day)If all you want to do is check whether a date points to some time during today, you should use isDateInToday() instead:
let isToday = Calendar.current.isDateInToday(first)
SAVE 50% To celebrate WWDC23, all our books and bundles are half price, so you can take your Swift knowledge further without spending big! Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testing skills, and more.
Available from iOS 8.0
Similar solutions…
- How to check whether a date is inside a date range
- How to create a date picker and read values from it
- How to find similar words for a search term
- Check whether all items in an array match a condition
- How to check whether an integer lies inside a range
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
