How to check whether one date is similar to another
Swift version: 5.2
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()
let second = Date().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)
SPONSORED Announcing NSSpain 2020: Remote Edition! An online, continuous conference for iOS developers. We’ll start on Thursday and finish on Friday, with talks, activities, and lots of fun for 36 hours, non-stop. Sound good? Join us!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 8.0
Similar solutions…
- How to create live playgrounds in Xcode
- How to count objects in a set using NSCountedSet
- Building a menu using List
- SwiftUI tips and tricks
- How to use Instruments to profile your SwiftUI code and identify slow layouts
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
