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How to check whether one date is similar to another

Swift version: 5.1

Paul Hudson    @twostraws   

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)

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Available from iOS 8.0

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