How to compare dates
Swift’s Date struct conforms to both Equatable and Comparable, which means you check two dates for equality and compare them to see which is earlier.
In practice, this means you can use <, >, and == to compare them just like you would do with strings and integers. Try this in a playground:
let now = Date()
let soon = Date().addingTimeInterval(5000)
now == soon
now != soon
now < soon
now > soonAvailable from iOS 8.0
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