Comparing NSDate

NSDate+Comparable.swift

import Foundation

// MARK: - Extension
extension NSDate: Comparable {}

public func <(lhs: NSDate, rhs: NSDate) -> Bool {
	return lhs.timeIntervalSinceReferenceDate < rhs.timeIntervalSinceReferenceDate
}

public func <=(lhs: NSDate, rhs: NSDate) -> Bool {
	return lhs.timeIntervalSinceReferenceDate <= rhs.timeIntervalSinceReferenceDate
}

public func >=(lhs: NSDate, rhs: NSDate) -> Bool {
	return lhs.timeIntervalSinceReferenceDate >= rhs.timeIntervalSinceReferenceDate
}

public func >(lhs: NSDate, rhs: NSDate) -> Bool {
	return lhs.timeIntervalSinceReferenceDate > rhs.timeIntervalSinceReferenceDate
}


// MARK: - Examples
let now = NSDate()
let anHourAgo = now.dateByAddingTimeInterval(-60*60)

assert(now > anHourAgo)
assert(!(now < anHourAgo))
assert(!(now > now))
assert(!(now < now))
assert(now >= now)
assert(now <= now)
assert(now >= anHourAgo)
assert(!(now <= anHourAgo))