CODEWITHSUNDEEP
iosswift
Alessandro
Alessandro

Reputation: 4100

Comparing two NSDates day, month and year integers

I am trying to compare two NSDates to understand if they are in the same day or not. These are the two dates (the second one is always the current date, NSDate()):

2015-08-23 22:00:00 +0000 2015-08-23 19:13:45 +0000

It seems obvious that the dates are in the same day, as 23 = 23. However I can't seem to be able to establish this in the code. I tried:

1) 

let date = tripObject["tripDate"] as! NSDate
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let str = dateFormatter.stringFromDate(date)

let date2 = NSDate()
let dateFormatter2 = NSDateFormatter()
dateFormatter2.dateFormat = "yyyy-MM-dd"
let str2 = dateFormatter2.stringFromDate(date2)

println(". \(str) and \(str2) .")

This gives 2015-08-24 and 2015-08-23

2) 

let dateComponents = NSCalendar.currentCalendar().components(.CalendarUnitYear | .CalendarUnitMonth | .CalendarUnitDay, fromDate: tripObject["tripDate"] as! NSDate)
let dateComponents2 = NSCalendar.currentCalendar().components(.CalendarUnitYear | .CalendarUnitMonth | .CalendarUnitDay, fromDate: NSDate())

This gives different day components.

3)

if NSCalendar.currentCalendar().isDate(firstDate!, inSameDayAsDate: secondDate!){

4)

if NSCalendar.currentCalendar().isDateInToday(the NSDate) {

Both 3 and 4 fail.

I am totally lost, any ideas?

Upvotes: 4

Views: 6135

Answers (3)

vadian
vadian

Reputation: 285082

NSCalendar has a method isDate:equalToDate:toUnitGranularity: which does exactly what you need

date1 and date2 are the NSDate instances to be compared, the result is Bool

let calendar = NSCalendar.currentCalendar()
calendar.timeZone = NSTimeZone(forSecondsFromGMT: 0)
let datesAreInTheSameDay = calendar.isDate(date1, equalToDate: date2, toUnitGranularity: .CalendarUnitDay | .CalendarUnitMonth | .CalendarUnitYear)

Swift 2:

let datesAreInTheSameDay = calendar.isDate(date1, equalToDate: date2, toUnitGranularity: [.Day, .Month, .Year])

Swift 3:

var calendar = Calendar.current
calendar.timeZone = TimeZone(secondsFromGMT: 0)!
let datesAreInTheSameDay = calendar.isDate(date1, equalTo: date2, toGranularity:.day)

Upvotes: 14

SteffenK
SteffenK

Reputation: 712

You can use this extension:

extension NSDate {

    func isEqualToDate2(dateToCompare : NSDate) -> Bool {
        //Declare Variables
        var isEqualTo = false

        //Compare Values
        if self.compare(dateToCompare) == NSComparisonResult.OrderedSame {
            isEqualTo = true
        }

        //Return Result
        return isEqualTo
    }

}

like:

if date1.isEqualToDate2(date2) {
...
}

Upvotes: 0

Adnan Aftab
Adnan Aftab

Reputation: 14477

You can convert both dates to start of the day and then use compare method of NSDate to compare them

   let date1StartOfTheDay = NSCalendar.currentCalendar().startOfDayForDate(date)
   let date2StartOfTheDay = NSCalendar.currentCalendar().startOfDayForDate(date2
   if date1StartOfTheDay.compare(date2StartOfTheDay) == OrderedSame
   {
       //same dates
    }

Upvotes: 3

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