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iosswiftnsdate

How to check if two NSDates are from the same day

I am working on ios development and I find it really hard to check if two NSDates are from the same day. I tried to use this

   fetchDateList()
    // Check date
    let date = NSDate()
    // setup date formatter
    let dateFormatter = NSDateFormatter()
    // set current time zone
    dateFormatter.locale = NSLocale.currentLocale()

    let latestDate = dataList[dataList.count-1].valueForKey("representDate") as! NSDate
    //let newDate = dateFormatter.stringFromDate(date)
    let diffDateComponent = NSCalendar.currentCalendar().components([NSCalendarUnit.Year, NSCalendarUnit.Month, NSCalendarUnit.Day], fromDate: latestDate, toDate: date, options: NSCalendarOptions.init(rawValue: 0))
    print(diffDateComponent.day)

but it just checks if two NSDates has a difference of 24 hours. I think there is a way to make it work but still, I wish to have NSDate values before 2 am in the morning to be count as the day before, so I definitely need some help here. Thanks!

Solution

  • NSCalendar has a method that does exactly what you want actually! 

    /*
    This API compares the Days of the given dates, reporting them equal if they are in the same Day.
*/
- (BOOL)isDate:(NSDate *)date1 inSameDayAsDate:(NSDate *)date2 NS_AVAILABLE(10_9, 8_0);

    So you'd use it like this:

    [[NSCalendar currentCalendar] isDate:date1 inSameDayAsDate:date2];

    Or in Swift

    Calendar.current.isDate(date1, inSameDayAs:date2)