CODEWITHSUNDEEP
iosswiftnsdate
123
123

Reputation: 8951

Getting yesterday's NSDate start and end

I have looked through a few similar questions on here, but they address slightly different issues than what I'm trying to do. I want to create an NSDate object for the beginning and end of yesterday (12:00am - 12:00am). I have successfully created an NSDate for the start of the day and the end of the day, but I can only do it for the current day, not the previous day. This doesn't seem like it should be much more difficult, but I've run into some trouble with it.

My start and end NSDate for the current day:

extension NSDate {

    var startOfDay: NSDate {
        return NSCalendar.currentCalendar().startOfDayForDate(self)
    }

    var endOfDay: NSDate? {
        let components = NSDateComponents()
        components.day = 1
        components.second = -1
        return NSCalendar.currentCalendar().dateByAddingComponents(components, toDate: startOfDay, options: NSCalendarOptions())
    }
}

I've tried adding something like this:

var yesterday = NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitDay, value: -1, toDate: NSDate(), options: nil)

But I get an error

Type of expression is ambiguous without more context

. I'm clearly missing something important here, but I can't seem to figure out what it is.

Upvotes: 0

Views: 810

Answers (1)

Travis Griggs
Travis Griggs

Reputation: 22252

Some extensions I drag around. Plop the following in a play and enjoy:

import UIKit

extension NSDate {
    var yesterday:NSDate {
        let calendar = NSCalendar.currentCalendar()
        return calendar.startOfDayForDate(calendar.dateByAddingUnit(.Day, value: -1, toDate: self, options: NSCalendarOptions.WrapComponents)!)
    }

    var tomorrow:NSDate {
        let calendar = NSCalendar.currentCalendar()
        return calendar.startOfDayForDate(calendar.dateByAddingUnit(.Day, value: 1, toDate: self, options: NSCalendarOptions.WrapComponents)!)
    }
}


let now = NSDate()
now.yesterday
now.tomorrow
now.yesterday.yesterday.yesterday.yesterday
now.tomorrow.yesterday

Upvotes: 1

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