NSDate beginning of day and end of day

Question

    -(NSDate *)beginningOfDay:(NSDate *)date
{
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *components = [cal components:( NSMonthCalend         


        

Answer 1

Swift 3

  class func today() -> NSDate {
        return NSDate()
    }

    class func dayStart() -> NSDate {
          return NSCalendar.current.startOfDay(for: NSDate() as Date) as NSDate
    }

    class func dayEnd() -> NSDate {
        let components = NSDateComponents()
        components.day = 1
        components.second = -1
        return NSCalendar.current.date(byAdding: components as DateComponents, to: self.dayStart() as Date)
    }

Answer 2

Just for reference, simple way to set Start and End of the day in Swift 4,

var comp: DateComponents = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute, .second], from: Date())
comp.hour = 0
comp.minute = 0
comp.second = 0
comp.timeZone = TimeZone(abbreviation: "UTC")!


//Set Start of Day
let startDate : Date = Calendar.current.date(from: comp)!
print(“Day of Start : \(startDate)")


//Set End of Day
comp.hour = 23
comp.minute = 59
comp.second = 59

let endDate : Date = Calendar.current.date(from:comp)!
print("Day of End : \(endDate)")

Answer 3

You are missing NSDayCalendarUnit in the components.

Answer 4

In iOS 8+ this is really convenient; you can do:

let startOfDay = NSCalendar.currentCalendar().startOfDayForDate(date)

To get the end of day then just use the NSCalendar methods for 23 hours, 59 mins, 59 seconds, depending on how you define end of day.

// Swift 2.0
let components = NSDateComponents()
components.hour = 23
components.minute = 59
components.second = 59
let endOfDay = NSCalendar.currentCalendar().dateByAddingComponents(components, toDate: startOfDay, options: NSCalendarOptions(rawValue: 0))

Date Math

Apple iOS NSCalendar Documentation. (See Section: Calendrical Calculations)

NSCalendar methods discussed by NSHipster.

Answer 5

Just another way using dateInterval(of:start:interval:for:) of Calendar and the dedicated DateInterval struct

On return startDate contains the start of the day and interval the number of seconds in the day.

func dateInterval(of date : Date) -> DateInterval {
    var startDate = Date()
    var interval : TimeInterval = 0.0
    Calendar.current.dateInterval(of: .day, start: &startDate, interval: &interval, for: date)
    return DateInterval(start: startDate, duration: interval-1)
}

let interval = dateInterval(of: Date())
print(interval.start, interval.end)

Answer 6

You don't have to set up the components to zero, just ignore them:

-(NSDate *)beginningOfDay:(NSDate *)date
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *components = [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:date];
    return [calendar dateFromComponents:components];
}