Question 339439 in IOS Swift Question posted in
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Ios swift – Setting end date time (hour and minutes) after start date time

I have 2 date objects – start date and end date. I have a requirement where my end date’s time should be an hour after the time of start date i.e. let’s say start date is Feb 12, 3:00 pm and my end date is Feb 15th, but display time for my end date should be 4:00pm i.e. an hour after the start time.

Here is what I tried:

let startDateComponents = Calendar.current.dateComponents([.hour, .minute], from: startDateTime)
print("startDateComponents - (startDateComponents)")
                
endDateTime = Calendar.current.date(byAdding: .hour, value: 1, to: startDateTime) ?? endDateTime

This works fine when I have both the dates same i.e. Start date is Feb 12th and end date is also Feb 12th, then I get start date as Feb 12, 3:00pm and end date as Feb 12, 4:00pm. However if my end date is Feb 15 and I am expecting end date to Feb 15th, 4:00pm, running the above code gives me Feb 12th, 4:00pm.

How can I create a date object with just change in time?

Also if start date if Feb 12, 11:00pm, when I change the time on end date, it should turn into next date i.e. Feb 16th 00:00am and not Feb 15th 00:00.

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2

Answers


  1. 0

    The code you’ve submitted above appears to be working for me. Can you provide more details as to the context of your code?

    import Foundation

var startDateTime = Date.now
let startDateComponents = Calendar.current.dateComponents([.hour, .minute], from: startDateTime)
print("startDateComponents - (startDateComponents)")

var endDateTime = Calendar.current.date(byAdding: .hour, value: 8, to: startDateTime)

    when ran in a playground gave me the current date
    "12 Feb 2024 at 4:31 PM"
    and an endDateTime of
    "13 Feb 2024 at 12:31 AM".

    Also if start date if Feb 12, 11:00pm, when I change the time on end date, it should turn into next date i.e. Feb 16th 00:00am and not Feb 15th 00:00.

    I’m not 100% sure if that’s what you’re asking, but as far as a bidirectional relationship between start and end date, I would probably implement this with an object along these lines, but you’ll need to adjust based on your own use case.

    struct RelatedDateInterval {
    private var _startDateTime: Date
    var startDateTime: Date {
        get {
            return _startDateTime
        }
        
        set {
            _startDateTime = newValue
            if timeInterval != endDateTime.timeIntervalSince(newValue) {
                _endDateTime = newValue.addingTimeInterval(timeInterval)
            }
        }
    }
    private var _endDateTime: Date
    var endDateTime: Date {
        get {
            return _endDateTime
        }
        
        set {
            _endDateTime = newValue
            if timeInterval != newValue.timeIntervalSince(_startDateTime) {
                _startDateTime = newValue.addingTimeInterval(-timeInterval)
            }
        }
    }
    
    private let timeInterval: TimeInterval
    
    init(startDateTime: Date, endDateTime: Date) {
        self.timeInterval = endDateTime.timeIntervalSince(startDateTime)
        self._startDateTime = startDateTime
        self._endDateTime = endDateTime
    }
}

var relatedDateInterval = RelatedDateInterval(startDateTime: startDateTime, endDateTime: endDateTime)
print("Old dates - (relatedDateInterval.startDateTime) - (relatedDateInterval.endDateTime)")
relatedDateInterval.startDateTime = Date.distantFuture
print("New dates - (relatedDateInterval.startDateTime) - (relatedDateInterval.endDateTime)")

    returns "Old dates - 2024-02-12 23:42:23 +0000 - 2024-02-13 07:42:23 +0000n" and "New dates - 4001-01-01 00:00:00 +0000 - 4001-01-01 08:00:00 +0000n".

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  2. 0

    Try this approach using DateComponents from the startDate and the endDate
    to construct your newEndDate having the same hours, minutes, seconds
    as the startDate.

    Example code:

    var startDate = Date()
var endDate = Date().addingTimeInterval(60*60*24*3 + 125)
print("---> startDate: (startDate)   endDate: (endDate)")

let startComp = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute, .second], from: startDate)
var endComp = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute, .second], from: endDate)

endComp.hour = startComp.hour     // <--- here
endComp.minute = startComp.minute // <--- here
endComp.second = startComp.second // <--- here

let newEndDate = Calendar.current.date(from: endComp)
print("---> newEndDate: (newEndDate)")
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