How to make 30 minute time intervals in swift 2.3

Question

startTime = 10:00 AM endTime = 01:00 PM

Now i want to split the time in the interval of 30mins like

10:00 AM 10:30 AM 11:00 AM 11:30 AM .......... till 01:00 PM.

I tried like

   let startDate : NSDate! = NSDate()
    let time1 : NSDate = startDate.dateByAddingTimeInterval((60*60)/2)
    let time2 : NSDate = time1.dateByAddingTimeInterval((60*60)/2)
    let time3 : NSDate = time2.dateByAddingTimeInterval((60*60)/2)
    let time4 : NSDate = time3.dateByAddingTimeInterval((60*60)/2)

  func makeTimeInterval(startTime:String ,endTime:String) -> String
        {

            let timeFormat = DateFormatter()
            timeFormat.dateFormat = "hh:mm a"
            var fromTime:NSDate  = (timeFormat.date(from:startTime) as NSDate?)!
            let toTime:NSDate  = (timeFormat.date(from:endTime) as NSDate?)!

            var dateByAddingThirtyMinute : NSDate!
            let timeinterval : TimeInterval = toTime.timeIntervalSince(fromTime as Date)
            let numberOfIntervals : Double = timeinterval / 3600;
            var formattedDateString : String!


            for _ in stride(from: 0, to: Int(numberOfIntervals * 2), by: 1)
            {
                dateByAddingThirtyMinute = fromTime.addingTimeInterval(1800)
                fromTime = dateByAddingThirtyMinute
                let dateFormatter = DateFormatter()
                dateFormatter.dateFormat = "hh:mm a"
                formattedDateString = dateFormatter.string(from: dateByAddingThirtyMinute! as Date) as String?
                print("Time after 30 min = \(formattedDateString)")

            }

            return formattedDateString

        }

Tried those things and i got like 10:10,10:40..etc how to make 30 min round of interval like 10:00,10:30...etc

Thanks in advance

Answer 1

Use the below function if user enters anytime less than 30 than it will start with very next 30 min e.g 10:20, start from 10:30. And if user give time greater than 30 then very time will be 00 e.g 10:45, start from 11:00.

func makeTimeInterval(startTime:String ,endTime:String) -> String
{
    var arr = startTime.components(separatedBy: " ")[0].components(separatedBy: ":")
    let str = arr[1] as String
    if (Int(str)! > 0 && Int(str)! < 30){
        arr[1] = "00"
    }
    else if(Int(str)! > 30){
        arr[1] = "30"
    }
    let startT:String = "\(arr.joined(separator: ":"))  \(startTime.components(separatedBy: " ")[1])"

    let timeFormat = DateFormatter()
    timeFormat.dateFormat = "hh:mm a"
    var fromTime:NSDate  = (timeFormat.date(from:startT) as NSDate?)!
    let toTime:NSDate  = (timeFormat.date(from:endTime) as NSDate?)!

    var dateByAddingThirtyMinute : NSDate!
    let timeinterval : TimeInterval = toTime.timeIntervalSince(fromTime as Date)
    let numberOfIntervals : Double = timeinterval / 3600;
    var formattedDateString : String!


    for _ in stride(from: 0, to: Int(numberOfIntervals * 2), by: 1)
    {
        dateByAddingThirtyMinute = fromTime.addingTimeInterval(1800)
        fromTime = dateByAddingThirtyMinute
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "hh:mm a"
        formattedDateString = dateFormatter.string(from: dateByAddingThirtyMinute! as Date) as String?
        print("Time after 30 min = \(formattedDateString)")

    }

    return formattedDateString

}