How to get 30 minutes time slots array in between two dates swift

Question

for example:

startDate:- 20-08-2018 10:00 AM

endDate:- 20-08-2018 02:30 PM

Output: ["10:00 AM", "10:30 AM", "11:00 AM", "11:30 AM", "12:00PM", "12:30 PM", "01:00 PM", "01:30 PM", "02:00 PM", "02:30 PM"]

var fromTime:Date = getFromTime
fromTime = fromTime.addingTimeInterval(-1800)

guard let toTime:Date  = timeFormat.date(from:endTime) else {
    return nil
}

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

var timeArrayAM = [String]()
var timeArrayPM = [String]()

for _ in stride(from: 0, to: Int(numberOfIntervals * 2), by: 1) {

    dateByAddingThirtyMinute = fromTime.addingTimeInterval(1800)
    fromTime = dateByAddingThirtyMinute

    if let dateString = dateByAddingThirtyMinute.format(with: "hh:mm a") as? String {

        // print("Time after 30 min = \(dateString)")

        if temp == 0 {

            let time = dateString
            guard let getStopTime = timeFormat.date(from: time) else {

                return nil
            }

            var stopTime = getStopTime

            var date = Date()
            date = date.addingTimeInterval(TimeInterval(advanceTimeInterval*60))
            let calendar = Calendar.current

            let year = calendar.component(.year, from: date)
            let month = calendar.component(.month, from: date)
            let day = calendar.component(.day, from: date)
            let hour = calendar.component(.hour, from: stopTime)
            let minute = calendar.component(.minute, from: stopTime)

            stopTime = calendar.date(bySetting: .year, value: year, of: stopTime)!
            stopTime = calendar.date(bySetting: .month, value: month, of: stopTime)!
            stopTime = calendar.date(bySetting: .day, value: day, of: stopTime)!
            stopTime = calendar.date(bySetting: .hour, value: hour, of: stopTime)!
            stopTime = calendar.date(bySetting: .minute, value: minute, of: stopTime)!

            let timeDifference = calendar.dateComponents([.hour, .minute], from: stopTime, to: date)

            // print_debug("************************************")
            // print(timeDifference.hour, timeDifference.minute)
            if timeDifference.hour! < 0 || timeDifference.minute! < 0 || (timeDifference.hour! == 0 && timeDifference.minute! == 0 ) {
                showFirstTime = dateString
                temp = 1
            }
            // print_debug("************************************")
        }

Answer 1

You can do this,

var array: [String] = []

let formatter = DateFormatter()
formatter.dateFormat = "dd-MM-yyyy hh:mm a"

let formatter2 = DateFormatter()
formatter2.dateFormat = "hh:mm a"

let startDate = "20-08-2018 10:00 AM"
let endDate = "20-08-2018 02:30 PM"

let date1 = formatter.date(from: startDate)
let date2 = formatter.date(from: endDate)

var i = 1
while true {
    let date = date1?.addingTimeInterval(TimeInterval(i*30*60))
    let string = formatter2.string(from: date!)

    if date! >= date2! {
        break;
    }

    i += 1
    array.append(string)
}
print(array)

Output of above is,

["10:30 AM", "11:00 AM", "11:30 AM", "12:00 PM", "12:30 PM", "01:00 PM", "01:30 PM", "02:00 PM", "02:30 PM"]

Answer 2

Get 30 minute time slote between two dates.

override func viewDidLoad() {

 super.viewDidLoad() // Do any additional setup after loading the view. setTimeArray() } func setTimeArray(){ var array: [String] = [] let formatter = DateFormatter() formatter.dateFormat = "dd-MM-yyyy HH:mm" let formatter2 = DateFormatter() formatter2.dateFormat = "hh:mm a" let dateFormatter = DateFormatter() dateFormatter.dateFormat = "dd-MM-yyyy" let dt = Date() let nxtDt = dt.getNextDate() let Curdate = dt.DateToString(Formatter: "dd-MM-yyyy") let Nxtdate = nxtDt.DateToString(Formatter: "dd-MM-yyyy") let startDate = "\\(Curdate) 10:00" let endDate = "\\(Nxtdate) 00:00" let date1 = formatter.date(from: startDate) let date2 = formatter.date(from: endDate) let interval = 30 let string = formatter2.string(from: date1!) array.append(string) var i = 1 while true { let date = date1?.addingTimeInterval(TimeInterval(i*interval!*60)) let string = formatter2.string(from: date!) if date! >= date2! { break; } i += 1 array.append(string) } }

Output is:

["10:00 AM", "10:30 AM", "11:00 AM", "11:30 AM", "12:00 PM", "12:30 PM", "01:00 PM", "01:30 PM", "02:00 PM", "02:30 PM", "03:00 PM", "03:30 PM", "04:00 PM", "04:30 PM", "05:00 PM", "05:30 PM", "06:00 PM", "06:30 PM", "07:00 PM", "07:30 PM", "08:00 PM", "08:30 PM", "09:00 PM", "09:30 PM", "10:00 PM", "10:30 PM", "11:00 PM", "11:30 PM"]