Getting Started Programming with Qt Quick

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 import QtQuick 2.11
 import QtQuick.Controls 2.4
 import QtQuick.Layouts 1.11
 import QtQuick.Window 2.11

 Dialog {
     id: alarmDialog
     title: "Add new alarm"
     modal: true
     standardButtons: DialogButtonBox.Ok | DialogButtonBox.Cancel

     property AlarmModel alarmModel

     function formatNumber(number) {
         return number < 10 && number >= 0 ? "0" + number : number.toString()
     }

     onAccepted: {
         alarmModel.append({
             "hour": hoursTumbler.currentIndex,
             "minute": minutesTumbler.currentIndex,
             "day": dayTumbler.currentIndex + 1,
             "month": monthTumbler.currentIndex + 1,
             "year": yearTumbler.years[yearTumbler.currentIndex],
             "activated": true,
             "label": "",
             "repeat": false,
             "daysToRepeat": [
                 { "dayOfWeek": 0, "repeat": false },
                 { "dayOfWeek": 1, "repeat": false },
                 { "dayOfWeek": 2, "repeat": false },
                 { "dayOfWeek": 3, "repeat": false },
                 { "dayOfWeek": 4, "repeat": false },
                 { "dayOfWeek": 5, "repeat": false },
                 { "dayOfWeek": 6, "repeat": false }
             ],
         })
     }
     onRejected: alarmDialog.close()

     contentItem: RowLayout {
         RowLayout {
             id: rowTumbler

             Tumbler {
                 id: hoursTumbler
                 model: 24
                 delegate: TumblerDelegate {
                     text: formatNumber(modelData)
                 }
             }
             Tumbler {
                 id: minutesTumbler
                 model: 60
                 delegate: TumblerDelegate {
                     text: formatNumber(modelData)
                 }
             }
         }

         RowLayout {
             id: datePicker

             Layout.leftMargin: 20

             property alias dayTumbler: dayTumbler
             property alias monthTumbler: monthTumbler
             property alias yearTumbler: yearTumbler

             readonly property var days: [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

             Tumbler {
                 id: dayTumbler

                 function updateModel() {
                     // Populate the model with days of the month. For example: [0, ..., 30]
                     var previousIndex = dayTumbler.currentIndex
                     var array = []
                     var newDays = datePicker.days[monthTumbler.currentIndex]
                     for (var i = 1; i <= newDays; ++i)
                         array.push(i)
                     dayTumbler.model = array
                     dayTumbler.currentIndex = Math.min(newDays - 1, previousIndex)
                 }

                 Component.onCompleted: updateModel()

                 delegate: TumblerDelegate {
                     text: formatNumber(modelData)
                 }
             }
             Tumbler {
                 id: monthTumbler

                 onCurrentIndexChanged: dayTumbler.updateModel()

                 model: 12
                 delegate: TumblerDelegate {
                     text: window.locale.standaloneMonthName(modelData, Locale.ShortFormat)
                 }
             }
             Tumbler {
                 id: yearTumbler

                 // This array is populated with the next three years. For example: [2018, 2019, 2020]
                 readonly property var years: (function() {
                     var currentYear = new Date().getFullYear()
                     return [0, 1, 2].map(function(value) { return value + currentYear; })
                 })()

                 model: years
                 delegate: TumblerDelegate {
                     text: formatNumber(modelData)
                 }
             }
         }
     }
 }