diff --git a/KDCalendar/Base.lproj/Main.storyboard b/KDCalendar/Base.lproj/Main.storyboard
index e14bd14..f801b4c 100644
--- a/KDCalendar/Base.lproj/Main.storyboard
+++ b/KDCalendar/Base.lproj/Main.storyboard
@@ -1,12 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13771" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="vXZ-lx-hvc">
-    <device id="retina4_7" orientation="portrait">
-        <adaptation id="fullscreen"/>
-    </device>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="16096" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="vXZ-lx-hvc">
+    <device id="retina4_7" orientation="portrait" appearance="light"/>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13772"/>
-        <capability name="Aspect ratio constraints" minToolsVersion="5.1"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="16087"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -23,23 +20,20 @@
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                         <subviews>
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="hW4-le-uM3" customClass="CalendarView" customModule="CalendarView" customModuleProvider="target">
-                                <rect key="frame" x="16" y="36" width="343" height="343"/>
+                                <rect key="frame" x="16" y="16" width="343" height="343"/>
                                 <color key="backgroundColor" red="0.94004629629629632" green="0.80393518518518514" blue="0.87748842592592591" alpha="0.87" colorSpace="custom" customColorSpace="sRGB"/>
                                 <constraints>
                                     <constraint firstAttribute="width" secondItem="hW4-le-uM3" secondAttribute="height" id="773-eW-lgj"/>
                                 </constraints>
                             </view>
-                            <datePicker contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" datePickerMode="date" minuteInterval="1" translatesAutoresizingMaskIntoConstraints="NO" id="ZI5-5E-Eq0">
+                            <datePicker contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" datePickerMode="date" translatesAutoresizingMaskIntoConstraints="NO" id="ZI5-5E-Eq0">
                                 <rect key="frame" x="16" y="431" width="343" height="216"/>
-                                <date key="date" timeIntervalSinceReferenceDate="482061469.277242">
-                                    <!--2016-04-11 09:57:49 +0000-->
-                                </date>
                                 <connections>
                                     <action selector="onValueChange:" destination="vXZ-lx-hvc" eventType="valueChanged" id="YJA-Ef-5x9"/>
                                 </connections>
                             </datePicker>
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="BMl-ka-oh2">
-                                <rect key="frame" x="16" y="387" width="343" height="30"/>
+                                <rect key="frame" x="16" y="367" width="343" height="30"/>
                                 <subviews>
                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="d9N-eH-E3w">
                                         <rect key="frame" x="8" y="0.0" width="154" height="30"/>
@@ -79,9 +73,25 @@
                                     <constraint firstItem="ybt-dF-Rdi" firstAttribute="centerX" secondItem="BMl-ka-oh2" secondAttribute="centerX" id="vAu-hH-jPT"/>
                                 </constraints>
                             </view>
+                            <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="IEC-Gh-pGE">
+                                <rect key="frame" x="302" y="405" width="51" height="31"/>
+                                <connections>
+                                    <action selector="rangleSelectionEnabledToggled:" destination="vXZ-lx-hvc" eventType="valueChanged" id="HA1-Qc-RLd"/>
+                                </connections>
+                            </switch>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="enable range selection" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="iqZ-iY-gSd">
+                                <rect key="frame" x="165.5" y="413.5" width="128.5" height="14.5"/>
+                                <constraints>
+                                    <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="128.5" id="jH2-7N-igb"/>
+                                </constraints>
+                                <fontDescription key="fontDescription" style="UICTFontTextStyleCaption1"/>
+                                <color key="textColor" white="0.33333333333333331" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                <nil key="highlightedColor"/>
+                            </label>
                         </subviews>
                         <color key="backgroundColor" red="0.94178299492385786" green="0.94178299492385786" blue="0.94178299492385786" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <constraints>
+                            <constraint firstItem="IEC-Gh-pGE" firstAttribute="top" secondItem="ETR-rE-QOo" secondAttribute="bottom" constant="8" id="3aC-SB-LGi"/>
                             <constraint firstItem="ZI5-5E-Eq0" firstAttribute="leading" secondItem="kh9-bI-dsS" secondAttribute="leading" constant="16" id="6CH-G3-Mhc"/>
                             <constraint firstItem="BMl-ka-oh2" firstAttribute="leading" secondItem="hW4-le-uM3" secondAttribute="leading" id="7Z1-Xk-xnJ"/>
                             <constraint firstItem="hW4-le-uM3" firstAttribute="leading" secondItem="kh9-bI-dsS" secondAttribute="leading" constant="16" id="8wO-aF-0Eb"/>
@@ -89,8 +99,12 @@
                             <constraint firstItem="BMl-ka-oh2" firstAttribute="top" secondItem="hW4-le-uM3" secondAttribute="bottom" constant="8" id="KWY-nY-Oys"/>
                             <constraint firstItem="hW4-le-uM3" firstAttribute="top" secondItem="jyV-Pf-zRb" secondAttribute="bottom" constant="16" id="MZh-zF-zaS"/>
                             <constraint firstItem="BMl-ka-oh2" firstAttribute="trailing" secondItem="hW4-le-uM3" secondAttribute="trailing" id="Prb-A3-Qwc"/>
+                            <constraint firstItem="iqZ-iY-gSd" firstAttribute="leading" secondItem="kh9-bI-dsS" secondAttribute="leading" priority="250" constant="165.5" id="U2e-mI-54R"/>
+                            <constraint firstItem="IEC-Gh-pGE" firstAttribute="leading" secondItem="iqZ-iY-gSd" secondAttribute="trailing" constant="8" id="Xek-LA-BMT"/>
+                            <constraint firstItem="iqZ-iY-gSd" firstAttribute="centerY" secondItem="IEC-Gh-pGE" secondAttribute="centerY" id="fUF-2g-vwI"/>
                             <constraint firstAttribute="trailing" secondItem="ZI5-5E-Eq0" secondAttribute="trailing" constant="16" id="jgi-JH-Dcg"/>
                             <constraint firstAttribute="trailing" secondItem="hW4-le-uM3" secondAttribute="trailing" constant="16" id="vYW-BD-MiV"/>
+                            <constraint firstItem="IEC-Gh-pGE" firstAttribute="trailing" secondItem="ETR-rE-QOo" secondAttribute="trailing" id="zFx-dn-rD1"/>
                         </constraints>
                     </view>
                     <connections>
diff --git a/KDCalendar/CalendarView/CalendarView+Delegate.swift b/KDCalendar/CalendarView/CalendarView+Delegate.swift
index 5a2bbde..0a9c215 100644
--- a/KDCalendar/CalendarView/CalendarView+Delegate.swift
+++ b/KDCalendar/CalendarView/CalendarView+Delegate.swift
@@ -26,15 +26,20 @@
 import UIKit
 
 extension CalendarView: UICollectionViewDelegateFlowLayout {
-    
+
     public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
         
         guard let date = self.dateFromIndexPath(indexPath) else { return }
         
         if let index = selectedIndexPaths.firstIndex(of: indexPath) {
-            
-            delegate?.calendar(self, didDeselectDate: date)
-            if enableDeslection {
+            handleCollectionViewDidDeselectDate(date)
+            if enableDeselection {
+                // bug: when deselecting the second to last item programmatically, during
+                // didDeselectDate delegation, the index returned is out of the bounds of
+                // the selectedIndexPaths array.  This guard prevents the crash
+                guard index < selectedIndexPaths.count, index < selectedDates.count else {
+                    return
+                }
                 selectedIndexPaths.remove(at: index)
                 selectedDates.remove(at: index)
             }
@@ -44,17 +49,8 @@ extension CalendarView: UICollectionViewDelegateFlowLayout {
                 self.reloadData()
                 return
             }
-            
-            if !multipleSelectionEnable {
-                selectedIndexPaths.removeAll()
-                selectedDates.removeAll()
-            }
-            
-            selectedIndexPaths.append(indexPath)
-            selectedDates.append(date)
-            
-            let eventsForDaySelected = eventsByIndexPath[indexPath] ?? []
-            delegate?.calendar(self, didSelectDate: date, withEvents: eventsForDaySelected)
+
+            handleCollectionViewDidSelectDate(date, indexPath: indexPath)
         }
         
         self.reloadData()
diff --git a/KDCalendar/CalendarView/CalendarView.swift b/KDCalendar/CalendarView/CalendarView.swift
index 586b168..436aa67 100644
--- a/KDCalendar/CalendarView/CalendarView.swift
+++ b/KDCalendar/CalendarView/CalendarView.swift
@@ -28,12 +28,6 @@ import UIKit
 import EventKit
 #endif
 
-struct EventLocation {
-    let title: String
-    let latitude: Double
-    let longitude: Double
-}
-
 public struct CalendarEvent {
     public let title: String
     public let startDate: Date
@@ -84,6 +78,12 @@ extension CalendarViewDelegate {
 }
 
 public class CalendarView: UIView {
+
+    public enum MultipleSelectionMode {
+        case single
+        case multiple
+        case range
+    }
     
     public let cellReuseIdentifier = "CalendarDayCell"
     
@@ -144,8 +144,19 @@ public class CalendarView: UIView {
     // MARK: - public
     
     public internal(set) var displayDate: Date?
-    public var multipleSelectionEnable = true
-    public var enableDeslection = true
+
+    @available(*, deprecated, message: "Use `multipleSelectionMode` instead. `multipleSelectionEnable` equates to `multipleSelectionMode == .multiple`")
+    public var multipleSelectionEnable: Bool {
+        set (val) {
+            self.multipleSelectionMode = .multiple
+        }
+        get {
+            return self.multipleSelectionMode == .multiple
+        }
+    }
+
+    public var multipleSelectionMode: MultipleSelectionMode = .multiple
+    public var enableDeselection = true
     public var marksWeekends = true
     
     public var delegate: CalendarViewDelegate?
@@ -330,7 +341,98 @@ public class CalendarView: UIView {
     internal func updateStyle() {
         self.headerView?.style = style
     }
-    
+
+    internal func clearAllSelected() {
+        let wereSelectedDates = selectedDates.map{ $0 }
+        selectedIndexPaths.removeAll()
+        selectedDates.removeAll()
+        self.reloadData()
+        wereSelectedDates.forEach {delegate?.calendar(self, didDeselectDate: $0)}
+    }
+
+    // soft lock on selecting range
+    private var selectingRange = false
+
+    internal func selectRange(for dateSelected: Date) {
+        // while selecting range, let it finish
+        guard !selectingRange else {
+            return
+        }
+
+        let sortedDates = selectedDates.sorted()
+        // if more than one date, select a range
+        guard sortedDates.count > 1,
+            let startDate = sortedDates.first,
+            let endDate = sortedDates.last else {
+                return
+        }
+
+        // start selecting range
+        selectingRange = true
+        // complete selecting range upon exit
+        defer {selectingRange = false}
+        // count the days
+        let days = Calendar.current.dateComponents([.day], from: startDate, to: endDate).day ?? 1
+        // map to range of dates
+        let dates = stride(from: 0, to: days, by: 1)
+            .map { Calendar.current.date(byAdding: .day, value: $0, to: startDate) ?? Date() }
+        // select each date
+        dates.forEach { candiDate in
+            if !sortedDates.contains(candiDate) {
+                // selectDate will call delegate `calendar(_:, didSelectDate:, withEvents:)`
+                selectDate(candiDate)
+            }
+        }
+
+    }
+
+    internal func deselectRange(for unselectedDate: Date) {
+        guard selectedDates.count > 1,
+            let startDate = selectedDates.min(),
+            let endDate = selectedDates.max(),
+            startDate.compare(unselectedDate) == .orderedAscending,
+            unselectedDate.compare(endDate) == .orderedAscending else {
+                delegate?.calendar(self, didDeselectDate: unselectedDate)
+                return
+        }
+
+        clearAllSelected()
+
+    }
+
+    internal func handleCollectionViewDidSelectDate(_ date: Date, indexPath: IndexPath) {
+        // for single select, clear the selection
+        switch multipleSelectionMode {
+        case .single:
+            clearAllSelected()
+        case .multiple, .range:
+            break
+        }
+
+        selectedIndexPaths.append(indexPath)
+        selectedDates.append(date)
+
+        // for range select, select the range in the middle
+        switch multipleSelectionMode {
+        case .single, .multiple:
+            break
+        case .range:
+            selectRange(for: date)
+        }
+
+        let eventsForDaySelected = eventsByIndexPath[indexPath] ?? []
+        delegate?.calendar(self, didSelectDate: date, withEvents: eventsForDaySelected)
+    }
+
+    internal func handleCollectionViewDidDeselectDate(_ date: Date) {
+        switch multipleSelectionMode {
+        case .range where selectedDates.count > 1:
+            deselectRange(for: date)
+        case .single, .multiple, .range:
+            delegate?.calendar(self, didDeselectDate: date)
+        }
+    }
+
     func scrollViewOffset(for date: Date) -> CGPoint {
         var point = CGPoint.zero
         
@@ -473,6 +575,15 @@ extension CalendarView {
         goToMonthWithOffet(-1)
     }
 
+    /*
+     method: - clearAllSelectedDates
+     function: - clear all selected dates
+     */
+    public func clearAllSelectedDates() {
+        clearAllSelected()
+    }
+
+
     #if KDCALENDAR_EVENT_MANAGER_ENABLED
     
     public func loadEvents(onComplete: ((Error?) -> Void)? = nil) {
diff --git a/KDCalendar/ViewController.swift b/KDCalendar/ViewController.swift
index 10dbbea..2ce6e96 100644
--- a/KDCalendar/ViewController.swift
+++ b/KDCalendar/ViewController.swift
@@ -30,11 +30,14 @@ import EventKit
 
 class ViewController: UIViewController {
 
-    
+    private let defaultSelectionMode: CalendarView.MultipleSelectionMode =  .multiple
     @IBOutlet weak var calendarView: CalendarView!
     @IBOutlet weak var datePicker: UIDatePicker!
-    
-    
+
+    @IBAction func rangleSelectionEnabledToggled(_ sender: UISwitch) {
+        calendarView.multipleSelectionMode = sender.isOn ? .range : defaultSelectionMode
+    }
+
     override func viewDidLoad() {
         
         super.viewDidLoad()
@@ -70,7 +73,7 @@ class ViewController: UIViewController {
         calendarView.delegate = self
         
         calendarView.direction = .horizontal
-        calendarView.multipleSelectionEnable = false
+        calendarView.multipleSelectionMode = defaultSelectionMode
         calendarView.marksWeekends = true
         
         
@@ -127,8 +130,7 @@ class ViewController: UIViewController {
     
     override var prefersStatusBarHidden: Bool {
         return true
-    }
-    
+    } 
 }
 
 
diff --git a/README.md b/README.md
index b764964..fc091af 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ Just the files from the **CalendarView/** subfolder to your project.
 
 # Setup
 
-The calendar is a `UIView` and can be added either programmatically or via a XIB/Storyboard. **If doing the latter, make sure that the Module is selected to be 'KDCalendar'**.
+The calendar is a `UIView` and can be added either programmatically or via a XIB/Storyboard. **If doing the latter, make sure that the Module is selected to be 'KDCalendar'  ('CalendarView_iOS') if installed via Carthage)**.
 
 ![IB Screenshot](https://github.com/mmick66/CalendarView/blob/master/Assets/Screenshot.png)
 
@@ -81,7 +81,7 @@ Note: The dates should be in UTC (same as GMT)
 
 # How to Use
 
-You would want to implement the delegate functions inside your view controller as they appear in the example project.
+You would want to implement the delegate functions inside your view controller as they appear in the example project.  Don't forget to assign your class as the `CalendarView` delegate.
 
 Say you want to be able to scroll 3 months into the past, then:
 
@@ -129,12 +129,18 @@ Similarly you can deselect:
 self.calendarView.deselectDate(date)
 ```
 
-You can get all the dates that were selected, either manually or programatically using:
+You can get all the dates that were selected, either manually or programmatically using:
 
 ```Swift
 self.calendarView.selectedDates
 ```
 
+To support selecting a range of dates where any selection will automatically select all dates in between, use:
+
+```Swift
+self.calendarView.multipleSelectionMode = .range 
+```
+
 ### Layout
 
 The calendar supports two basic layouts. Set the `direction` property to `.horizontal` or `.vertical`: