diff --git a/Source/DayView.swift b/Source/DayView.swift
index 9d71f8e9..f5d4e9ee 100644
--- a/Source/DayView.swift
+++ b/Source/DayView.swift
@@ -50,8 +50,8 @@ public final class DayView: UIView, TimelinePagerViewDelegate {
     }
   }
 
-  public let dayHeaderView: DayHeaderView
-  public let timelinePagerView: TimelinePagerView
+  public private(set) var dayHeaderView: DayHeaderView
+  public private(set) var timelinePagerView: TimelinePagerView
 
   public var state: DayViewState? {
     didSet {
@@ -60,7 +60,22 @@ public final class DayView: UIView, TimelinePagerViewDelegate {
     }
   }
 
-  public var calendar: Calendar = Calendar.autoupdatingCurrent
+  public var calendar: Calendar = Calendar.autoupdatingCurrent {
+    didSet {
+      // TODO: Should we observe calendar in state rather then change it manualy?
+      dayHeaderView.calendar = self.calendar
+      timelinePagerView.calendar = self.calendar
+
+      let date = self.state?.selectedDate ?? Date()
+      let newState = DayViewState(date: date, calendar: calendar)
+      newState.move(to: date)
+      state = newState
+      
+      // TODO: Shound we redraw dayView and its subvies? Or we should do this when calendar in state was changed?
+//      setNeedsDisplay()
+//      self.subviews.forEach { $0.setNeedsDisplay() }
+    }
+  }
 
   private var style = CalendarStyle()
 
diff --git a/Source/Header/DayHeaderView.swift b/Source/Header/DayHeaderView.swift
index bb130d98..ece91cd9 100644
--- a/Source/Header/DayHeaderView.swift
+++ b/Source/Header/DayHeaderView.swift
@@ -4,7 +4,7 @@ import DateToolsSwift
 
 public final class DayHeaderView: UIView, DaySelectorDelegate, DayViewStateUpdating, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
   public private(set) var daysInWeek = 7
-  public let calendar: Calendar
+  public var calendar: Calendar
 
   private var style = DayHeaderStyle()
   private var currentSizeClass = UIUserInterfaceSizeClass.compact
diff --git a/Source/Timeline/TimelinePagerView.swift b/Source/Timeline/TimelinePagerView.swift
index f0a68d92..0cf9efb8 100644
--- a/Source/Timeline/TimelinePagerView.swift
+++ b/Source/Timeline/TimelinePagerView.swift
@@ -20,7 +20,14 @@ public final class TimelinePagerView: UIView, UIGestureRecognizerDelegate, UIScr
   public weak var dataSource: EventDataSource?
   public weak var delegate: TimelinePagerViewDelegate?
 
-  public private(set) var calendar: Calendar = Calendar.autoupdatingCurrent
+  public var calendar: Calendar = Calendar.autoupdatingCurrent {
+    didSet {
+      pagingViewController.viewControllers?.forEach {
+        let vc = $0 as! TimelineContainerController
+        vc.timeline.calendar = calendar
+      }
+    }
+  }
 
   public var timelineScrollOffset: CGPoint {
     // Any view is fine as they are all synchronized