From fc6290e5394287a13235720cd1cc5a0c2eca7f5a Mon Sep 17 00:00:00 2001
From: Christian Mollekopf <chrigi_1@fastmail.fm>
Date: Mon, 20 Aug 2018 09:20:02 +0200
Subject: Display the week number

---
 views/calendar/qml/WeekView.qml | 46 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/views/calendar/qml/WeekView.qml b/views/calendar/qml/WeekView.qml
index 2d16b772..80e41bea 100644
--- a/views/calendar/qml/WeekView.qml
+++ b/views/calendar/qml/WeekView.qml
@@ -32,6 +32,37 @@ FocusScope {
     property date startDate: currentDate
     property var calendarFilter
 
+    /**
+    * Returns the week number for this date.  dowOffset is the day of week the week
+    * "starts" on for your locale - it can be from 0 to 6. If dowOffset is 1 (Monday),
+    * the week returned is the ISO 8601 week number.
+    * @param int dowOffset
+    * @return int
+    */
+    function getWeek(date, dowOffset) {
+        var newYear = new Date(date.getFullYear(),0,1);
+        var day = newYear.getDay() - dowOffset; //the day of week the year begins on
+        day = (day >= 0 ? day : day + 7);
+        var daynum = Math.floor((date.getTime() - newYear.getTime() - 
+        (date.getTimezoneOffset()-newYear.getTimezoneOffset())*60000)/86400000) + 1;
+        var weeknum;
+        //if the year starts before the middle of a week
+        if(day < 4) {
+            weeknum = Math.floor((daynum+day-1)/7) + 1;
+            if(weeknum > 52) {
+                nYear = new Date(date.getFullYear() + 1,0,1);
+                nday = nYear.getDay() - dowOffset;
+                nday = nday >= 0 ? nday : nday + 7;
+                /*if the next year starts before the middle of
+                the week, it is week #1 of that year*/
+                weeknum = nday < 4 ? 1 : 53;
+            }
+        }
+        else {
+            weeknum = Math.floor((daynum+day-1)/7);
+        }
+        return weeknum;
+    }
     Item {
         anchors {
             top: parent.top
@@ -42,6 +73,21 @@ FocusScope {
         width: root.dayWidth * root.daysToShow + Kube.Units.gridUnit * 2
         height: root.height
 
+        Item {
+            id: weekNumber
+            anchors {
+                top: parent.top
+                left: parent.left
+            }
+            width: Kube.Units.gridUnit * 2
+            height: Kube.Units.gridUnit * 2
+            Label {
+                anchors.centerIn: parent
+                text: getWeek(startDate, 1)
+                font.bold: true
+            }
+        }
+
         DayLabels {
             id: dayLabels
             anchors.top: parent.top
-- 
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