diff --git a/mozilla/calendar/base/content/today-pane.js b/mozilla/calendar/base/content/today-pane.js
index 76a6347207c..544373094e2 100644
--- a/mozilla/calendar/base/content/today-pane.js
+++ b/mozilla/calendar/base/content/today-pane.js
@@ -295,6 +295,11 @@ setDaywithjsDate: function(aNewDate)
   {
     return (sameDay(today(), this.start));
   },
+  
+  showsYesterday: function()
+  {
+    return (sameDay(yesterday(), this.start));
+  },
 
   updatePeriod: function()
   {
diff --git a/mozilla/calendar/lightning/content/messenger-overlay-sidebar.js b/mozilla/calendar/lightning/content/messenger-overlay-sidebar.js
index 1b4048bb3ff..27c50b0e5d9 100644
--- a/mozilla/calendar/lightning/content/messenger-overlay-sidebar.js
+++ b/mozilla/calendar/lightning/content/messenger-overlay-sidebar.js
@@ -187,6 +187,13 @@ function today()
     return d.getInTimezone(calendarDefaultTimezone());
 }
 
+function yesterday()
+{
+    var d = today();
+    d.day--;
+    return d;
+}
+
 function nextMonth(dt)
 {
     var d = new Date(dt);
@@ -448,11 +455,11 @@ function refreshUIBits() {
         cView.goToDay(cView.selectedDay);
     }
 
-    // schedule our next update...
-    scheduleMidnightUpdate(refreshUIBits);
-    if (TodayPane.showsToday()) {
+    if (TodayPane.showsYesterday()) {
       TodayPane.setDay(today());
     }
+    // schedule our next update...
+    scheduleMidnightUpdate(refreshUIBits);
 }
 
 function showCalendarView(type)