diff --git a/src/main/java/org/richfaces/renderkit/ScheduleRendererBase.java b/src/main/java/org/richfaces/renderkit/ScheduleRendererBase.java
index 2d6fd61..cedecef 100644
--- a/src/main/java/org/richfaces/renderkit/ScheduleRendererBase.java
+++ b/src/main/java/org/richfaces/renderkit/ScheduleRendererBase.java
@@ -61,7 +61,7 @@ public abstract class ScheduleRendererBase extends AjaxComponentRendererBase {
         Map<String, Object> defaults = new HashMap<String, Object>();
         defaults.put("styleClass", "");
         defaults.put("defaultView", UISchedule.DEFAULT_VIEW);
-        defaults.put("firstDay", UISchedule.DEFAULT_FIRST_DAY);
+        defaults.put("firstDay", UISchedule.DEFAULT_FIRST_DAY - 1);
         defaults.put("isRTL", UISchedule.DEFAULT_RTL);
         defaults.put("weekends", UISchedule.DEFAULT_SHOW_WEEKENDS);
         defaults.put("weekMode", UISchedule.DEFAULT_WEEK_MODE);