diff --git a/CHANGELOG b/CHANGELOG
index c3d6508a12..a0eace7480 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Add day view on calendar
 * Raise NotImplementedError when setting Function field without setter
 * Add exports in view_toolbar_get
 * Add resources method to ModelStorage
diff --git a/doc/topics/views/index.rst b/doc/topics/views/index.rst
index 0ad74602d8..717951a233 100644
--- a/doc/topics/views/index.rst
+++ b/doc/topics/views/index.rst
@@ -804,7 +804,8 @@ Each calendar view must start with this tag.
     * ``dtend``: The name of the field that contains the end date.
 
     * ``mode``: An optional name for the view that will be used first.
-      Available views are: `week` and `month`. The default value is `month`.
+      Available views are: `day`, `week` and `month`. The default value is 
+      `month`.
 
     * ``color``: An optional field name that contains the text color for the
       event. The default value is `black`.
diff --git a/trytond/ir/ui/calendar.rnc b/trytond/ir/ui/calendar.rnc
index 66d7082a6d..1a3e9e4e7d 100644
--- a/trytond/ir/ui/calendar.rnc
+++ b/trytond/ir/ui/calendar.rnc
@@ -6,7 +6,8 @@ attlist.calendar &=
 attlist.calendar &=
   attribute dtend { text }?
 attlist.calendar &=
-  attribute mode { "week"
+  attribute mode { "day"
+      | "week"
       | "month" }?
 attlist.calendar &=
    [ a:defaultValue = "black" ] attribute color { text }?
diff --git a/trytond/ir/ui/calendar.rng b/trytond/ir/ui/calendar.rng
index 93e47daf30..8ea1a13fbf 100644
--- a/trytond/ir/ui/calendar.rng
+++ b/trytond/ir/ui/calendar.rng
@@ -29,6 +29,7 @@
       <attribute>
         <name ns="">mode</name>
         <choice>
+          <value>day</value>
           <value>week</value>
           <value>month</value>
         </choice>