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+``constant``
+============
+
+.. versionadded: 1.12.1
+    constant now accepts object instances as the second argument.
+
+``constant`` returns the constant value for a given string:
+
+.. code-block:: jinja
+
+    {{ some_date|date(constant('DATE_W3C')) }}
+    {{ constant('Namespace\\Classname::CONSTANT_NAME') }}
+
+As of 1.12.1 you can read constants from object instances as well:
+
+.. code-block:: jinja
+
+    {{ constant('RSS', date) }}