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+PRTimeParamFn
+=============
+
+This type defines a callback function to calculate and return the time
+parameter offsets from a calendar time object in GMT.
+
+
+Syntax
+------
+
+.. code::
+
+ #include <prtime.h>
+
+ typedef PRTimeParameters (PR_CALLBACK_DECL *PRTimeParamFn)
+ (const PRExplodedTime *gmt);
+
+
+Description
+-----------
+
+The type :ref:`PRTimeParamFn` represents a callback function that, when
+given a time instant in GMT, returns the time zone information (offset
+from GMT and DST offset) at that time instant.