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diff --git a/lisp/ChangeLog b/lisp/ChangeLog
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--- a/lisp/ChangeLog
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@@ -1,3 +1,23 @@
+2012-11-17  Jay Belanger  <jay.p.belanger@gmail.com>
+
+        * calc/calc.el (calc-gregorian-switch): New variable.
+
+        * calc/calc-forms.el (math-day-in-year, math-dt-before-p)
+        (math-absolute-from-gregorian-dt, math-absolute-from-julian-dt)
+        (math-date-to-julian-dt, math-date-to-gregorian-dt): New functions.
+        (math-leap-year-p): Add option to distinguish between Julian
+        and Gregorian calendars.
+        (math-day-number): Use `math-day-in-year' to do the computations.
+        (math-absolute-from-dt): Rename from `math-absolute-from-date'.
+        Use `math-absolute-from-gregorian' and `math-absolute-from-julian'
+        to do the computations.
+        (math-date-to-dt): Use `math-date-to-julian-dt' and
+        `math-date-to-gregorian-dt' to do the computations.
+        (calcFunc-weekday, math-format-date-part): Use the new version of
+        the DATE to determine the weekday.
+        (calcFunc-newmonth, calcFunc-newyear): Use `calc-gregorian-switch'
+        when necessary.
+
 2012-11-17  Eli Zaretskii  <eliz@gnu.org>
 
         * term/w32-win.el (w32-handle-dropped-file): Use 'file://' only on