Fixed a bug in RRuleLocator that generated invalid datetimes when padding the axes bounds for large ranges of times or with times that are close to the boundaries of valid datetimes.

James Evans · James Evans · commit 1451d5c9bcc0 · 2009-02-03T22:29:30.000Z
svn path=/trunk/matplotlib/; revision=6872
diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
@@ -481,7 +481,20 @@ def __call__(self):
         if dmin>dmax:
             dmax, dmin = dmin, dmax
         delta = relativedelta(dmax, dmin)
-        self.rule.set(dtstart=dmin-delta, until=dmax+delta)
+
+        # We need to cap at the endpoints of valid datetime
+        try:
+            start = dmin - delta
+        except ValueError:
+            start = _from_ordinalf( 1.0 )
+
+        try:
+            stop = dmax + delta
+        except ValueError:
+            # The magic number!
+            stop = _from_ordinalf( 3652059.9999999 )
+
+        self.rule.set(dtstart=start, until=stop)
         dates = self.rule.between(dmin, dmax, True)
         return date2num(dates)
 
@@ -518,7 +531,20 @@ def autoscale(self):
             dmax, dmin = dmin, dmax
 
         delta = relativedelta(dmax, dmin)
-        self.rule.set(dtstart=dmin-delta, until=dmax+delta)
+
+        # We need to cap at the endpoints of valid datetime
+        try:
+            start = dmin - delta
+        except ValueError:
+            start = _from_ordinalf( 1.0 )
+
+        try:
+            stop = dmax + delta
+        except ValueError:
+            # The magic number!
+            stop = _from_ordinalf( 3652059.9999999 )
+
+        self.rule.set(dtstart=start, until=stop)
         dmin, dmax = self.datalim_to_dt()
 
 
