Absolute value must apply to timedelta object as well as reslative delta object.

pganssle · pganssle · commit ca284d12f805 · 2014-12-26T18:59:35.000-06:00
Signed-off-by: Paul G &lt;p.ganssle@gmail.com&gt;
diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
@@ -955,6 +955,7 @@ def get_locator(self, dmin, dmax):
         # take absolute difference
         if dmin > dmax:
             delta = -delta
+            tdelta = -tdelta
 
         numYears = delta.years * 1.0
         numMonths = (numYears * MONTHS_PER_YEAR) + delta.months
