MNT: change default dates to 1970-01-01 to -02

jklymak · jklymak · commit 0810891e775f · 2022-06-02T09:47:11.000+02:00
diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
@@ -1157,9 +1157,9 @@ def nonsingular(self, vmin, vmax):
         if it is too close to being singular (i.e. a range of ~0).
         """
         if not np.isfinite(vmin) or not np.isfinite(vmax):
-            # Except if there is no data, then use 2000-2010 as default.
-            return (date2num(datetime.date(2000, 1, 1)),
-                    date2num(datetime.date(2010, 1, 1)))
+            # Except if there is no data, then use 1970 as default.
+            return (date2num(datetime.date(1970, 1, 1)),
+                    date2num(datetime.date(1970, 1, 2)))
         if vmax < vmin:
             vmin, vmax = vmax, vmin
         unit = self._get_unit()
@@ -1362,9 +1362,9 @@ def nonsingular(self, vmin, vmax):
         # whatever is thrown at us, we can scale the unit.
         # But default nonsingular date plots at an ~4 year period.
         if not np.isfinite(vmin) or not np.isfinite(vmax):
-            # Except if there is no data, then use 2000-2010 as default.
-            return (date2num(datetime.date(2000, 1, 1)),
-                    date2num(datetime.date(2010, 1, 1)))
+            # Except if there is no data, then use 1970 as default.
+            return (date2num(datetime.date(1970, 1, 1)),
+                    date2num(datetime.date(1970, 1, 2)))
         if vmax < vmin:
             vmin, vmax = vmax, vmin
         if vmin == vmax:
@@ -1850,8 +1850,8 @@ def axisinfo(self, unit, axis):
         majloc = AutoDateLocator(tz=tz,
                                  interval_multiples=self._interval_multiples)
         majfmt = AutoDateFormatter(majloc, tz=tz)
-        datemin = datetime.date(2000, 1, 1)
-        datemax = datetime.date(2010, 1, 1)
+        datemin = datetime.date(1970, 1, 1)
+        datemax = datetime.date(1970, 1, 2)
 
         return units.AxisInfo(majloc=majloc, majfmt=majfmt, label='',
                               default_limits=(datemin, datemax))
@@ -1907,8 +1907,8 @@ def axisinfo(self, unit, axis):
                                       zero_formats=self._zero_formats,
                                       offset_formats=self._offset_formats,
                                       show_offset=self._show_offset)
-        datemin = datetime.date(2000, 1, 1)
-        datemax = datetime.date(2010, 1, 1)
+        datemin = datetime.date(1970, 1, 1)
+        datemax = datetime.date(1970, 1, 2)
         return units.AxisInfo(majloc=majloc, majfmt=majfmt, label='',
                               default_limits=(datemin, datemax))
 
