matplotlib · ParagBh · Mar 7, 2017
diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
@@ -927,7 +927,7 @@ def __init__(self, tz=None, minticks=5, maxticks=None,
             YEARLY  : [1, 2, 4, 5, 10, 20, 40, 50, 100, 200, 400, 500,
                       1000, 2000, 4000, 5000, 10000],
             MONTHLY : [1, 2, 3, 4, 6],
-            DAILY   : [1, 2, 3, 7, 14],
+            DAILY   : [1, 2, 3, 7, 14, 21],
             HOURLY  : [1, 2, 3, 4, 6, 12],
             MINUTELY: [1, 5, 10, 15, 30],
             SECONDLY: [1, 5, 10, 15, 30],
@@ -951,7 +951,7 @@ def __init__(self, tz=None, minticks=5, maxticks=None,
                        SECONDLY, MICROSECONDLY]
         self.minticks = minticks
 
-        self.maxticks = {YEARLY: 11, MONTHLY: 12, DAILY: 11, HOURLY: 12,
+        self.maxticks = {YEARLY: 11, MONTHLY: 8, DAILY: 6, HOURLY: 12,
                          MINUTELY: 11, SECONDLY: 11, MICROSECONDLY: 8}
         if maxticks is not None:
             try:

diff --git a/lib/matplotlib/tests/baseline_images/test_dates/date_no_tick_overlap.png b/lib/matplotlib/tests/baseline_images/test_dates/date_no_tick_overlap.png
diff --git a/lib/matplotlib/tests/test_dates.py b/lib/matplotlib/tests/test_dates.py
@@ -467,3 +467,12 @@ def test_DayLocator():
 def test_tz_utc():
     dt = datetime.datetime(1970, 1, 1, tzinfo=mdates.UTC)
     dt.tzname()
+
+
+@image_comparison(baseline_images=['date_no_tick_overlap.png'],
+                      extensions=['png'])
+def test_datetime_tick_overlap():
+    #test issue 7712
+    dates = [datetime.datetime(2017,1,i) for i in range(1,30)]
+    values = list(range(1,30))
+    plt.plot(dates, values)