From 9d44e637db603417be2716f6c1902527085ec0c5 Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Tue, 10 May 2016 19:47:02 -0400
Subject: [PATCH] BUG: mpl fix to AutoDatFromatter to fix second/us-second
 formatters

revert part of #11770
xref: https://github.com/matplotlib/matplotlib/issues/6365

closes #13131

The mistake in #11770 was missing that pandas had a 1/us not 1/s
scaled bucket.
---
 doc/source/whatsnew/v0.18.2.txt |  1 +
 pandas/tseries/converter.py     | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/doc/source/whatsnew/v0.18.2.txt b/doc/source/whatsnew/v0.18.2.txt
index 251fb4c139b04..907ca6f185e0a 100644
--- a/doc/source/whatsnew/v0.18.2.txt
+++ b/doc/source/whatsnew/v0.18.2.txt
@@ -141,6 +141,7 @@ Bug Fixes
 - Bug in ``SparseDataFrame`` in which ``axis=None`` did not default to ``axis=0`` (:issue:`13048`)
 - Bug in ``SparseSeries`` and ``SparseDataFrame`` creation with ``object`` dtype may raise ``TypeError`` (:issue:`11633`)
 - Bug when passing a not-default-indexed ``Series`` as ``xerr`` or ``yerr`` in ``.plot()`` (:issue:`11858`)
+- Bug in matplotlib ``AutoDataFormatter``; this restores the second scaled formatting and re-adds micro-second scaled formatting (:issue:`13131`)
 
 
 - Bug in ``.groupby(..).resample(..)`` when the same object is called multiple times (:issue:`13174`)
diff --git a/pandas/tseries/converter.py b/pandas/tseries/converter.py
index 8ccfdfa05e9b5..78b185ae8cf31 100644
--- a/pandas/tseries/converter.py
+++ b/pandas/tseries/converter.py
@@ -23,6 +23,24 @@
 from pandas.tseries.frequencies import FreqGroup
 from pandas.tseries.period import Period, PeriodIndex
 
+# constants
+HOURS_PER_DAY = 24.
+MIN_PER_HOUR = 60.
+SEC_PER_MIN = 60.
+
+SEC_PER_HOUR = SEC_PER_MIN * MIN_PER_HOUR
+SEC_PER_DAY = SEC_PER_HOUR * HOURS_PER_DAY
+
+MUSEC_PER_DAY = 1e6 * SEC_PER_DAY
+
+
+def _mpl_le_2_0_0():
+    try:
+        import matplotlib
+        return matplotlib.compare_versions('2.0.0', matplotlib.__version__)
+    except ImportError:
+        return False
+
 
 def register():
     units.registry[lib.Timestamp] = DatetimeConverter()
@@ -221,6 +239,13 @@ def __init__(self, locator, tz=None, defaultfmt='%Y-%m-%d'):
         if self._tz is dates.UTC:
             self._tz._utcoffset = self._tz.utcoffset(None)
 
+        # For mpl > 2.0 the format strings are controlled via rcparams
+        # so do not mess with them.  For mpl < 2.0 change the second
+        # break point and add a musec break point
+        if _mpl_le_2_0_0():
+            self.scaled[1. / SEC_PER_DAY] = '%H:%M:%S'
+            self.scaled[1. / MUSEC_PER_DAY] = '%H:%M:%S.%f'
+
 
 class PandasAutoDateLocator(dates.AutoDateLocator):