From 75e9ebedab50fc8e1cb45d1a34bfad902220994a Mon Sep 17 00:00:00 2001
From: zMendes <38051204+zMendes@users.noreply.github.com>
Date: Tue, 26 Oct 2021 22:14:56 -0300
Subject: [PATCH 1/2] TST: test_join_multiindex_dates

---
 pandas/tests/frame/methods/test_join.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/pandas/tests/frame/methods/test_join.py b/pandas/tests/frame/methods/test_join.py
index 30118d20f67a9..5bb8d157b66c7 100644
--- a/pandas/tests/frame/methods/test_join.py
+++ b/pandas/tests/frame/methods/test_join.py
@@ -323,6 +323,29 @@ def test_join_multiindex_leftright(self):
         tm.assert_frame_equal(df1.join(df2, how="right"), exp)
         tm.assert_frame_equal(df2.join(df1, how="left"), exp[["value2", "value1"]])
 
+    def test_join_multiindex_dates(self):
+        # GH 33692
+        date = pd.Timestamp(2000, 1, 1).date()
+
+        # creates dataframes
+        df1 = DataFrame({"index_0": 0, "date": date, "col1": [0]})
+        df2 = DataFrame({"index_0": 0, "date": date, "col2": [0]})
+        df1 = df1.groupby(by=["index_0", "date"]).first()
+        df2 = df2.groupby(by=["index_0", "date"]).first()
+
+        multi_index = MultiIndex.from_tuples([(0, date)], names=["index_0", "date"])
+        df3 = DataFrame(index=multi_index, columns=["col3"], data=[0])
+
+        expected = (
+            DataFrame(
+                {"index_0": 0, "date": date, "col1": [0], "col2": [0], "col3": [0]}
+            )
+            .groupby(by=["index_0", "date"])
+            .first()
+        )
+        result = df1.join([df2, df3])
+        tm.assert_equal(result, expected)
+
     def test_merge_join_different_levels(self):
         # GH#9455
 

From f8fd4e4329276d139fcfd4d61475477f602ff18e Mon Sep 17 00:00:00 2001
From: zMendes <38051204+zMendes@users.noreply.github.com>
Date: Wed, 27 Oct 2021 00:06:07 -0300
Subject: [PATCH 2/2] Removed unecessary methods from test

---
 pandas/tests/frame/methods/test_join.py | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/pandas/tests/frame/methods/test_join.py b/pandas/tests/frame/methods/test_join.py
index 5bb8d157b66c7..3e06b96b1cb07 100644
--- a/pandas/tests/frame/methods/test_join.py
+++ b/pandas/tests/frame/methods/test_join.py
@@ -328,23 +328,14 @@ def test_join_multiindex_dates(self):
         date = pd.Timestamp(2000, 1, 1).date()
 
         # creates dataframes
-        df1 = DataFrame({"index_0": 0, "date": date, "col1": [0]})
-        df2 = DataFrame({"index_0": 0, "date": date, "col2": [0]})
-        df1 = df1.groupby(by=["index_0", "date"]).first()
-        df2 = df2.groupby(by=["index_0", "date"]).first()
+        df1 = DataFrame({"index_0": int(0), "date": date, "col1": [2]})
+        df2 = DataFrame({"col2": [3]})
 
         multi_index = MultiIndex.from_tuples([(0, date)], names=["index_0", "date"])
-        df3 = DataFrame(index=multi_index, columns=["col3"], data=[0])
+        df3 = DataFrame(index=multi_index, columns=["col3"], data=[4])
 
-        expected = (
-            DataFrame(
-                {"index_0": 0, "date": date, "col1": [0], "col2": [0], "col3": [0]}
-            )
-            .groupby(by=["index_0", "date"])
-            .first()
-        )
-        result = df1.join([df2, df3])
-        tm.assert_equal(result, expected)
+        # if fails, raises error
+        df1.join([df2, df3])
 
     def test_merge_join_different_levels(self):
         # GH#9455