From 0dda73be6724cae67fce2140d950ae93fca9cde4 Mon Sep 17 00:00:00 2001
From: Santosh Passoubady <61618641+ssantoshp@users.noreply.github.com>
Date: Mon, 7 Aug 2023 18:47:28 -0400
Subject: [PATCH] Update main.py

---
 src/empyrial/main.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/empyrial/main.py b/src/empyrial/main.py
index ec70841e..e76dc1cd 100644
--- a/src/empyrial/main.py
+++ b/src/empyrial/main.py
@@ -764,7 +764,10 @@ def valid_range(start_date, end_date, rebalance) -> tuple:
         return start_date, rebalance[-1]
     
     # make the end date to a datetime
-    end_date = dt.datetime.strptime(end_date, "%Y-%m-%d")
+    try:
+        end_date = dt.datetime.strptime(end_date, "%Y-%m-%d")
+    except TypeError:
+        pass
 
 
     # gets the number of days