diff --git a/langchain/document_loaders/whatsapp_chat.py b/langchain/document_loaders/whatsapp_chat.py
index 19832e748..d98a16fdb 100644
--- a/langchain/document_loaders/whatsapp_chat.py
+++ b/langchain/document_loaders/whatsapp_chat.py
@@ -29,11 +29,11 @@ class WhatsAppChatLoader(BaseLoader):
         message_line_regex = r"""
             \[?
             (
-                \d{1,2}
+                \d{1,4}
                 [\/.]
                 \d{1,2}
                 [\/.]
-                \d{2,4}
+                \d{1,4}
                 ,\s
                 \d{1,2}
                 :\d{2}
diff --git a/tests/integration_tests/document_loaders/test_whatsapp_chat.py b/tests/integration_tests/document_loaders/test_whatsapp_chat.py
index 52394fd02..671925be6 100644
--- a/tests/integration_tests/document_loaders/test_whatsapp_chat.py
+++ b/tests/integration_tests/document_loaders/test_whatsapp_chat.py
@@ -17,4 +17,5 @@ def test_whatsapp_chat_loader() -> None:
         "User 2 on 1/23/23, 3:19 AM: Bye!\n\n"
         "User 1 on 1/23/23, 3:22_AM: And let me know if anything changes\n\n"
         "~ User name 2 on 1/24/21, 12:41:03 PM: Of course!\n\n"
+        "~ User 2 on 2023/5/4, 16:13:23: See you!\n\n"
     )
diff --git a/tests/integration_tests/examples/whatsapp_chat.txt b/tests/integration_tests/examples/whatsapp_chat.txt
index 785b8b16f..f64cea183 100644
--- a/tests/integration_tests/examples/whatsapp_chat.txt
+++ b/tests/integration_tests/examples/whatsapp_chat.txt
@@ -2,4 +2,5 @@
 [11/8/21, 9:41:32 AM] User name: Message 123
 1/23/23, 3:19 AM - User 2: Bye!
 1/23/23, 3:22_AM - User 1: And let me know if anything changes
-[1/24/21, 12:41:03 PM] ~ User name 2: Of course!
\ No newline at end of file
+[1/24/21, 12:41:03 PM] ~ User name 2: Of course!
+[2023/5/4, 16:13:23] ~ User 2: See you!
\ No newline at end of file