diff --git a/dbms/src/Common/MyTime.cpp b/dbms/src/Common/MyTime.cpp
index b249d2db136..d7ec5ec7a68 100644
--- a/dbms/src/Common/MyTime.cpp
+++ b/dbms/src/Common/MyTime.cpp
@@ -53,7 +53,8 @@ bool isValidSeperator(char c, int previous_parts)
     if (isPunctuation(c))
         return true;
 
-    return previous_parts == 2 && (c == ' ' || c == 'T');
+    // for https://github.com/pingcap/tics/issues/4036
+    return previous_parts == 2 && (c == 'T' || isWhitespaceASCII(c));
 }
 
 std::vector<String> parseDateFormat(String format)