diff --git a/lib/java/com/google/android/material/datepicker/DateFormatTextWatcher.java b/lib/java/com/google/android/material/datepicker/DateFormatTextWatcher.java
index 19cbdf96edc..c64833fe8cf 100644
--- a/lib/java/com/google/android/material/datepicker/DateFormatTextWatcher.java
+++ b/lib/java/com/google/android/material/datepicker/DateFormatTextWatcher.java
@@ -123,7 +123,7 @@ public void afterTextChanged(@NonNull Editable s) {
     }
 
     char nextCharHint = formatHint.charAt(s.length());
-    if (!Character.isDigit(nextCharHint)) {
+    if (!Character.isLetterOrDigit(nextCharHint)) {
       s.append(nextCharHint);
     }
   }