diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -6914,7 +6914,10 @@
 def _SLASH_Zm : CLIgnoredJoined<"Zm">;
 def _SLASH_Zo : CLIgnoredFlag<"Zo">;
 def _SLASH_Zo_ : CLIgnoredFlag<"Zo-">;
-
+def _SLASH_d1nodatetime : CLIgnoredFlag<"d1nodatetime">,
+  HelpText<"d1nodatetime">;
+def _SLASH_d1import_no_registry : CLIgnoredFlag<"d1import_no_registry">,
+  HelpText<"d1import_no_registry">;
 
 // Unsupported: