--- a/config.m4
+++ b/config.m4
@@ -1307,7 +1307,7 @@

     PHP_REQUIRE_CXX()

-    CXXFLAGS="$CXXFLAGS -Wall -Wno-unused-function -Wno-deprecated -Wno-deprecated-declarations"
+    CXXFLAGS="$CXXFLAGS -Wall -Wno-date-time -Wno-unused-function -Wno-deprecated -Wno-deprecated-declarations"

     if test "$SW_OS" = "CYGWIN" || test "$SW_OS" = "MINGW"; then
         CXXFLAGS="$CXXFLAGS -std=gnu++14"