diff --git a/extensions/resteasy-jsonb/deployment/src/main/java/io/quarkus/resteasy/jsonb/deployment/serializers/AbstractDatetimeSerializerGenerator.java b/extensions/resteasy-jsonb/deployment/src/main/java/io/quarkus/resteasy/jsonb/deployment/serializers/AbstractDatetimeSerializerGenerator.java
index d8c2ec9209e81..810e27a386df7 100644
--- a/extensions/resteasy-jsonb/deployment/src/main/java/io/quarkus/resteasy/jsonb/deployment/serializers/AbstractDatetimeSerializerGenerator.java
+++ b/extensions/resteasy-jsonb/deployment/src/main/java/io/quarkus/resteasy/jsonb/deployment/serializers/AbstractDatetimeSerializerGenerator.java
@@ -28,6 +28,9 @@ protected void generateNotNull(GenerateContext context) {
                 locale = localeValue.asString();
             }
         }
+        if (format.equals(JsonbDateFormat.DEFAULT_FORMAT) && context.getGlobalConfig().getDateFormat().isPresent()) {
+            format = context.getGlobalConfig().getDateFormat().get();
+        }
 
         doGenerate(context, format, locale);
     }