diff --git a/lib/notion/getPageProperties.js b/lib/notion/getPageProperties.js
index ea3171c3..0ba6a3bd 100644
--- a/lib/notion/getPageProperties.js
+++ b/lib/notion/getPageProperties.js
@@ -157,10 +157,10 @@ function generateCustomizeUrl(postProperties) {
       fullSlug += formatPostCreatedDate.getUTCFullYear()
     } else if (pattern === '%month%' && postProperties?.date?.start_date) {
       const formatPostCreatedDate = new Date(postProperties?.date?.start_date)
-      fullSlug += (formatPostCreatedDate.getUTCMonth() + 1)
+      fullSlug += String(formatPostCreatedDate.getUTCMonth() + 1).padStart(2, 0)
     } else if (pattern === '%day%' && postProperties?.date?.start_date) {
       const formatPostCreatedDate = new Date(postProperties?.date?.start_date)
-      fullSlug += formatPostCreatedDate.getUTCDate()
+      fullSlug += String(formatPostCreatedDate.getUTCDate()).padStart(2, 0)
     } else if (pattern === '%slug%') {
       fullSlug += (postProperties.slug ?? postProperties.id)
     } else if (!pattern.includes('%')) {