diff --git a/.github/workflows/build_preview_pages.yml b/.github/workflows/build_preview_pages.yml
index f2e9a049af..d261a8c5c8 100644
--- a/.github/workflows/build_preview_pages.yml
+++ b/.github/workflows/build_preview_pages.yml
@@ -11,7 +11,8 @@ on:
   pull_request:
 
 jobs:
-  update_pages:
+  # このJobの名前を変更したときは、voicevox/preview-pages側のscripts/collect.tsも変更すること。
+  build_preview_pages:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -22,8 +23,8 @@ jobs:
 
       - name: Build
         run: |
-          npm run storybook:build -- --preview-url ./ --output-dir dist_preview/storybook
-          npm run browser:build -- --base ./ --outDir dist_preview/editor
+          npm run storybook:build -- --output-dir $(pwd)/dist_preview/storybook
+          npm run browser:build -- --base ./ --outDir $(pwd)/dist_preview/editor
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
diff --git a/src/store/utility.ts b/src/store/utility.ts
index 3989a44914..c27bbe290f 100644
--- a/src/store/utility.ts
+++ b/src/store/utility.ts
@@ -155,7 +155,8 @@ const DEFAULT_SONG_AUDIO_FILE_NAME_VARIABLES = {
 export function currentDateString(): string {
   const currentDate = new Date();
   const year = currentDate.getFullYear();
-  const month = currentDate.getMonth().toString().padStart(2, "0");
+  // NOTE: getMonth()は0から始まるので1を足す
+  const month = (currentDate.getMonth() + 1).toString().padStart(2, "0");
   const date = currentDate.getDate().toString().padStart(2, "0");
 
   return `${year}${month}${date}`;