diff --git a/web/package.json b/web/package.json
index 5e1f8b7..af022e1 100644
--- a/web/package.json
+++ b/web/package.json
@@ -1,5 +1,5 @@
 {
-  "version": "0.4.70",
+  "version": "0.4.71",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/web/src/themes/07_STRAP/index.ts b/web/src/themes/07_STRAP/index.ts
index 50dba00..453e1bd 100644
--- a/web/src/themes/07_STRAP/index.ts
+++ b/web/src/themes/07_STRAP/index.ts
@@ -106,10 +106,10 @@ const STRAP_FUNC: ThemeFunc = (photo: Photo, input: ThemeOptionInput, store: Sto
       context.fillStyle = SECONDARY_TEXT_COLOR;
       const takenAt = new Date(photo.takenAt);
       context.fillText(
-        `${takenAt.getFullYear()}年${(takenAt.getMonth() + 1).toString().padStart(2, '0')}月${takenAt.getDate().toString().padStart(2, '0')}日 ${takenAt
-          .getHours()
+        `${takenAt.getFullYear()}/${(takenAt.getMonth() + 1).toString().padStart(2, '0')}/${takenAt.getDate().toString().padStart(2, '0')} ${takenAt.getHours().toString().padStart(2, '0')}:${takenAt
+          .getMinutes()
           .toString()
-          .padStart(2, '0')}:${takenAt.getMinutes().toString().padStart(2, '0')}:${takenAt.getSeconds().toString().padStart(2, '0')}`,
+          .padStart(2, '0')}:${takenAt.getSeconds().toString().padStart(2, '0')}`,
         FONT_SIZE,
         canvas.height - PADDING_BOTTOM / 2 + FONT_SIZE / 2
       );
diff --git a/web/src/themes/10_LIGHTROOM/index.ts b/web/src/themes/10_LIGHTROOM/index.ts
index e71cc34..fd49aa2 100644
--- a/web/src/themes/10_LIGHTROOM/index.ts
+++ b/web/src/themes/10_LIGHTROOM/index.ts
@@ -61,7 +61,7 @@ const LIGHTROOM_FUNC: ThemeFunc = (photo: Photo, input: ThemeOptionInput, store:
   if (photo.takenAt) {
     const takenAt = new Date(photo.takenAt);
     context.fillText(
-      `${takenAt.getFullYear()}年${(takenAt.getMonth() + 1).toString().padStart(2, '0')}月${takenAt.getDate().toString().padStart(2, '0')}日 ${takenAt.getHours().toString().padStart(2, '0')}:${takenAt
+      `${takenAt.getFullYear()}/${(takenAt.getMonth() + 1).toString().padStart(2, '0')}/${takenAt.getDate().toString().padStart(2, '0')} ${takenAt.getHours().toString().padStart(2, '0')}:${takenAt
         .getMinutes()
         .toString()
         .padStart(2, '0')}:${takenAt.getSeconds().toString().padStart(2, '0')}`,
diff --git a/web/src/themes/16_SIMPLE/index.ts b/web/src/themes/16_SIMPLE/index.ts
index 1930e14..1bb3954 100644
--- a/web/src/themes/16_SIMPLE/index.ts
+++ b/web/src/themes/16_SIMPLE/index.ts
@@ -57,7 +57,7 @@ const SIMPLE_FUNC: ThemeFunc = (photo: Photo, input: ThemeOptionInput, store: St
     context.font = `300 ${30}px ${FONT_FAMILY}`;
     const takenAt = new Date(photo.takenAt);
     context.fillText(
-      `${takenAt.getFullYear()}年${(takenAt.getMonth() + 1).toString().padStart(2, '0')}月${takenAt.getDate().toString().padStart(2, '0')}日 ${takenAt.getHours().toString().padStart(2, '0')}:${takenAt
+      `${takenAt.getFullYear()}/${(takenAt.getMonth() + 1).toString().padStart(2, '0')}/${takenAt.getDate().toString().padStart(2, '0')} ${takenAt.getHours().toString().padStart(2, '0')}:${takenAt
         .getMinutes()
         .toString()
         .padStart(2, '0')}:${takenAt.getSeconds().toString().padStart(2, '0')}`,