diff --git a/mark b/mark
index 90da608..0d22a44 100755
--- a/mark
+++ b/mark
@@ -1,3 +1,3 @@
 #!/bin/bash
 
-sed -i "s/&&&BUILDVER&&&/$(date +'%y%m%d%H%M%S')/" src/lib/Sidebar.svelte
+sed -i "s/&&&BUILDVER&&&/$(TZ=Asia/Tokyo date +'%y%m%d_%H%M%S')/" src/lib/Sidebar.svelte