diff --git a/justfile b/justfile
index fb46feb..8540df8 100644
--- a/justfile
+++ b/justfile
@@ -1,7 +1,9 @@
 #!/usr/bin/env just --justfile
 
+date := "$(date +'%Y-%m-%d %H:%M')"
+
 # Backup documents
 backup:
   git add -A
-  git commit -m 'backup: $(date +"%Y-%m-%d")'
+  git commit -m "backup: {{date}}"
   git push