diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f3055c7..39c30ef 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -39,7 +39,7 @@ jobs:
 
       # format datetime to 'v2021.6.26'
       - name: Set version number
-        run: echo "{NOW}={$(date +'v%Y.%m.%d')}" >> $GITHUB_OUTPUT
+        run: echo "NOW=$(date +'v%Y.%m.%d')" >> $GITHUB_OUTPUT
         #echo "::set-env name=NOW::$(date +'v%Y.%m.%d')"
         env:
           ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'