diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 4b4c78e..2459dcd 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -24,7 +24,7 @@ jobs:
         name: Set environment variables
         run: |
           echo "BRANCH=${GITHUB_REF#refs/heads/}" >> $GITHUB_ENV
-          echo "NOW=$(date +'%Y-%m-%dT%H:%M:%S')" >> $GITHUB_ENV
+          echo "NOW=$(date -R)" >> $GITHUB_ENV # date -Iseconds; date +'%Y-%m-%dT%H:%M:%S'
       -
         name: Set up QEMU
         uses: docker/setup-qemu-action@v2