diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 33aa2c2..52c43d0 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -60,9 +60,10 @@ jobs:
           echo "IMAGE_TAG=$IMAGE_TAG" >> $GITHUB_ENV
 
           # Tag the image with the date too
-          DATE_TAG=$IMAGE_TAG-$(date --iso-8601=seconds --utc | sed 's/+00:00/Z/')
+          DATE_TAG=${IMAGE_TAG}_$(date -u +"%Y-%m-%dT%H-%M-%SZ")
           echo "The date tag is: $DATE_TAG"
           echo "DATE_TAG=$DATE_TAG" >> $GITHUB_ENV
+
       - name: Build images
         uses: devcontainers/ci@v0.3
         # Options: https://github.com/devcontainers/ci/blob/main/action.yml