diff --git a/.gitea/workflows/generate-iso.yaml b/.gitea/workflows/generate-iso.yaml
index ddca1c8..1c4366b 100644
--- a/.gitea/workflows/generate-iso.yaml
+++ b/.gitea/workflows/generate-iso.yaml
@@ -143,7 +143,7 @@ jobs:
         shell: bash
         run: |
           chmod 0755 ciss_live_builder.sh
-          timestamp=$(date -u +"%Y_%m_%d_%H_%M_Z")
+          timestamp=$(date -u +"%Y_%m_%dT%H_%M_%SZ")
           ### Change "--autobuild=" to the specific kernel version you need: 6.12.22+bpo-amd64.
           ./ciss_live_builder.sh \
             --autobuild=6.12.22+bpo-amd64 \