diff --git a/scripts/convert.sh b/scripts/convert.sh
index c8e92910..55d4e6b7 100755
--- a/scripts/convert.sh
+++ b/scripts/convert.sh
@@ -63,6 +63,12 @@ REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
 OUT_DIR="$REPO_ROOT/integrations"
 TODAY="$(date +%Y-%m-%d)"
 
+# Static date stamped into Antigravity skill frontmatter. Deliberately fixed (NOT
+# the convert-run date): a per-run TODAY made every regeneration produce different
+# bytes, which churns the gitignored output and breaks byte-reproducible rendering
+# downstream. Matches the documented example in integrations/antigravity/README.md.
+ANTIGRAVITY_DATE_ADDED="2026-03-08"
+
 # Shared helpers (get_field, get_body, slugify, ...)
 # shellcheck source=lib.sh
 . "$SCRIPT_DIR/lib.sh"
@@ -125,7 +131,7 @@ name: ${slug}
 description: ${description}
 risk: low
 source: community
-date_added: '${TODAY}'
+date_added: '${ANTIGRAVITY_DATE_ADDED}'
 ---
 ${body}
 HEREDOC