From dcd4d12c0ab55aea50fc93f4de390a815d4ff6f5 Mon Sep 17 00:00:00 2001
From: Joseph Bryant <jb@dreamcountry.org>
Date: Sun, 18 Aug 2024 21:50:41 +0100
Subject: [PATCH] avoid delta overflow in countdown draw

---
 movement/watch_faces/complication/countdown_face.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/movement/watch_faces/complication/countdown_face.c b/movement/watch_faces/complication/countdown_face.c
index be04040..6ae3d93 100644
--- a/movement/watch_faces/complication/countdown_face.c
+++ b/movement/watch_faces/complication/countdown_face.c
@@ -87,7 +87,10 @@ static void draw(countdown_state_t *state, uint8_t subsecond) {
 
     switch (state->mode) {
         case cd_running:
-            delta = state->target_ts - state->now_ts;
+            if (state->target_ts <= state->now_ts)
+                delta = 0;
+            else
+                delta = state->target_ts - state->now_ts;
             result = div(delta, 60);
             state->seconds = result.rem;
             result = div(result.quot, 60);