fix negative countdown

main.js

@@ -10,10 +10,10 @@ const update_countdown = () => {
     const diff = target - now;
 
     const timeleft = {}; 
-    timeleft.days = Math.floor(diff/day);
-    timeleft.hours = Math.floor(diff%day/hour);
-    timeleft.minutes = Math.floor(diff%day%hour/minute);
-    timeleft.seconds = Math.floor(diff%day%hour%minute/second);
+    timeleft.days = Math.trunc(diff/day);
+    timeleft.hours = Math.trunc(diff%day/hour);
+    timeleft.minutes = Math.trunc(diff%day%hour/minute);
+    timeleft.seconds = Math.trunc(diff%day%hour%minute/second);
 
     Object.keys(timeleft).forEach((unit) => {
         // retrieve value, cast it to string and optionally pad it with a leading 0