i need help with my datapack

Hi guys I had this datapack made, which adds a timer to Minecraft. There are several ways to increase or decrease this timer. Now I was trying to add the fact that if a certain mob, in this case a zombie does damage to me, the timer decreases by 5 seconds. But it doesn't work, I created an advancement with the Entity Hut Player trigger and used the zombie ma. When it hurts me, time doesn't drop