Need help finding...

[Arcaan]

I don't know if anyone can help me. I am looking for a countdown timer that I can just enter an amount of time I want to count down. I have a game I am playing that skills take time to learn and it will tell me say: 2 d 14 hr 43 min 23 sec till the skill is learned. I want a timer that I can just enter that info and it will start counting down instead of me having to calculate what calender day that will be what hour and min during the day and it start counting down to that time. Any idea where I can find a countdown timer that lets you enter the variables vs chosing a calendar day?