'How to Make Countdown Timer That Reset Everyday

Just want to ask how to make a countdown timer with alert message every 6 hour and its reset every day. I already make one with var countdowndate but its not what I wanted and I already search in the whole internet and I cant understand anything. so basically what I wanted is I want a timer every 00.00 to 08.00 and after 08.00 its gave an alert "expired" or something like that and after 00.00 in the next day the timer starting again. Thank u



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