how to extand sale product timer dates autometically to next week?

hi

https://www.mobilegeeks.pk/product/apple-airpods-pro-master-copy/

for example

I have set up the sales timer, but I want to schedule the dates automatically after the end of the sale time.
for example
28th February sale going to end, but I want to automatically schedule the timer for next week
how it be possible

thanks