Hello @mytrinh ,
I found I thing that, When I change Fields
1. _sale_price_dates_from
2. _sale_price_times_from
3. _sale_price_dates_to
4. _sale_price_times_to
It just changes the text in the input but not change the value of the input. So that The time period will not update.
I will attach screenshot below,
https://prnt.sc/qcvohc
When I deactivate Sales Countdown Timer , then those fields are working fine.
Thank you.