Days counter is not working properly

[RichuEn]

The "Days" section of the counter is not changing since yesterday. I've used %n to calculate the Days left until the next complete month, but it has been showing a static number since yesterday.
https://codepen.io/RichuEn/pen/rNKJzMo

I'm comparing it to this website to check whether it works correctly.
https://www.thecalculatorsite.com/time/date-calculator.php

[AnnaZrust]

I had this same issue. It was always for me happening when the days left should show 8 or more days. I replaced the %d variable for %D and now it works fine.