Subtracting days from dates is essential for calculating deadlines, creating date ranges, and implementing scheduling features in web applications. As the creator of CoreUI, a widely used open-source UI library, I’ve implemented date subtraction in numerous dashboard components, reports, and calendar widgets. From my expertise, the most reliable solution is to use the setDate() method combined with getDate() to modify the date value. This approach automatically handles month boundaries, leap years, and other calendar complexities.