Q1: How do I add or subtract days from a date?
Enter your starting date, choose "Add Days" or "Subtract Days", enter the number of days, and click Calculate. The calculator handles month and year boundaries automatically. For example, adding 10 days to January 25 will correctly give you February 4.
Q2: Does the calculator handle month and year transitions?
Yes, the calculator automatically handles transitions between months and years. Adding days that cross month boundaries (e.g., Jan 28 + 5 days = Feb 2) or year boundaries (e.g., Dec 30 + 3 days = Jan 2) is calculated correctly, including leap years.
Q3: Can I subtract more days than the date allows?
Yes, you can subtract any number of days. The calculator will correctly go back to previous months or years. For example, subtracting 40 days from March 1 will correctly calculate a date in January of the same or previous year.
Q4: How are leap years handled?
The calculator automatically accounts for leap years. February 29th is handled correctly, and calculations that cross leap year boundaries (February 28/29) work accurately. The JavaScript Date object handles leap years automatically.
Q5: What format is the result displayed in?
The result is displayed in your browser's locale date format (typically MM/DD/YYYY in US, DD/MM/YYYY in many other regions). The format depends on your device's regional settings. The date value is accurate regardless of display format.
Q6: Can I add or subtract weeks or months?
This calculator works with days only. To add weeks, multiply by 7 (e.g., 2 weeks = 14 days). To add months approximately, multiply by 30 (e.g., 3 months ≈ 90 days). For exact month calculations, use a date calculator that handles months specifically.