Add or subtract days, weeks, months or years from any date to find your target date.
Counting days across months is more error-prone than it should be — different month lengths, leap years, and the off-by-one trap catch people out regularly. This calculator handles it cleanly.
Add or subtract days, weeks, months, or years from any date, or find the exact difference between two dates in days, weeks, and months. Useful for deadlines, contract notice periods, warranty end dates, event planning, or any calculation that involves counting forward or backward on a calendar.
The business days option filters out weekends for anything involving contract terms, payment terms, or workplace timelines that count working days rather than calendar days.
Calendar days count every day including weekends. Business days count Monday-Friday only, excluding public holidays. Contracts, payment terms, and legal notices often specify one or the other — always check which applies.
Enter your start date, select add days, enter 30, and calculate. The result is exactly 30 calendar days later. If the agreement specifies business days, switch to that option.
Yes — you can add any combination of years, months, weeks, and days in a single calculation. Month-length variations and leap years are handled correctly.