Free Date Difference Calculator Date Difference Calculator Calculate the exact difference between two dates, or add/subtract time from a date. Date Difference Add / Subtract Start Date 📅 ⇄ End Date 📅 Include end date (add 1 day) Calculate Clear 0 Years 0 Months 0 Weeks 0 Days Total calendar days Total business days Total weeks Total hours Total minutes Total seconds Start day of week End day of week Start Date 📅 Operation + Add − Subtract Years Months Weeks Days Calculate Clear