Date Difference & Countdown Calculator
Calculate the number of days, weeks, and months between two dates, or count down to any future event.
Used for Add/subtract mode. Use negative for past.
How to Use
Useful for project deadlines, leave calculations, loan terms, and event planning.
Formula
Days = (End Date − Start Date) ÷ 86,400,000 msFrequently Asked Questions
How many working days are between two dates?
This calculator counts all days. To exclude weekends, multiply total weeks by 5 and add remaining weekdays. A dedicated business days calculator is more accurate.
What is the date 90 days from today?
Use "Add/subtract days" mode, enter today's date, and add 90. This is commonly needed for visa calculations, contract terms, and payment deadlines.
How do I calculate someone's age in days?
Use "Days between two dates" and enter the birthdate as the start and today as the end date.