Calculate the exact difference between two dates in days, weeks, months, and years. Or add/subtract days from a date to find a past or future date. Handles leap years correctly.
Open Date Calculator → free, no sign-inHow many days until the project deadline? How long ago was that meeting? How old will someone be on a future date? The Date Calculator handles all of these: calculate the exact difference between two dates in days, weeks, months, and years, or add/subtract a precise number of days from a starting date to find a future or past date. Useful in ways that come up more often than you'd expect.
Project managers calculating delivery timelines, HR teams working out notice periods or probationary end dates, financial professionals computing settlement dates, or anyone who needs precise date arithmetic beyond what a mental calendar provides.
No tutorials. No learning curve. Open it and get started.
No server uploads. Results are shown in multiple units simultaneously — days, weeks, months, and years — so you can use whichever is most meaningful.
Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.
One job, done well. Date Calculator was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.
Does it account for leap years?
Yes — leap years are handled automatically.
Can I calculate how many days until a future date?
Yes — enter today and the future date to get the day count.
What is the furthest date supported?
Dates over a wide historical and future range are supported.
Are business days supported?
This tool calculates calendar days. Business day calculations would exclude weekends and holidays.
Can I use this to calculate someone's age?
Yes — enter the birthday and today's date to get the age in years, months, and days.
Free. Instant. No sign-in. Open it and get the job done.
Open Date Calculator on Doathingy.com →