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No signupAge Calculator
Find your exact age in years, months, and days - plus next birthday countdown.
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Date Calculator
Find the exact difference between two dates - years, months, days.
date-calculator.tool
Pick both dates to see the difference
Uses calendar-accurate math (handles leap years and month-end dates correctly) - runs locally in your browser.
What is a date calculator?
This tool calculates the exact difference between two dates - total days, and a calendar-accurate years/months/days breakdown that correctly handles leap years and month-end edge cases (like the gap between January 31st and March 1st).
How to use this tool
- 1Pick a "From" date and a "To" date (defaults to today).
- 2The total day count and a years/months/days breakdown appear instantly.
- 3Use Swap to flip the two dates, or "Set To = Today" to reset the end date.
Common use cases
Counting how many days until a deadline, event, or trip
Finding out how long ago something happened
Calculating exact project duration between a start and end date
Working out a precise age or anniversary length in years, months, and days
Good to know
Frequently asked questions
Does it handle leap years correctly?
Yes - the calculation is calendar-aware, not a simple day-count division, so leap years (like February 29th) are handled correctly rather than approximated.
What happens with month-end dates, like January 31st?
It's handled the way calendars actually work - a month added to January 31st lands on the last day of February (28th or 29th) rather than overflowing into March, matching how people naturally think about "one month later."
What if I pick the "To" date before the "From" date?
It still works - the tool automatically detects the order and shows which date comes after which, so you don't need to enter them in a specific sequence.
Is my data sent anywhere?
No - every calculation happens locally in your browser.
quick_facts.json
{
"runs_in_browser": true,
"data_sent_to_server": false,
"signup_required": false,
"price": "free",
"category": "Date/Time Tools"
}
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