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Date Difference Calculator: Days Between Two Dates
Tooly · 2026-08-02 · 5 min read
How many days until the deadline? How long since the project started? Date math looks simple until leap years and month lengths get involved. A date difference calculator handles all of it — days, weeks, months, and years between any two dates, instantly. No signup, nothing uploaded.
What a date difference calculator does
- Total days — the exact span between two dates
- Weeks & remaining days — the breakdown for planning
- Months & years — calendar-aware, not just 30-day math
- Leap years handled — no manual corrections needed
Calculate dates free with Tooly
The Tooly Date Difference Calculator keeps it simple:
- Pick a start date and an end date
- See total days, weeks, months, and years instantly
- Works forward or backward between any dates
- Free, no signup, runs in your browser
When you'll use it
- Deadlines — days until launch, delivery, or exam day
- Project planning — sprint lengths and milestone spacing
- Countdowns — events, trips, and special dates
- Business — invoice aging and contract terms (pair with InvoiceForge)
Frequently Asked Questions
Is this date calculator really free? Yes — unlimited calculations, no account, no watermark.
Does it handle leap years? Yes — the calendar math is accurate across leap years and varying month lengths.
Is my data private? Everything runs in your browser — your dates never leave your device.
What else should I check? The Age Calculator works out exact ages, and the Timestamp Converter handles epoch times.
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