Date Difference Calculator
Calculate the number of days, weeks, months and years between two dates, including business days. Free date difference and day counter calculator.
Date Difference
Date Range
Calculated Gap
Instant Local Computation
0
Years
0
Months
0
Days
0
Total Weeks
0
Total Days
0
Hours
0
Minutes
Business Breakdown
Calculation includes leap years and handles inverted date orders automatically.
0
Workdays
0
Weekend Days
Did you know? This gap represents exactly 0.00 Solar Years.
About this tool
Measure the exact span between any two dates — in days, weeks, months, and years, with an option to count business days only. Contract terms, project timelines, notice periods, and tenure all come down to this one calculation, done right with leap years included.
How to Calculate Days Between Dates
- 1
Enter the start and end dates of the span you're measuring.
- 2
Choose total days or business days — the latter skipping weekends for working-time calculations.
- 3
Read the result in every unit at once: total days, weeks, plus the months-and-years breakdown for human-friendly framing.
Why Calculate Date Spans with Wrklyst
- Figured On Your Device
- The calendar arithmetic runs in-browser — contract dates and personal milestones aren't sent anywhere to be counted.
- Precise Across Calendar Quirks
- Leap years and unequal months are exactly where mental math fails; algorithmic counting doesn't.
- Business Days Built In
- Weekday-only counting — the version deadlines actually use — is a toggle, not a separate manual exercise.
Deadline Math Tips
- Deadlines phrased 'within 30 days' — confirm whether day one is the trigger date or the day after; contracts differ.
- Count business days for delivery promises; customers hear calendar days and vendors mean working days.
- For recurring obligations, calculate the next three occurrences now and diary them.
- Visa day-limits count every calendar day including arrival and departure in most jurisdictions — verify yours.
Frequently asked questions
Is the end date included in the count?
The tool measures the span between the dates — the convention used for durations. Whether your context counts inclusively differs: a hotel stay from the 1st to the 3rd is two nights, but a rental 'from the 1st through the 3rd' may bill three days. Know which your contract means, and adjust by one accordingly.
How is 'months between dates' even defined?
Months vary from 28 to 31 days, so month-spans are computed calendar-wise: January 15 to March 15 is exactly two months even though the day count varies by year. That's why results show both — day counts for precision, month/year framing for how humans and contracts speak.
Does business-day counting handle public holidays?
It excludes weekends — the universal rule — while public holidays vary by country, state, and even industry, so they aren't assumed. For deadline-critical calculations, take the business-day figure and subtract the specific holidays in your jurisdiction that fall within the span.
What are the most common uses for this calculation?
Notice periods (does 30 days from today clear the deadline?), contract and lease durations, employee tenure for benefits eligibility, project timelines in working days, interest periods, visa stay limits, and pregnancy or medical timelines. Anywhere a document says 'within N days', this is the arithmetic behind compliance.