Days Between Dates
Find the exact days, weeks, months, and business days between any two dates. Leap years and weekends handled.
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How to Use the Days Between Dates
Select a start date and an end date. The exact difference in days, weeks, months, and years appears instantly.
About This Tool
Counting days between dates by hand is surprisingly error-prone — different month lengths, leap years, and whether to include the start or end date all introduce mistakes. This calculator gives the exact difference between any two dates in multiple units: total days, weeks and days, months and days, and years. It also shows business days (excluding weekends), which is essential for contract deadlines, project timelines, and legal notice periods. Use it for tracking how many days until a vacation, calculating the length of a lease, or determining the exact duration between two historical events. Related: work out exact age in years and days for age calculations, and add or subtract days from a date for date arithmetic.
Frequently Asked Questions
How is the number of days between dates calculated?
The calculator subtracts the start date from the end date to get the exact difference in days, then derives weeks, months, and years from that value. Business days exclude Saturdays and Sundays.
Is my data saved anywhere?
No. All calculations run locally in your browser. Nothing is sent to any server.
Is there a cost or signup requirement to use the Days Between Dates calculator?
No. The Days Between Dates calculator is free to use with no account required. It correctly handles leap years, varying month lengths, and DST transitions, and can include or exclude the end date depending on your use case. Your selected dates never leave your browser — the calculation is pure client-side arithmetic.
Does this count the start and end dates?
By default, the calculator counts from the start date up to but not including the end date. For example, January 1 to January 3 equals 2 days. This matches how most date arithmetic works — if an event starts Monday and ends Wednesday, it spans 2 days.
How are business days calculated?
Business days exclude Saturdays and Sundays. Public holidays are not excluded because they vary by country and jurisdiction. If your deadline requires excluding holidays, subtract them manually from the business day count.
Created by The Toobits Team · Engineering & Editorial
Toobits is built, tested, and maintained by a small independent engineering team. Every tool is written in TypeScript, runs entirely in the browser, and is reviewed against its source formulas before publication.
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