Days Between Dates
Count the days, weeks, and months between two dates. e.g. “How many days between two dates?”
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Results update as you type. All calculation happens in your browser.
Methodology
Count the days, weeks, and months between two dates. This tool uses a standard, documented formula and runs entirely on your device.
Last reviewed January 2026 · Runs client-side
Counting the days between two dates
Whether you are counting down to a deadline or measuring how long something lasted, the number of days between two dates is a common and surprisingly fiddly calculation. This tool handles it, including leap years, in one step.
It also expresses the gap in weeks and approximate months, so you can read it in whatever unit fits the situation.
How to use this calculator
- Pick a start date.
- Pick an end date.
- Read the number of days, weeks, and approximate months between them.
What the inputs mean
- Start and end dates
- The order does not matter, the result shows the absolute gap either way.
From 1 January to 1 July 2026 is 181 days, or about 25 weeks and 6 days.
The formula, in plain terms
The gap is the difference between the two dates in days, accounting for varying month lengths and leap years.
Frequently asked questions
Does it count both end dates?
It measures the span between them. To include both the first and last day, add one to the result.
Are weekends included?
Yes. For working days only, use the Business Days calculator instead.
Last reviewed January 2026. This explainer is general information, not professional advice.