Date Difference Calculator
Count days, weeks and business days between two dates.
Difference
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Processing and privacy
Processing varies by tool. Check the instructions for local processing, server requests, external services and any file or request limits before entering sensitive information.
Read the privacy policyHow this calculation works
Understand the method, inputs and limits behind your result.
- Formula
- Difference = ending date − starting date. Calendar years and months differ from fixed-day totals; inclusive counting adds the selected endpoint when enabled.
- Variables
- Start and end = dates being compared
- Inclusive option = whether to include the ending day
- Units
- Calendar dates; duration in displayed days, weeks, months or years.
- Example
- From January 1 to January 2 is one day of elapsed date difference; including the end date adds one day to the count.
- Assumptions
- The result follows the selected options and supplied inputs. Displayed values may be rounded; check input precision before using the result.
- Source
- ToolzHive calculation guide and calculator implementation. External reference verification is pending.
- Last reviewed
- Review date not yet recorded.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Date Difference Calculator
Compare two dates in days, weeks and other displayed calendar totals.
- 1 Enter Start date and End date.
- 2 Choose Include the end date when both endpoints should be counted, or use Swap dates.
- 3 Read Difference, Business days and Weekend days.
Example and practical tips
From January 1 to January 2 is one day of elapsed date difference; including the end date adds one day to the count.
Frequently asked questions
Does the business-day total exclude public holidays?
No. It distinguishes weekdays and weekends rather than using a country-specific holiday calendar.
Are hour totals exact across daylight-saving changes?
They are derived from date arithmetic, not a zone-specific elapsed-time interval. Use a suitable time-zone calculation for exact instants.
Practical guides
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How to Use Date Difference Calculator
Calculate the difference between two dates in days, weeks and more. Find how long until or since any date. Free date difference calculator.
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