TRUTHY TOOLS

Days Between Dates Calculator

Compare two YYYY-MM-DD dates and calculate day differences using four inclusion rules.

Calendar Difference
Ready
Enter two dates to calculate the difference.
Excluding Both Dates
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Counts only the days between the start and end date.
Including Both Dates
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Counts the start date, end date, and days between.
Including Start Date
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Counts the start date and days before the end date.
Including End Date
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Counts days after the start date and includes the end date.
End date must be on or after the start date. Date math uses UTC midnight to avoid daylight saving time shifts.

About this tool

Date Diff helps developers, schedulers, support teams, and distributed coworkers calculate date differences in days with inclusive and exclusive counting options. Use it during logs, runbooks, release windows, recurring jobs, and timezone-sensitive notes when you need a focused result you can read, copy, or share without opening a heavier application.

Use cases

  • Use Date Diff while working on logs when you need to calculate date differences in days with inclusive and exclusive counting options.
  • Copy Date Diff output into tickets, docs, test notes, spreadsheets, or chat threads so teammates can verify the same result.
  • Keep Date Diff open as a repeatable browser utility for quick checks instead of building a one-off spreadsheet or script.

FAQ

What is Date Diff best used for?

Date Diff is best used when you need to calculate date differences in days with inclusive and exclusive counting options in a fast, copy-friendly browser workflow.

Who benefits most from the Date Diff tool?

It is especially helpful for developers, schedulers, support teams, and distributed coworkers who handle logs, runbooks, release windows, recurring jobs, and timezone-sensitive notes and need clear output without extra setup.

Can I use Date Diff results in documentation or bug reports?

Yes. The output is designed to be readable and easy to paste into issues, docs, QA notes, or team conversations.