Easily calculate how many weeks and days there are between two dates with speed and accuracy.
Enter two dates to calculate how many weeks and days are between them.
Date selection
The count considers the end date as exclusive (not included).
Result
"End day" must be the same as or later than "Start day".
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week(s)
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day(s)
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Current week
What week of the year are we in?
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Weeks remaining this year: —
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The week counter accurately calculates how many weeks and days exist between
two dates. The count uses an exclusive end date (the last day is not included), ensuring consistency
in schedules, studies, deadlines, and reports.
In addition to interval calculation, the page shows the current ISO week (ISO 8601 standard), with the
week number, Monday to Sunday range, and weeks remaining in the year.
Everything is processed locally in your browser and requires no registration.
How to use (step-by-step)
Choose the dates: select a Start day and End day. Use the Today buttons to fill them in quickly.
View the result: the app displays weeks + days (with an exclusive end date) and a text summary of the interval.
Share or reset: click Share to send/copy the result or Reset to start over.
Application Features (highlights)
Weeks + days between dates: a direct and objective result for planning.
Exclusive end date: a clear and predictable rule (e.g., 03/01 → 03/08 = 7 days = 1 week).
ISO Week Panel: shows the week of the year, the Mon–Sun range, and remaining weeks.
"Today" shortcuts: fill in date fields with one click.
Share / Reset: a quick workflow to disseminate results and restart the calculation.
Privacy by default: everything is processed locally; no data is sent to servers.
Accessible and responsive: easy to read on mobile/desktop; messages via aria-live.
Understanding the outputs and metrics
Weeks: total number of full weeks in the interval.
Days: remaining days after dividing the total by 7.
Text summary: an explanatory line with dates and total days (exclusive end date).
Current ISO week: week number according to the ISO 8601 standard.
Week range: dates from Monday to Sunday for the displayed ISO week.
Weeks remaining in the year: count until the last ISO week of the current year.
How calculations are made
Exclusive end date: difference in days = floor((end − start) / 24h); weeks = floor(days/7); days = days % 7.
ISO Weeks (ISO 8601): weeks start on Monday; week 1 is the one containing the first Thursday of the year (some years have 53 weeks).
Timezone/DST: by using dates (YYYY-MM-DD), the calculation considers full days, minimizing timezone/daylight saving time effects.
Best practices
Define the rule first: confirm with your team that the count is exclusive of the final day.
Align with ISO: for weekly reports, prefer intervals starting on a Monday.
Document the criteria: when sharing, state that the count was exclusive and the ISO standard was used.
Common errors to avoid
Expecting inclusion of the final day: by default, it is not included; add +1 day to the interval if you need to include it.
Confusing ISO week with "local calendar" weeks: ISO weeks start on Monday and can go up to 53 weeks.
Inverting the dates: an "End day" earlier than the "Start day" invalidates the calculation.
When to adjust your calculation?
Adjust the interval if you need to include the final day (add +1 day) or when you need to
strictly align with ISO (start on a Monday). For consistent comparisons, maintain the same rule across periods.
Frequently Asked Questions (FAQ)
Is the end date included? No. The rule is exclusive. To include it, add +1 day to the interval.
What is an ISO week? ISO 8601 standard: weeks from Monday to Sunday; week 1 contains the first Thursday of the year.
Does timezone affect the result? With dates (YYYY-MM-DD), the calculation uses whole days, minimizing timezone/DST effects.
Can I share the result? Yes. Use the Share button (Web Share API/clipboard).
Is my data sent anywhere? No. Everything is processed locally in your browser.
Summary
The week counter delivers a clear calculation of weeks + days between dates, following an
exclusive end date rule and displaying the current ISO week—simple, consistent, and private.
Note: educational content; does not substitute for legal, accounting, or professional advice. Adapt practices to your context and local rules.