FreeKit is a collection of free online tools for developers, SEO professionals, designers, students, content creators, and everyday users.

Are all tools completely free?

Yes. Every tool on FreeKit is free to use without subscriptions or hidden charges.

Do I need to create an account?

No. You can use all tools instantly without creating an account.

No. Most tools process data locally in your browser, and we do not permanently store your inputs.

Can I use FreeKit on mobile devices?

Yes. Every tool is fully responsive and works on smartphones, tablets, laptops, and desktop computers.

How often are new tools added?

We regularly add new tools and improve existing ones based on user feedback and industry needs.

Which browsers are supported?

FreeKit supports all modern browsers, including Chrome, Edge, Firefox, Safari, and other Chromium-based browsers.

Can I share these tools with others?

Absolutely. You are welcome to share FreeKit with friends, colleagues, students, and your team.

What are business days and how are they calculated?

Business days (also called working days) are the days of the week that are typically used for official or commercial activities — Monday through Friday, excluding Saturday and Sunday. Our calculator counts each weekday between your start and end dates. Public holidays are not excluded because they vary by country, region, and year. If you need to account for specific holidays, manually subtract them from the business days result.

How does the calculator handle leap years?

The calculator uses JavaScript's native Date API, which automatically accounts for leap years. A year is a leap year if it is divisible by 4, except for century years (like 1900 or 2100) which must also be divisible by 400 (so 2000 is a leap year). This means February 29 is correctly included in all date range calculations, and months following February in a leap year have the correct offset.

Does the calculator include or exclude the start and end dates?

By default, the calculator counts the difference between two dates exclusive of the start date — meaning if you select January 1 and January 3, the result is 2 days (January 2 and January 3). This is consistent with standard date arithmetic. If you want to include the start date in your count (e.g., for counting the total number of days an event spans), simply add 1 to the total days result.

What counting methods does the calculator use?

The calculator provides multiple views of the same date difference. Total days is the exact count of 24-hour periods between the dates. Weeks converts total days into full weeks and remaining days. Months and days uses a calendar-aware approach that respects varying month lengths (28–31 days). Years, months, and days provides the most human-readable breakdown, similar to how people describe age or tenure.

Can I calculate the difference between historical dates?

Yes. The calculator supports dates from January 1, 1970 through the year 2100 in the date picker. For calculations involving dates before 1970, note that JavaScript's Date object may have limited precision on some browsers. For most practical use cases — project timelines, event planning, and deadline tracking — the supported range covers virtually every scenario.

How can I use this tool for project management?

This calculator is ideal for project planning. Set your project start date and deadline to see the total working days available. Use the business days count (excluding weekends) to plan task assignments and milestones. You can also use the quick presets (30 days, 90 days, 1 year) to rapidly check timeframes. For example, if you have a 90-day sprint, you'll know exactly how many business days your team has to deliver.

Does the calculator account for time zones?

The calculator uses your browser's local time zone for date interpretation. When you select a date, the date picker uses your device's current time zone. Since the calculations are based on whole calendar days (not hours or minutes), time zone differences generally do not affect the result unless your date range crosses a daylight saving time boundary, in which case the day count remains correct because DST shifts are within a single calendar day.

What are ISO week numbers and does this tool support them?

ISO 8601 week numbers assign each week of the year a number from 1 to 52 (or 53 in some years). A week starts on Monday and ends on Sunday. While this calculator does not display ISO week numbers directly, you can use the total weeks result as a close approximation. For precise ISO week numbers, you would need to add the week number of the start date and count forward using the full weeks result.

What is the difference between fiscal year and calendar year calculations?

A calendar year runs from January 1 to December 31, while a fiscal year is a 12-month accounting period that may start on any date (e.g., April 1 to March 31 in many countries). This calculator always uses calendar dates. If you need fiscal year calculations, you can still use this tool by selecting the fiscal year start and end dates — just pick the actual dates that correspond to your fiscal period boundaries.

How does the calculator validate the dates I enter?

The calculator uses native HTML5 date inputs which automatically enforce valid date ranges (e.g., you cannot enter February 30). Additionally, the calculator checks that the start date is not after the end date and displays a clear error message if so. Both dates must be within the supported range of the browser's date picker. If you encounter unexpected results, verify that both dates are entered correctly in YYYY-MM-DD format.

Days Between Dates

Calculate the number of days between two dates.

BeginnerCalculatorsFreev1.0.0Updated Jul 22, 2025

Calculate Days Between Dates

Select two dates to find the exact difference in days, weeks, months, and years

Start Date

End Date

Business Days Mode— Highlight working days (Mon–Fri) in results

How to Calculate Days Between Two Dates

Finding the number of days between two dates is fast and straightforward:

Enter the start date — Use the date picker to select the beginning date or type it in YYYY-MM-DD format.
Enter the end date — Select the target date, or click “End: Today” to quickly use today's date.
Toggle Business Days Mode — Enable this switch to highlight working days (Monday through Friday) in the results, useful for project planning.
Click “Calculate Difference” — Instantly view results in days, weeks, months, years, business days, and a visual weekday/weekend breakdown.

Features

Multiple breakdown formats: total days, weeks + days, months + days, years + months + days
Business days calculation (Monday–Friday) with weekend day count
Visual breakdown bar showing weekday vs weekend percentage
Quick presets: 30 days, 90 days, and 1 year from today
"End: Today" button for instant current-date calculations
Swap button to quickly reverse start and end dates
Total hours, minutes, and business hours derived from the day count
Summary badges for at-a-glance approximate conversions
Calendar-aware month and year calculations respecting varying month lengths
100% browser-based — no data sent to any server

Understanding Date Differences

Inclusive vs. Exclusive Counting

By default, the calculator counts the difference exclusive of the start date. If you select January 1 and January 3, the result is 2 days. To include the start date in your count (e.g., for counting total event days), add 1 to the total days result.

Business Days vs. Calendar Days

Business days exclude Saturdays and Sundays, which is the standard for most countries. However, public holidays are not automatically excluded because they vary by region. Manually subtract known holidays from the business days result for precise work-day counts.

Leap Year Impact

Leap years add an extra day (February 29) to the calendar, affecting date differences that span across February. The calculator automatically handles this — if your date range crosses a leap year February, the extra day is included in the total count.

Calendar vs. Fixed-Unit Breakdown

The “Months + Days” result is calendar-aware, meaning each month is counted by its actual length (28–31 days). The “Weeks + Days” result uses fixed 7-day weeks. These approaches can give different views of the same date span.

Common Use Cases

Project Deadlines

Count the remaining business days before a project deadline to allocate resources effectively.

Event Countdowns

Calculate days until a wedding, vacation, conference, or birthday celebration.

Contract Duration

Determine the exact length of a lease, subscription, or employment contract in days and months.

Age of an Item

Find out how many days a product has been in use, how long since a purchase, or the age of equipment.

Sprint Planning

Use the 30-day or 90-day preset to quickly see available working days for Agile sprint cycles.

Financial Calculations

Calculate day-count for interest accrual, payment schedules, or invoice aging reports.

Travel Planning

Count total days and weekdays for business trips or vacation planning.

Fitness Goals

Track the number of days since you started a workout program or diet plan.

Tips for Using the Days Calculator

Use the "End: Today" button to quickly set the end date to the current day.
Click the swap button between the two date fields to instantly reverse start and end dates.
Enable Business Days Mode when planning work schedules — the tool will highlight Mon–Fri counts.
The 30 days, 90 days, and 1 year presets start from today and auto-fill both date fields.
For event spans (e.g., a 3-day conference from Friday to Sunday), add 1 to the total days result.
The visual breakdown bar shows the weekday-to-weekend ratio at a glance — useful for staffing plans.
Check the "Business Hours" card to estimate total work hours (based on 8-hour workdays, excluding weekends).
Need to convert between time zones? Try our Time Zone Converter.
Want to find your exact age in multiple units? Use our Age Calculator.
Looking for percentage-based calculations? Our Percentage Calculator has you covered.

Date Formats Around the World

ISO 8601 (YYYY-MM-DD)

The international standard format used by this calculator. Dates are written with the year first, then month, then day. This format eliminates ambiguity — unlike MM/DD/YYYY or DD/MM/YYYY, there is no confusion between month and day.

US Format (MM/DD/YYYY)

Common in the United States, this format places the month before the day. For example, January 15, 2025 is written as 01/15/2025. This can be confused with the DD/MM format when the day value is 12 or less.

European Format (DD/MM/YYYY)

Used in most of Europe, Latin America, and Australia. January 15, 2025 is written as 15/01/2025. This format also appears ambiguous when the day is 12 or less without context, which is why ISO 8601 is preferred for international communication.

Why ISO 8601 Matters

Using YYYY-MM-DD ensures dates sort correctly as strings (e.g., in filenames or spreadsheets) and are unambiguous across all regions. Our calculator uses this format internally for precise and reliable date arithmetic in every timezone.

Frequently Asked Questions

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How to Calculate Days Between Two Dates

Finding the number of days between two dates is fast and straightforward:

Enter the start date — Use the date picker to select the beginning date or type it in YYYY-MM-DD format.

Enter the end date — Select the target date, or click “End: Today” to quickly use today's date.

Toggle Business Days Mode — Enable this switch to highlight working days (Monday through Friday) in the results, useful for project planning.

Click “Calculate Difference” — Instantly view results in days, weeks, months, years, business days, and a visual weekday/weekend breakdown.

Features

Multiple breakdown formats: total days, weeks + days, months + days, years + months + days

Business days calculation (Monday–Friday) with weekend day count

Visual breakdown bar showing weekday vs weekend percentage

Quick presets: 30 days, 90 days, and 1 year from today

"End: Today" button for instant current-date calculations

Swap button to quickly reverse start and end dates

Total hours, minutes, and business hours derived from the day count

Summary badges for at-a-glance approximate conversions

Calendar-aware month and year calculations respecting varying month lengths

100% browser-based — no data sent to any server

Understanding Date Differences

Inclusive vs. Exclusive Counting

Business Days vs. Calendar Days

Leap Year Impact

Calendar vs. Fixed-Unit Breakdown

Common Use Cases

Project Deadlines

Count the remaining business days before a project deadline to allocate resources effectively.

Event Countdowns

Calculate days until a wedding, vacation, conference, or birthday celebration.

Contract Duration

Determine the exact length of a lease, subscription, or employment contract in days and months.

Age of an Item

Find out how many days a product has been in use, how long since a purchase, or the age of equipment.

Sprint Planning

Use the 30-day or 90-day preset to quickly see available working days for Agile sprint cycles.

Financial Calculations

Calculate day-count for interest accrual, payment schedules, or invoice aging reports.

Travel Planning

Count total days and weekdays for business trips or vacation planning.

Fitness Goals

Track the number of days since you started a workout program or diet plan.

Tips for Using the Days Calculator

Use the "End: Today" button to quickly set the end date to the current day.

Click the swap button between the two date fields to instantly reverse start and end dates.

Enable Business Days Mode when planning work schedules — the tool will highlight Mon–Fri counts.

The 30 days, 90 days, and 1 year presets start from today and auto-fill both date fields.

For event spans (e.g., a 3-day conference from Friday to Sunday), add 1 to the total days result.

The visual breakdown bar shows the weekday-to-weekend ratio at a glance — useful for staffing plans.

Check the "Business Hours" card to estimate total work hours (based on 8-hour workdays, excluding weekends).

Need to convert between time zones? Try our Time Zone Converter.

Want to find your exact age in multiple units? Use our Age Calculator.

Looking for percentage-based calculations? Our Percentage Calculator has you covered.