Day Counter: Calculate Days and Time Between Dates
Professional Day Counter 2026 — calculate total days, business days, and working days between any two dates. Supports public holiday exclusion for 10 countries with ISO week numbers, shareable URLs, and visual analytics.
Loading Day Counter Calculator...
Others Calculators
Free calculators for age, date differences, working hours, day counting, time durations, and more
Choose a Date Preset or Enter Custom Dates
Use a Quick Preset (Last 30 Days, This Quarter, This Year) for instant date population, or manually click the "Start Date" and "End Date" fields to enter any specific dates — past or future.
Toggle Business Days Only (Optional)
Enable "Business Days Only" to exclude Saturdays and Sundays from the count. This mode is essential for project timelines, payroll periods, and legal notice calculations where only working days count.
Exclude Public Holidays (Optional)
Enable "Exclude Public Holidays" and select your country from 10 supported options. The calculator removes recognised national holidays and lists each one that was excluded so you have a full audit trail.
Click Calculate Days
Press "Calculate Days." Results appear instantly with total days, a human-readable duration (e.g. "1 year, 4 months, 12 days"), weekdays, weekends, business days, ISO week numbers, and visual charts.
Copy or Share Your Results
Use the "Copy" button to copy a formatted results summary to your clipboard, or click "Share" to copy a pre-filled URL. Anyone who opens the link sees the exact same calculation pre-loaded.
Review Excluded Holidays
If you excluded holidays, an amber card lists every holiday removed from the count by name. This transparency is important for legal and compliance use cases where the exclusion list must be documented.
Reset for a New Calculation
Click "Reset" to clear all fields and return all options to their defaults. All URL parameters are also cleared so you start with a completely fresh, unshared state.
The definition of a "business day" is not universal — it varies by jurisdiction, industry, and legal context. Understanding the correct definition for your use case ensures your day count is legally and financially valid.
IRS Definition (United States Federal Tax)
Under IRS regulations, a business day is any day that is not a Saturday, Sunday, or federal legal holiday. When a tax deadline falls on a weekend or legal holiday, it automatically moves to the next business day. This rule applies to filing deadlines, payment due dates, and the calculation of interest and penalties on underpaid taxes.
Federal Reserve Definition (US Banking)
The Federal Reserve defines a banking business day as any day on which the Federal Reserve Banks are open. This governs ACH (Automated Clearing House) transfers, Fedwire settlements, and the calculation of funds availability. ACH transactions submitted after the daily cutoff are processed on the next banking business day, not the next calendar day.
UK Legal Definition (Employment & Commercial Law)
Under UK law, a business day means any day other than a Saturday, Sunday, or public holiday in England, Wales, Scotland, or Northern Ireland (depending on jurisdiction). The Companies Act 2006 and Employment Rights Act 1996 both use this definition for statutory notice periods, filing deadlines, and payment obligations.
ISO 8601 Business Day Standard
ISO 8601 defines the concept of a working week as Monday through Friday (days 1–5 of the week, where Monday = 1). This definition underpins most international business day calculations in software, financial systems, and project management tools. Our calculator follows this standard, treating Saturday (day 6) and Sunday (day 7) as non-working days.
Important: Contract and legal documents often define "business day" explicitly in their terms. Always check the specific definition in your agreement before relying on any calculator for compliance-critical calculations.
In financial markets, the method used to count days between dates directly affects interest calculations, bond pricing, and loan repayments. Different instruments use different day count conventions — and using the wrong one can lead to significant miscalculations.
| Convention | Used For | Formula | Description |
|---|---|---|---|
| Actual/365 (Actual) | UK gilts, Japanese government bonds | Actual days ÷ 365 | Counts the exact number of days and divides by a fixed 365. Does not adjust for leap years. |
| Actual/360 | US Treasury bills, money market instruments, most bank loans | Actual days ÷ 360 | Uses actual day count but a 360-day year. Produces slightly higher yields than Actual/365 because the denominator is smaller. |
| 30/360 (Bond Basis) | US corporate bonds, agency bonds, municipal bonds | Assumes 30 days per month ÷ 360 | Treats every month as having exactly 30 days regardless of the actual calendar. Simplifies coupon accrual calculations. |
| Actual/Actual (ISDA) | US Treasury notes and bonds, most government bonds | Actual days ÷ actual days in year | Divides by 365 in normal years and 366 in leap years. Considered the most accurate for long-term bond calculations. |
Our day counter uses the Actual/Actual method — counting the precise number of calendar days between two dates. For financial calculations requiring a specific convention (e.g. Actual/360 for bank loans), take the actual day count from this tool and apply your convention's denominator manually.
A notice period is the legally required time between giving notice to end employment and the last working day. Calculating it correctly matters — errors can result in unlawful dismissal claims or forfeited pay-in-lieu-of-notice entitlements.
UK Statutory Minimum Notice Periods
Under the Employment Rights Act 1996, UK employees are entitled to a minimum statutory notice period based on length of continuous employment:
| Length of Continuous Employment | Minimum Notice Period |
|---|---|
| Less than 1 month | None (contractual terms apply) |
| 1 month to 2 years | 1 week |
| 2 years | 2 weeks |
| 3 years | 3 weeks |
| 4 years | 4 weeks |
| 5 to 12 years | 1 week per year of service |
| 12+ years | 12 weeks (statutory maximum) |
To calculate your UK notice end date: use this day counter with your notice start date and add the required calendar days (not business days, unless your contract specifies otherwise).
US At-Will Employment & Notice
Most US employment is at-will, meaning no statutory notice period applies unless specified in a written employment contract. The standard industry practice is 2 weeks (10 business days), but this is a professional convention, not a legal requirement in most states.
The following are the 10 official US federal holidays in 2026. When a holiday falls on a Saturday, it is typically observed on the preceding Friday. When it falls on a Sunday, it is observed on the following Monday. Our calculator automatically applies these observed dates for the United States.
| Date | Holiday | Day |
|---|---|---|
| January 1, 2026 | New Year's Day | Thursday |
| January 19, 2026 | Martin Luther King Jr. Day | Monday |
| February 16, 2026 | Presidents' Day | Monday |
| May 25, 2026 | Memorial Day | Monday |
| June 19, 2026 | Juneteenth National Independence Day | Friday |
| July 3, 2026 | Independence Day (observed) | Friday |
| September 7, 2026 | Labor Day | Monday |
| November 11, 2026 | Veterans Day | Wednesday |
| November 26, 2026 | Thanksgiving Day | Thursday |
| December 25, 2026 | Christmas Day | Friday |
There are approximately 252 working days in 2026 in the United States (365 calendar days minus 105 weekend days minus 10 federal holidays, with 2 holidays falling on weekends and observed on adjacent weekdays).
How Days Are Counted
The calculator uses JavaScript's native Date object, which implements the proleptic Gregorian calendar. It correctly handles February 29 in leap years, 30 vs 31-day months, and timezone-neutral UTC comparisons to prevent off-by-one errors that affect calculators that use local timezone arithmetic.
ISO Week Numbers Explained
An ISO week (defined in ISO 8601) runs from Monday to Sunday. Week 1 of a year is the week containing the year's first Thursday. This means January 1 may fall in the last ISO week of the previous year (e.g., January 1, 2023 was in ISO week 52 of 2022). Our calculator displays the ISO week number for both your start and end dates — useful for project scheduling and payroll systems that use week-based references.
The Doomsday Algorithm (How Weekday Calculation Works)
Our calculator uses the Doomsday algorithm to instantly determine the weekday of any date. "Doomsday" dates are a set of dates within each year that always fall on the same weekday — the year's "doomsday." By knowing a year's doomsday, any other date's weekday can be calculated using simple modular arithmetic.
| Month | Doomsday Reference Date |
|---|---|
| January | 1/3 (1/4 in leap years) |
| February | 2/28 (2/29 in leap years) |
| March | 3/14 (Pi Day) |
| April | 4/4 |
| May | 5/9 |
| June | 6/6 |
| July | 7/11 |
| August | 8/8 |
| September | 9/5 |
| October | 10/10 |
| November | 11/7 |
| December | 12/12 |
January and February shift by one day in leap years. Once you know any reference date's weekday, you can calculate nearby dates using modular 7 arithmetic.
Century Anchor Days
Every century has an anchor day — a fixed reference weekday that determines the doomsday for every year in that century. The anchor shifts every 100 years because the Gregorian calendar's 400-year cycle doesn't divide evenly. This means year 2000 has the same anchor day as 1600 and will repeat in 2400.
| Century | Anchor Day |
|---|---|
| 1800s | Friday |
| 1900s | Wednesday |
| 2000s | Tuesday |
| 2100s | Sunday |
| 2200s | Friday |
Weekday Numerical Values
Date calculation algorithms represent weekdays as integers 0–6. Addition and subtraction are then performed using modulo 7 arithmetic — the same principle as a 7-hour clock — to find the resulting day without iterating through every individual date.
| Day | Value | Type |
|---|---|---|
| Sunday | 0 | Weekend |
| Monday | 1 | Weekday |
| Tuesday | 2 | Weekday |
| Wednesday | 3 | Weekday |
| Thursday | 4 | Weekday |
| Friday | 5 | Weekday |
| Saturday | 6 | Weekend |
How many days are there between two dates?
Enter your start and end dates and click Calculate. The tool uses ISO 8601-compliant date arithmetic to give you the exact number of calendar days, weekdays, weekends, weeks, and months between any two dates — accounting for every month's actual length and leap years.
How do I calculate only business days between two dates?
Enable "Business Days Only" before clicking Calculate. The calculator subtracts all Saturdays and Sundays, giving you the precise working day count. Layer on "Exclude Public Holidays" with your country selected for government-holiday-aware calculations.
Can I exclude public holidays from the day count?
Yes. Toggle 'Exclude Public Holidays' and choose from 10 supported countries: US, UK, India, Canada, Australia, Germany, France, Singapore, UAE, and New Zealand. The calculator removes all recognised national holidays and lists each one excluded.
How many business days are left in 2026?
Set your start date to today and end date to December 31, 2026. Enable 'Business Days Only' and click Calculate. The result is the exact number of working days remaining — excluding all Saturdays, Sundays, and optionally federal holidays.
Does the calculator handle leap years correctly?
Yes. The calculator uses JavaScript's native Date object following Gregorian calendar rules. A year is a leap year if divisible by 4, except century years which must be divisible by 400. February automatically has 29 days in leap years — 2028 and 2032 are the next leap years.
Can I count days for dates in the past?
Absolutely. You can set any start and end date — past or future. The calculator computes the absolute difference, so the order you enter them doesn't matter — you always receive a positive count.
Why does my business day count differ from what I expected?
Business day counts vary based on: (1) whether your start/end dates are inclusive or exclusive, (2) which specific public holidays are in scope for your jurisdiction, and (3) local or regional holidays not covered by the national list. Our calculator includes the start date. For jurisdiction-specific accuracy, cross-reference the 'Holidays Excluded' list in the results.
Trust, Transparency & Expert Verification
ISO 8601 Compliant
Date arithmetic follows the ISO 8601 international standard for date and time representation. Reference: ISO 8601 Standard
Privacy First
All calculations run locally in your browser — no date data is transmitted to any server. Reference: MDN Web Security Guidelines
10 Country Holiday Databases
Public holidays sourced from official government calendars for 10 countries. Reference: timeanddate.com
NIST Time Standards
Time and calendar calculations aligned with US national time standards. Reference: NIST Time & Frequency Division
Verified Against IRS, Federal Reserve & ISO 8601 Standards
This Day Counter's business day definitions are cross-referenced against IRS Publication 501, Federal Reserve Regulation CC (Availability of Funds), and ISO 8601 to ensure accuracy for professional tax, legal, and financial use.
Developed & Maintained By: Raviraj Bhosale (Founder, vipcalculator.net)
Methodology: ISO 8601 Gregorian Date Arithmetic + IRS/FRB Business Day Rules
Countries Covered: US, UK, India, Canada, Australia, Germany, France, Singapore, UAE, New Zealand
Last Reviewed: March 2026
Expertise & Trust (Human Verified)
Hello! I’m an SEO expert and web developer, and the founder of vipcalculator.net.My goal is to build reliable, high-performance tools that provide accurate results for daily professional and personal calculations.
Verified by Human Expertise: This website and all of its algorithms are fully human-verified. We strictly follow Google’s Helpful Content guidelines and prioritize user privacy at every level.
You can explore my professional background and previous projects by visiting my LinkedIn Profile. As a developer, I am committed to making your digital tasks simpler, safer, and more efficient through precise tools.