Days Between Dates Calculator | Date Difference Calculator UK 2025
Free UK Days Between Dates Calculator. Calculate exact days, weeks, months, working days and UK bank holidays between any two dates.
Last updated: February 2026
Days Between Dates Calculator
Calculate the exact number of days, weeks, months, and working days between any two dates. Perfect for project planning, deadline tracking, and event countdowns.
How to Use the Days Between Dates Calculator
Our calculator makes it easy to find the exact time difference between any two dates:
- Enter the start date using the date picker or type in DD/MM/YYYY format
- Enter the end date - can be in the past or future
- Choose options - include end date or exclude weekends if needed
- Click Calculate to see comprehensive results instantly
Quick Tip
Use the preset buttons to quickly calculate common time periods like "1 Week", "1 Month", or "Until Christmas" from today's date.
UK Bank Holidays 2025
When calculating working days, remember to account for UK bank holidays. Here are the official bank holidays for England and Wales in 2025:
| Holiday | Date | Day |
|---|---|---|
| New Year's Day | 1 January 2025 | Wednesday |
| Good Friday | 18 April 2025 | Friday |
| Easter Monday | 21 April 2025 | Monday |
| Early May Bank Holiday | 5 May 2025 | Monday |
| Spring Bank Holiday | 26 May 2025 | Monday |
| Summer Bank Holiday | 25 August 2025 | Monday |
| Christmas Day | 25 February 2026 | Thursday |
| Boxing Day | 26 February 2026 | Friday |
Regional Differences
Scotland has additional bank holidays on 2 January and St Andrew's Day (30 November). Northern Ireland observes St Patrick's Day (17 March) and the Battle of the Boyne (12 July) as bank holidays.
Common Date Calculations
Quick reference for frequently needed date calculations:
| Period | Days | Working Days (approx) | Common Uses |
|---|---|---|---|
| 1 Week | 7 days | 5 days | Weekly sprints, short deadlines |
| 2 Weeks | 14 days | 10 days | Notice periods, fortnightly pay |
| 1 Month | 28-31 days | 20-23 days | Monthly billing, subscriptions |
| 3 Months | 90-92 days | 63-66 days | Quarterly reviews, tax periods |
| 6 Months | 181-184 days | ~130 days | Probation periods, half-year reviews |
| 1 Year | 365-366 days | ~261 days | Annual leave, contracts, subscriptions |
Understanding UK Working Days
Standard Working Year
In the UK, a standard working year typically contains:
- 365 calendar days (366 in leap years)
- 104 weekend days (52 Saturdays + 52 Sundays)
- 8 bank holidays (England and Wales)
- 253 potential working days
- 28 days minimum annual leave (including bank holidays) for full-time employees
Notice Periods
UK employment law specifies minimum notice periods:
- 1 week - employed for 1 month to 2 years
- 1 week per year - employed for 2-12 years
- 12 weeks - employed for 12+ years
Pro Rata Calculations
Part-time workers' holiday entitlement is calculated pro rata. For example, someone working 3 days per week is entitled to 16.8 days minimum (3/5 of 28 days).
Common Uses for Date Calculations
Project Management
Calculate project timelines, sprint durations, and milestone dates. Understanding working days helps with realistic planning and resource allocation.
HR and Employment
Calculate notice periods, probation end dates, annual leave entitlements, and service anniversaries for employment contracts and policies.
Financial Planning
Determine payment due dates, invoice periods, loan durations, and tax year calculations for business and personal finance.
Legal Deadlines
Many UK legal deadlines are specified in working days (e.g., Employment Tribunal claims must be filed within 3 months minus 1 day). Always verify specific legal requirements.
Personal Events
Plan weddings, holidays, birthdays, and countdowns to special occasions. Great for determining how many days until an important date.
Frequently Asked Questions
Simply enter your start date and end date in the calculator above. Click "Calculate Difference" to instantly see the number of days, weeks, months, hours, and minutes between the dates, along with the count of working days.
Yes, our calculator automatically accounts for leap years. Years divisible by 4 are leap years (except century years not divisible by 400). So 2024 was a leap year with 366 days, while 2025 has 365 days.
Calendar days include all days (weekdays and weekends). Working days (also called business days) typically exclude Saturdays and Sundays. In the UK, working days may also exclude bank holidays depending on the context.
Our calculator shows working days excluding weekends. The UK has 8 permanent bank holidays in England and Wales. For precise calculations involving bank holidays, refer to the official gov.uk bank holiday schedule for your region.
It depends on your use case. If you're counting "how many days until" an event, exclude the end date. If you're counting "how many days from start to end inclusive" (e.g., a holiday spanning multiple days), include it. Use the checkbox to toggle this option.
The approximate months shown use an average month length of 30.44 days (365.25 days / 12 months). For a more precise breakdown, the calculator also shows years, months, and days separately, accounting for varying month lengths.
Yes, you can enter any two dates, whether in the past, present, or future. The calculator will show the absolute difference between them. This is useful for determining ages, how long ago events occurred, or historical date calculations.
The UK tax year runs from 6 April to 5 April the following year (e.g., 6 April 2025 to 5 April 2026). This is 365 days (366 in leap years). HMRC deadlines are often based on this tax year rather than the calendar year.
Detailed Guide: Common Uses for Date Calculations in the UK
Date calculations are used far more widely than most people realise. From personal milestones to legal deadlines and business planning, knowing the exact number of days between two dates is essential in many everyday and professional situations.
Mortgage and Property Calculations
UK mortgages are typically offered on 25-year or 30-year terms, meaning the total number of days (and therefore interest payments) varies depending on the start date and whether any leap years fall within the term. Fixed-rate mortgage deals commonly run for 2, 3, or 5 years before reverting to the lender's standard variable rate (SVR). Knowing exactly how many days remain until your fixed rate expires helps you plan remortgage applications, which typically need to begin 3-6 months before the deal ends. Use our calculator alongside the Mortgage Calculator to plan the complete timeline of your property financing.
Pregnancy Due Date Calculations
Pregnancy due dates are calculated as 280 days (40 weeks) from the first day of the last menstrual period (LMP). Our calculator can help expectant parents determine exactly how many days remain until their estimated due date, how many weeks pregnant they currently are, and plan key milestones such as the 12-week dating scan, 20-week anomaly scan, and maternity/paternity leave start dates. In the UK, eligible employees can take up to 52 weeks of maternity leave, with Statutory Maternity Pay (SMP) paid for up to 39 weeks. The earliest you can start maternity leave is 11 weeks before the due date.
Holiday and Travel Planning
Whether you are counting down to a summer holiday, planning a gap year, or working out how many annual leave days you need to book, date calculations are central to travel planning. UK full-time employees are entitled to a minimum of 28 days paid annual leave per year (including bank holidays), so knowing exactly how many working days a trip covers helps you budget your leave allocation. Our calculator shows both total days and working days, making it easy to see at a glance how many leave days you need to request.
Contract and Legal Deadlines
Many UK legal processes specify deadlines in days rather than weeks or months. Employment Tribunal claims must be filed within three months minus one day of the act complained about. Consumer rights under the Consumer Rights Act 2015 give you 30 days for a short-term right to reject faulty goods. Cooling-off periods for most online purchases are 14 calendar days from delivery. Insurance claims, planning applications, and court filing deadlines all operate on strict day counts. Our calculator helps ensure you never miss a critical deadline by giving you the precise number of calendar and working days remaining.
Age and Milestone Calculations
Calculating exact age in days is useful for a range of purposes: checking eligibility for age-restricted services (e.g., you must be exactly 17 years old to take a UK driving test), determining pension age eligibility (UK State Pension age is currently 66, rising to 67 between 2026-2028), or simply finding out how many days until a birthday or anniversary. Our companion Age Calculator provides this in a dedicated interface, but this date difference tool gives you the raw numbers for any date pair.
Leap Years and How They Affect Date Calculations
Leap years add an extra day (29 February) to the calendar, which directly affects calculations spanning multiple years. Understanding leap year rules ensures your date calculations are always accurate.
How Leap Years Work
The Gregorian calendar, used in the UK and most of the world, follows these rules to determine leap years:
- Divisible by 4: The year is a leap year (e.g., 2024, 2028, 2032)
- Divisible by 100: The year is NOT a leap year (e.g., 1900, 2100)
- Divisible by 400: The year IS a leap year (e.g., 2000, 2400)
This means 2024 was a leap year (366 days), 2025 is not (365 days), and the next leap year is 2028. Our calculator automatically accounts for all leap year rules, including the century exception, ensuring complete accuracy across any date range.
Practical Impact of Leap Years
A leap year adds one extra day to any calculation that spans 29 February. For example, calculating the number of days from 1 January 2024 to 31 December 2024 gives 366 days, not 365. This matters for interest calculations on loans and savings (where daily interest accrual means an extra day of interest in leap years), employment contracts that specify annual hours, and any deadline or duration specified in exact days.
Working Days vs Calendar Days: A UK Guide
The distinction between working days and calendar days is critical in the UK for employment, legal, and business contexts. Using the wrong count can lead to missed deadlines or incorrect calculations.
Calendar Days
Calendar days include every day -- weekdays, weekends, and bank holidays. Most personal deadlines, consumer rights periods, and general countdown calculations use calendar days. When a contract or regulation says "30 days", it almost always means calendar days unless "working days" or "business days" is specifically stated.
Working Days (Business Days)
Working days exclude Saturdays and Sundays. In many UK legal and business contexts, working days also exclude public bank holidays. The exact number of working days in a year varies:
- 2025: 253 working days (365 minus 104 weekend days minus 8 bank holidays in England and Wales)
- 2026: 253 working days (365 minus 104 weekend days minus 8 bank holidays)
Our calculator shows both total days and working days (excluding weekends) in every result. For calculations that also need to exclude UK bank holidays, refer to the bank holiday table above and subtract accordingly, or use our dedicated Working Days Calculator for even more precise results.
UK Bank Holidays 2026 Reference
For planning calculations into 2026, here are the confirmed bank holidays for England and Wales:
- 1 February 2026 -- New Year's Day (Thursday)
- 3 April 2026 -- Good Friday
- 6 April 2026 -- Easter Monday
- 4 May 2026 -- Early May Bank Holiday (Monday)
- 25 May 2026 -- Spring Bank Holiday (Monday)
- 31 August 2026 -- Summer Bank Holiday (Monday)
- 25 December 2026 -- Christmas Day (Friday)
- 28 December 2026 -- Boxing Day (substitute, Monday)
Scotland and Northern Ireland observe additional bank holidays. Check gov.uk/bank-holidays for the official schedule.
Related Calculators
Last updated: February 2026 | Verified with latest UK rates
Pro Tips for Accurate Results
- Double-check your input values before calculating
- Use the correct unit format (metric or imperial)
- For complex calculations, break them into smaller steps
- Bookmark this page for quick future access
Understanding Your Results
Our Days Between Dates provides:
- Instant calculations - Results appear immediately
- Accurate formulas - Based on official UK standards
- Clear explanations - Understand how results are derived
- 2025/26 updated - Using current rates and regulations
Common Questions
Is this calculator free?
Yes, all our calculators are 100% free to use with no registration required.
Are the results accurate?
Our calculators use verified formulas and are regularly updated for accuracy.
Can I use this on mobile?
Yes, all calculators are fully responsive and work on any device.
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