Date Difference Calculator

The Date Difference Calculator works out the exact gap between any two dates in days, weeks, months and years, and separately counts working days excluding weekends and UK bank holidays. It is useful for everything from project deadlines and notice periods to working out how many days remain until a holiday, a baby is due, or a tax return must be filed. Working-day calculations are particularly important in the UK because the four nations have different sets of bank holidays. England and Wales have 8 bank holidays a year (New Year Day, Good Friday, Easter Monday, Early May, Spring late May, Summer late August, Christmas Day, Boxing Day). Scotland has 9, swapping Easter Monday for 2 January and adding St Andrew Day on 30 November. Northern Ireland has 10, keeping the England & Wales set plus St Patrick Day (17 March) and the Battle of the Boyne (12 July). The calculator lets you pick which set applies. The UK tax system creates several date-difference scenarios where accuracy matters. The personal tax year runs 6 April to 5 April, totalling 365 days (or 366 in a leap year). For Capital Gains Tax on residential property, completion to HMRC payment must happen within 60 days (raised from 30 days in 2020). Self Assessment online filing deadline is 31 January following the tax year end. Stamp Duty Land Tax (SDLT) refunds on the 3% additional property surcharge can be claimed when the previous main residence is sold within 3 years — knowing the exact deadline is critical to avoid losing the refund. The calculator counts these intervals precisely, including leap years and end-of-month edge cases. For HR and employment, the calculator handles notice periods (calendar versus working days), the statutory minimum notice from employers (1 week per complete year of service, capped at 12 weeks), holiday accrual, probation period end dates, and length-of-service milestones that affect redundancy pay or long-service awards. For personal use, it counts down to weddings, holidays, retirement, exam dates, or simply how many days you have been married or known your partner.