⏰ Time Calculators UK
Time and date calculators for working out durations, differences and deadlines quickly and accurately — from age in years and days to the gap between two dates.
Calculating time spans by hand is a common source of off-by-one errors — leap years, varying month lengths and time zones all complicate what looks like simple subtraction. Whether you're working out someone's exact age, the number of days until a deadline, or the duration between two events, small mistakes add up quickly when done manually.
These calculators handle the calendar arithmetic properly — leap years included — so you get an exact answer instead of an approximate one.
Several of these tools also apply UK-specific rules rather than generic date maths — annual leave entitlement follows the Working Time Regulations 1998 baseline of 5.6 weeks for a full-time employee, and working-day counts exclude weekends by default so they line up with how notice periods and deadlines are actually calculated in UK employment and business contexts.
All Time calculators
Age Calculator
Find your exact age in years, months and days from your birthday.
Time & Date Difference Calculator
Calculate the exact duration between two dates and times.
Annual Leave Entitlement Calculator
Work out statutory holiday entitlement for part-time or full-time work.
Working Days Calculator
Count working days between two dates, excluding weekends.
Countdown Calculator
Count down the days, hours and minutes to any future date.
Timezone Converter
Convert a time between UK and international timezones.
Holiday Cost Splitter
Split total trip costs fairly between travellers.
Frequently asked questions
Do these time calculators account for leap years?
Yes — date and duration calculations account for leap years automatically, since manual calculations often miss them and introduce small errors, especially over multi-year spans.