5 tools
Time & Date calculators
Count days, add to dates, find exact ages and total up working hours.
Exact age, days between dates, adding days to a date, time durations and weekly work hours. Leap years and overnight shifts are handled.
- ✓ Leap years handled correctly
- ✓ Weekday and business-day counts
- ✓ Handy for payroll, travel and deadlines
Age Calculator
Exact age in years, months, days — plus totals and next birthday.
Open calculator
Date Difference Calculator
Days between dates — with weekdays, weekends and inclusive counts.
Open calculatorTime Calculator
Hours between times, shift lengths and add-duration maths.
Open calculatorAdd or Subtract Days Calculator
Add or subtract days, weeks, months or years from a date — or count business days only.
Open calculatorWork Hours Calculator
Weekly timesheet: hours worked minus breaks, overtime and pay — overnight shifts included.
Open calculatorHow to get the most from time & date tools
Each time & date calculator has the same layout: the calculator at the top, then the formula, a worked example, common uses, tips, mistakes to avoid and the sources we used. Run your own numbers first, then use the related calculators at the bottom of the page to check from another angle, such as GST alongside Discount, or Age alongside Date Difference.
Calculations run in your browser, so the numbers you enter are not sent anywhere. If a figure is going into a contract, tax return or medical record, check it against the official source linked on the calculator page.
Common questions
Other categories
BMI Calculator
Know your Body Mass Index in seconds — with healthy-range context.
Open calculator
Percentage Calculator
What is X% of Y? What % is X of Y? Answered with steps.
Open calculator
Percentage Increase / Decrease Calculator
Old → new percent change, with increase vs decrease explained.
Open calculator