Do you handle leap years?

3 tools

Time & Date calculators

Time & date calculators that respect leap years, weekends and real calendars.

Age, date-difference and time-duration calculators that handle leap years, timezones and edge cases correctly.

Time & Date calculators — editorial still life representing the tools in this category. — 3 time & date tools — each with formula, worked example and FAQs.

✓ Leap-year correct age and interval maths
✓ Weekday / weekend breakdowns
✓ Ideal for HR, planning and milestones

time and-date#01

Age Calculator

Exact age in years, months, days — plus totals and next birthday.

Open calculator

time and-date#02

Date Difference Calculator

Days between dates — with weekdays, weekends and inclusive counts.

Open calculator

time and-date#03

Time Calculator

Hours between times, shift lengths and add-duration maths.

Open calculator

How to get the most from time & date tools

Every time & date calculator on CalcHive follows the same workstation pattern: validated inputs, Calculate and Reset controls, a result panel with steps, then a field guide with formula, worked example, five use cases, pro tips and mistakes. Start with the most popular tool in this shelf, run your real numbers, then use Related calculators to cross-check — for example, Discount with GST, or Age with Date Difference.

All calculations run privately in your browser and every page is statically generated for speed. If a figure will appear in a contract, tax return or medical record, treat our output as a rigorous draft and confirm with the authoritative source cited in the disclaimer.