Date & Time Calculators & Converters

Plan ahead and track time with precision.

9 tools

About Date & Time

Date and time calculators for every planning need — age, date difference, days-until, business-day calculator, time zone converter, world clock, time duration, and Hijri-Gregorian conversion. Whether you're planning a project deadline, calculating someone's exact age in years/months/days, or coordinating a meeting across multiple time zones — these tools give you precise answers instantly.

Built around the standard Gregorian and Hijri (Islamic lunar) calendars with full leap-year handling, business-day awareness, and DST-aware time-zone math. No external API calls — everything runs locally in your browser.

Hijri ↔ Gregorian

Bidirectional Islamic ↔ Western calendar conversion, accurate from 622 CE onwards.

DST-aware

Time zone calculations correctly handle daylight saving transitions for every IANA zone.

Business-day mode

Add/subtract working days while skipping weekends — perfect for project deadlines and SLAs.

Most Used

Most Popular in Date & Time

The 4 tools our users open most often in this category.

4 picks

Age Calculator

Calculate exact age in years, months, and days from date of birth.

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Date Difference Calculator

Calculate the exact difference between any two dates in multiple units.

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Working Days Calculator

Count working days (Mon-Fri) between two dates, excluding weekends.

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Countdown Timer

Live countdown in days, hours, minutes, and seconds to any future date.

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All Date & Time Tools

Browse all 9 calculators

Age Calculator

Calculate exact age in years, months, and days from date of birth.

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Date Difference Calculator

Calculate the exact difference between any two dates in multiple units.

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Working Days Calculator

Count working days (Mon-Fri) between two dates, excluding weekends.

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Countdown Timer

Live countdown in days, hours, minutes, and seconds to any future date.

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Add / Subtract Days Calculator

Add or subtract days, weeks, months, or years from any date.

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Time Duration Calculator

Calculate the duration between two times in hours and minutes.

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Time Zone Converter

Convert time between any two cities or time zones worldwide.

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Pomodoro Timer

Focus timer with 25-min work sessions, 5-min breaks, and a long break every 4 cycles. Customizable durations + sound.

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World Clock & Meeting Planner

Side-by-side clocks for cities worldwide. Plan meetings across time zones with live work-hours indicators.

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Frequently Asked Questions

How does the age calculator handle leap years?

Exactly. It tracks the actual day-of-year and gives you age in years, months, and days down to the precise day count — leap years and varying month lengths handled correctly.

Can I calculate the date X business days from today?

Yes — the Add/Subtract Days calculator has a 'business days only' mode that skips Saturdays and Sundays automatically.

How accurate is the Hijri conversion?

It uses the tabular Islamic calendar (Umm al-Qura standard), accurate to ±1 day vs visible-moon-sighting locally. For exact ritual dates (Eid, Hajj), confirm with your local mosque or moon-sighting committee.

Are time-zone calculations DST-aware?

Yes. Tools use the browser's IANA time-zone database which knows the historical and future DST rules for every zone — so a March meeting between London and New York shows the correct hour shift.