Date calculators and timers

Calculate days or age by date and run countdown or Pomodoro timers directly in your browser.

Date Difference

Calculate days between two dates, inclusive day counts, and rough week estimates locally in your browser.

Countdown Timer

Set a simple countdown timer for hours, minutes, and seconds, with practical presets for focus, breaks, cooking, and meetings.

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Pomodoro Timer

Run focus sessions, short breaks, and long breaks with a simple browser Pomodoro timer.

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Age Calculator

Calculate age in years, months, and days from a birth date to a target date.

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Use a calculator for calendar questions and a timer for live sessions

Date calculations depend on whether the first and last dates are included. Timers depend on the browser tab staying open. Confirm those rules before using a result for a booking, deadline, class, or work session.

Use the ordinary date difference for elapsed nights or days; use inclusive count when both calendar dates should count.
Set the target date in Age Calculator when a form or eligibility rule uses a date other than today.
Keep the tab open and the device awake when a countdown or Pomodoro notification matters.

Task	Start with	Why
Count days between two dates	Date Difference	Shows ordinary and inclusive day counts.
Calculate age on a specific date	Age Calculator	Returns years, months, days, and next-birthday timing.
Run a simple countdown	Countdown Timer	Supports hours, minutes, seconds, pause, and reset.
Alternate focus and breaks	Pomodoro Timer	Tracks work rounds, short breaks, and long breaks.