Date, Time & Age

What are date, time & age tools?

Date, time & age tools are calculators that handle anything involving dates and clock time: working out an exact age, counting days or weeks between two dates, comparing the gap between two ages, totalling a time duration, counting working days, and counting down to an event. They solve everyday problems that are tedious by hand because months, years and clocks vary in length. Students, HR and payroll staff, project managers and event planners rely on them.

Date, Time & Age tools on Toolzent

Here are the date, time & age calculators currently available, each with worked examples on its page.

Tool	What it does
Chronological Age Calculator	Calculates exact age in years, months and days from a birth date as of today or any reference date.
Date Difference Calculator	Finds the time between two dates, expressed in days, weeks, months or years.
Age Gap Calculator	Works out the difference between two people’s ages from their birth dates, in years, months and days.
Business Days Calculator	Counts the number of working weekdays between two dates, skipping Saturdays and Sundays.
Time Duration Calculator	Totals the elapsed time between a start and end time in hours, minutes and seconds.
Days Until Calculator	Counts down the days remaining from today until a future date such as an event or deadline.

Key date, time & age terms to know

These terms come up often when working with dates, ages and clock time.

Term	What it means
Chronological age	The time elapsed since birth, usually shown in years, months and days.
Date difference	The total span between a start date and an end date.
Age gap	The difference in age between two people, measured from their birth dates.
Time duration	The elapsed clock time between a start time and an end time.
Business day	A weekday (Monday to Friday) excluding weekends, used for working-day totals.
Countdown	The number of days remaining from today until a chosen future date.
Inclusive vs exclusive counting	Whether both endpoints are counted, which can shift a day total by one.

When counting days, decide up front whether you need an inclusive total (both endpoints counted) or an exclusive one, since the two can differ by a day.

How do I choose the right tool?

Match the tool to your question.

• To know how old someone is now, or on a future or past date, use the Chronological Age Calculator.
• To measure the span between two specific dates, such as a project start and deadline, use the Date Difference Calculator.
• To compare two people’s ages, for example partners or siblings, use the Age Gap Calculator.
• To total elapsed clock time, such as a shift or a workout, use the Time Duration Calculator.
• To plan deadlines, payroll periods or delivery windows that ignore weekends, use the Business Days Calculator.
• To count down to a birthday, holiday or launch, use the Days Until Calculator.

In short: pick the age calculator for one person, the age gap calculator for two people, the date difference calculator for any calendar span, the time duration calculator for hours and minutes, the business days calculator when only weekdays count, and the days until calculator for a countdown.

Why use Toolzent’s date, time & age tools?

Toolzent’s date, time & age tools are 100% free with no sign-up required. They run privately in your browser, so the dates you enter stay on your device, and they return results instantly. As a worked example, a birth date of 1990-06-09 gives an age of exactly 36 years on 2026-06-09, while 2026-06-05 to 2026-06-10 spans 5 calendar days but only 3 business days because the Saturday and Sunday in between are skipped, and a shift from 09:00 to 17:30 totals a duration of 8 hours and 30 minutes. Every tool is mobile-friendly and handles leap years and uneven month lengths accurately.

For related calculations, explore the Math & Algebra, Finance & Investing and Health & Medical category hubs.