Build your Date & Age Calculator with AI in under 5 minutes

Build a date and age calculator that finds the time between two dates, your exact age, or adds and subtracts days, months, and years — with full year/month/day breakdowns. Everything runs in the browser.

Cómo funciona

Paso 1

Describe tu idea

Escribe un prompt describiendo lo que quieres.

Paso 2

La IA lo construye

FloopFloop genera código listo para producción al instante.

Paso 3

Despliega y publica

Tu proyecto se aloja en su propio subdominio en minutos.

¿Por qué construir con IA en lugar de contratar un desarrollador?

	FloopFloop	Desarrollador tradicional
Tiempo de lanzamiento	Menos de 5 minutos	2-8 semanas
Costo	Desde $0	$5.000 - $50.000+
Mantenimiento	Incluido	Contrato continuo

What is a date & age calculator?

A date and age calculator answers the small calendar questions that come up constantly: how old am I exactly, how many days until the wedding, how long did that project run, what date is 90 days from today and what weekday is it. The canonical tools — the 'age calculator' and 'date duration calculator' results that top the search page — do three jobs: the difference between two dates, an exact age as of today, and adding or subtracting a span from a date. They look trivial, but two details separate a correct one from a wrong one. The first is the year/month/day breakdown: people want '25 years, 11 months, 21 days,' counted the way you'd count by hand, not a raw day total. The second is correctness on the edge cases — leap years, and month-ends where 'one month after January 31' should be the end of February, not a date that doesn't exist. A surprising number of tools also drift by a day because they do the math in local time, where a daylight-saving change can move a result across midnight.

Common features

Difference between two dates, broken into years / months / days
Totals: total days, total weeks, total months
Exact age as of today from a date of birth
Day of the week for any date (and the day you were born)
A countdown to the next birthday or anniversary
Add or subtract years, months, and days from a date
Correct leap-year handling (Feb 29)
Intuitive month-end math (Jan 31 + 1 month = Feb 28/29)
UTC-based math so daylight saving never shifts a day
Everything client-side; light and dark themes; inputs remembered

Real-world examples

How old am I, exactly?

Someone enters their birthdate and gets '25 years, 11 months, 21 days,' the weekday they were born, and a count of days until their next birthday.

Counting down to a date

A couple checks how many days, weeks, and months until the wedding by dropping the two dates into the difference mode.

Working out a deadline

A freelancer adds a 30-day notice period to a start date and sees both the end date and that it lands on a Tuesday.

Why FloopFloop fits date & age calculator projects

A date calculator is a tiny tool you want instant, ad-free, and accurate. FloopFloop ships the calculator you want — the modes you use, the breakdown you prefer, your own additions like business-day counting — on your own domain, with everything computed in the browser. The clean 'almanac' look that ships by default states the answer in plain language rather than burying it in a results table, and the whole thing is one prompt away from being whatever fits your need.

Prueba estos prompts

Copia cualquier prompt y pégalo en FloopFloop para empezar.

Build a date and age calculator with three modes. Difference: pick two dates and show the gap as years, months, and days plus total days, weeks, and months, with the weekday of each date. Age: enter a birthdate and show the exact age as of today, the day of the week they were born, and a countdown to their next birthday. Add/subtract: take a date and add or subtract years, months, and days to get a new date and its weekday. Handle leap years and month-ends correctly (Jan 31 + 1 month = Feb 28), compute everything at UTC midnight so daylight saving never shifts a day, and read 'today' on the client so the first render is hydration-safe. Show a big plain-language answer card; keep it 100% client-side.

Create an age calculator like the ones that tell you 'you are 25 years, 11 months, and 21 days old.' Enter a date of birth, get the exact age plus total days lived and days until the next birthday. No sign-up, runs in the browser.

Build a 'days between two dates' calculator: two date pickers and a clear result in days, weeks, and months, plus the calendar breakdown. Add a dark theme.

Build a date math tool that adds or subtracts a number of days, weeks, months, or years from a starting date and tells me the resulting date and what day of the week it falls on — useful for deadlines and due dates.

Preguntas frecuentes

How is the age / difference calculated?

The way you'd count by hand: whole years first, then whole months, then the leftover days. So from 2000-06-15 to 2026-06-05 is 25 years, 11 months, 21 days — not just a pile of days. It also reports the totals (total days, weeks, months) for when you need a single number.

Does it handle leap years and awkward month-ends?

Yes — that's the part naive calculators get wrong. Leap days (Feb 29) are counted correctly, and month-end math is intuitive: adding one month to January 31 lands on the last day of February rather than spilling into March. A Feb-29 birthday's countdown rolls to Feb 28 in common years.

Why are the results sometimes off by a day in other tools?

Usually a timezone bug: doing date math with local time means a daylight-saving change can nudge a result across midnight. This tool computes everything at UTC midnight, so the day count is stable no matter where you are or when DST flips.

What can I use it for?

Working out your exact age or someone's age, counting down to a wedding, launch, or due date, finding how many days a project ran, or adding a notice period or deadline to a start date and seeing which weekday it falls on.

Is anything sent to a server?

No. Every calculation runs in your browser and your inputs are saved to localStorage only. The single outbound surface is the /api/health probe.

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