PrecisionCrafted for Time
TimeDuration.net is a growing set of time calculation tools — accurate to the second, free to use and private by design. We sweat the details so your sums come out right first time.
Our Story
It started with one calculator that simply had to be right.
TimeDuration.net began with a single Time Duration Calculator, built after one too many online tools got an overnight shift wrong, buried the answer under adverts, or ignored leap years. The goal was simple: fast, exact, and pleasant to use.
That one tool has become a suite of 26 specialised time calculators — payroll, timesheets, overtime, countdowns, time zones, ages and more. Every one is free, works in your browser, and never sends the numbers you type to a server.
We also think everyday utilities deserve real design. The Art Deco-inspired dark luxury design — champagne gold on deep black, watch-face dials — is there to make checking a time feel calm and clear rather than cluttered.
What We Stand For
The principles behind every calculator we publish.
Precision First
Leap years, daylight saving changes, time-zone offsets and midnight crossings are handled deliberately, not left to chance — the edge cases are where most time tools slip.
Privacy by Design
Calculations happen on your device. We don't run analytics cookies or process your times on a server — the dates and hours you enter stay with you.
Craft & Quality
Utility tools can still be well made: considered typography, gentle motion and a consistent dark-and-gold look that keeps the focus on the answer.
Accessible to All
Every tool works on phones, tablets and desktops in any modern browser, with nothing to download or pay for. The main Time Duration Calculator is also available in 21 languages.
Built to Last
Pages are generated as static HTML with small, dependency-free scripts, so they load quickly and keep working without constant maintenance.
Continuous Improvement
We keep refining existing calculators and adding new ones, guided by the feedback people send us.
How We Build
The technology and the thinking behind the tools.
Client-Side Architecture
Each calculation runs in your browser in plain vanilla JavaScript, with no server round-trip, so results appear in well under 1 millisecond and your data never leaves the device.
Astro Framework
Pages are built with Astro, which ships plain HTML by default and adds JavaScript only where a page is interactive — the main reason the site feels quick.
Real-Time Visuals
SVG chronographs, live gauges and animated diagrams show what a calculation means, not just the number it produces.
Fast on Every Device
Semantic HTML, accessible controls, structured data and lightweight pages keep the tools quick to load and easy to use on any screen.
Start Calculating
Pick a calculator and get your answer — precise, private and free.