Date & Time Calculators — Free & Instant

Calculate your exact age, the days between two dates, business days excluding weekends, or the ISO week number — free, private, no sign-up.

How to use VClock's date & time calculators

Step 1 Open the Calculators tool Tap the "More tools" card on the Clock view, or press 7 on your keyboard.
Step 2 Pick a calculator Switch between Age, Days Between Dates, Business Days, and Week Number using the tabs at the top.
Step 3 Enter your dates Use the native date pickers to select the dates you need, then tap Calculate.
Step 4 Read the result instantly Every calculation happens locally in your browser — no page reload, no data sent anywhere.

Age calculator — exact years, months, and days

VClock's age calculator gives a precise breakdown of your age in years, months, and days, alongside the total number of days elapsed since your date of birth. It correctly handles varying month lengths and leap years, so the result is exact regardless of when your birthday falls.

Business day counter — weekends excluded automatically

A business day (or working day) is any Monday through Friday. This is useful for estimating delivery times, project deadlines, or payroll periods where weekends don't count. VClock's counter excludes Saturdays and Sundays automatically from any date range you choose.

ISO week numbers — the international standard

The ISO-8601 week-numbering system is used across Europe for scheduling, invoicing, and project planning. Weeks start on Monday, and week 1 of a year is defined as the week containing that year's first Thursday — which occasionally means the last days of December belong to week 1 of the following year. VClock calculates this correctly for any date.

Eight tools, one tab

🕐 Digital Clock

Live 12 h or 24 h clock in a retro LCD font. Shows the full date, sunrise & sunset times for your location, and visual progress bars for the current day, week, month, and year.

⏰ Alarm

Set unlimited alarms with custom labels and optional repeat days (Mon–Sun). A cuckoo chime is synthesised directly in the browser via the Web Audio API — no audio files, no downloads required.

⏱ Stopwatch

Millisecond-precision stopwatch with lap recording and split times. Keeps running in the background while you switch to other views — your timing is never interrupted.

⏳ Countdown Timer

Visual SVG ring countdown with quick-set presets (1 min, 5 min, 10 min…) and a built-in Pomodoro mode (25 min focus / 5 min break). An audio chord plays when time is up.

📖 Study Timer

A Pomodoro study timer where the cycle is the whole interface. Pick 25 min / 5 min or 50 min / 10 min and it runs the focus and break blocks for you, taking a long break at the end of each cycle. Completed sessions are banked into a 30-day log of focused minutes, stored only in your own browser.

🌎 World Clock

Live times for 80+ cities across Europe, the Americas, Asia, Africa, and Oceania. Cities are grouped by continent and searchable by name or country. UTC offset shown for every timezone.

📅 Public Holidays

Look up public and bank holidays for any supported country and year. Plan your schedule around local and international holidays at a glance.

🧮 Date Calculators

The date and time calculators give your exact age in years, months and days; the number of days between two dates; business days with weekends excluded; and the ISO-8601 week number. Every calculation runs in your browser — no date you type is ever sent anywhere.

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Frequently Asked Questions

How does the age calculator work?

Enter your date of birth and an "as of" date (defaults to today). VClock calculates your exact age in years, months, and days, plus the total number of days you have been alive.

How do I calculate the days between two dates?

Open the Days Between Dates tab, pick a start and end date, and VClock instantly shows the total days along with a weeks-and-days breakdown.

What counts as a business day?

VClock's business-day counter counts Monday through Friday only — Saturdays and Sundays are automatically excluded from the count.

What is an ISO week number?

The ISO-8601 week number is the internationally standardised way of numbering weeks in a year, where week 1 is the week containing the first Thursday of January and weeks start on Monday.

Are these calculators free and private?

Yes. All calculations run entirely in your browser — no dates you enter are ever sent to a server, and no sign-up is required.

About VClock

VClock is a free, browser-based time utility built with vanilla TypeScript and Vite — no UI framework, no runtime dependencies. All fonts are self-hosted. Your preferences and alarms are stored locally in your browser and never leave your device.

VClock is available in English, German, French, Spanish, Italian, and Dutch. It is designed to be fast, accessible, and GDPR-compliant. The source uses the DSEG7 Classic LCD font by Keshikan, licensed under the SIL Open Font Licence 1.1.

VClock is supported by Google AdSense advertising, and by nothing else — there is no analytics product on this site. In the EEA, the UK and Switzerland, Google's certified consent message asks about advertising before any personalised ad is served, and the Privacy settings link below reopens it whenever you want to change or withdraw that answer. Full detail is in the privacy policy.