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digital-clock

A digital clock displays the current time in numeric form (HH:MM:SS) — useful as a fullscreen kitchen / studio / classroom clock, on a second monitor for time-zone awareness, or as a timer reference. The ZTools Digital Clock runs in any modern browser, supports 12-hour / 24-hour formats, optional seconds + date display, multiple time-zone clocks side by side, and a fullscreen mode for projector / monitor use. No ads, no upload, no signup — refreshes every second using performance.now() for drift-free accuracy.

Use cases​

Studio / classroom wall clock​

Project to a screen at the back of the room — every speaker can see the time.

Multi-timezone team awareness​

A remote team across NYC / London / Singapore — three clocks side by side gives instant coordination context.

Fullscreen kitchen timer reference​

Tablet on the kitchen counter; fullscreen clock with seconds for cooking timing.

Streaming / video on-screen clock​

For "this happened at" reference in long-form videos. Browser source in OBS / Streamlabs.

How it works​

  1. Pick format — 12-hour (with AM/PM) or 24-hour (military / international).
  2. Configure display — Show / hide seconds, date, day name. Pick font (sans / mono / segment-display).
  3. Add timezones — Up to 4 clocks side by side. Pick from any IANA timezone (America/New_York, Europe/London, Asia/Tokyo).
  4. Fullscreen — Toggle fullscreen for projector / monitor use. Browser handles the rest.

Examples​

Input: Default (24-hour, seconds, current TZ)

Output: 14:32:07 (refreshing every second).

Input: 12-hour with date

Output: 2:32:07 PM\nWednesday, May 6 2026.

Input: Multi-TZ: NYC, London, Tokyo

Output: Three columns. Different times. Useful at a glance for a global team.

Frequently asked questions​

How accurate is the time?

Refreshes every 1 second using performance.now() ticks. Browser tab clocks rely on the OS clock, which is sync'd via NTP. Accuracy: ±1 second from atomic time on a normal Internet connection.

Does it work offline?

Yes — once loaded. No server pings. Time comes from the OS clock.

Time zone abbreviations?

Displayed (e.g. EST, GMT, JST) — but DST handling varies. IANA timezone strings (America/New_York) are unambiguous.

Privacy?

No tracking, no analytics. Browser-only.

Tips​

  • Use 24-hour for international / engineering contexts; 12-hour for casual / US use.
  • For multi-timezone teams, label clocks with city / member name so each is unambiguous.
  • For studio use, dim the clock's background to dark to avoid screen glare.
  • For OBS browser sources, set the page CSS background to transparent and overlay the clock on your scene.

Try it now​

The full digital-clock runs in your browser at https://ztools.zaions.com/digital-clock — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-06 · Author: Ahsan Mahmood · Edit this page on GitHub