stboxsandbox tools
All tools

Time & Epoch Studio

Convert Unix timestamps to local/UTC, measure performance with multi-stopwatches, and set timers.

Formatters & Utilities
Privacy: 100% Client-Side. Your data never leaves this browser tab. Processing uses Web APIs and client-side libraries only.

100% client-side. Convert Unix epochs, run parallel stopwatches with laps, set countdowns (optional beep + notification), and compare times across common developer timezones.

Unix seconds (now)

1784684835

Unix milliseconds (now)

1784684835731

Detected as seconds (×1000 → ms)

Local time

Wed, Jul 22, 2026, 1:47:15 AM UTC

UTC / ISO 8601

2026-07-22T01:47:15.000Z

RFC 2822

Wed, 22 Jul 2026 01:47:15 GMT

Relative

just now

What is a Unix timestamp?

A Unix epoch timestamp counts seconds (or milliseconds) since 1970-01-01T00:00:00Z. APIs, logs, JWTs, and databases often store time this way because it is timezone-agnostic and easy to compare.

stbox Time Studio converts epochs to human-readable local and UTC forms, shows relative phrases like “2 minutes ago”, and adds practical developer timers: parallel stopwatches with lap splits (via performance.now), countdowns with optional audio/notifications, and a timezone matrix for UTC, US/Eastern, US/Pacific, London, Tokyo, and Kolkata.

How to use this tool

  1. Open Epoch converter to copy the live second/millisecond clocks or paste any 10/13/16-digit epoch for auto-detected conversion.
  2. Use Multi-stopwatch to add labeled timers (e.g. OAuth exchange), record laps, and export CSV/JSON.
  3. Set countdown presets (5m, 15m, 1h) or custom minutes; enable beep/notification if you want an alert when time is up. Compare any instant across zones in Timezone matrix.

Frequently asked questions

Is any time data sent to a server?

No. All conversion, stopwatches, countdowns, and timezone formatting run in your browser.

How does epoch auto-detection work?

Digit length and magnitude decide the unit: ~10 digits → seconds, ~13 → milliseconds, ~16 → microseconds. You can also paste ISO-8601 strings in the timezone tab.

How precise are the stopwatches?

They use performance.now() with requestAnimationFrame updates, showing millisecond or fractional-microsecond displays. Lap splits and totals can be copied as JSON or CSV.