Unix Timestamp Converter: Epoch to Date & Date to Epoch
Paste a Unix timestamp to read it as a full date, or paste a date to get the epoch back. The current epoch ticks live in seconds and milliseconds, seconds-vs-ms is detected automatically, and every field copies with one click. Nothing is uploaded.
What is the unix timestamp converter?
The Unix Timestamp Converter turns epoch values into human dates and back, auto-detecting seconds versus milliseconds and showing ISO 8601, UTC, local and relative time. A live-ticking epoch clock runs in seconds and milliseconds, and every field copies in one click. Free and fully in-browser, with nothing uploaded.
The GigAI Unix Timestamp Converter is a desktop-grade epoch workbench that runs entirely in your browser. At the top a live clock counts the current Unix time in both seconds and milliseconds, ticking every frame so you can grab a fresh value the instant you need one. Drop any number into the converter and it decides for you whether it's seconds or milliseconds (a heuristic that treats values under 1e11 as seconds) then expands it into a full ISO 8601 string, a human-readable UTC rendering, the same moment in your browser's local timezone, a relative phrase like "3 hours ago", and the day of the week. Feed it a date instead (an ISO string, an RFC-style date, or anything JavaScript's Date can parse) and it hands back the epoch in seconds and milliseconds. Unlike most epoch tools we're honest about timezones: without a bundled tz database we render UTC and the viewer's own machine zone, and we say so, rather than pretending to convert to an arbitrary named zone. Every output field has its own copy button, the interpretation is shown explicitly so there's no ambiguity, and because it's all local, timestamps from your logs, auth tokens, database rows and cron jobs never leave your device.
- Difficulty:
- Easy
- Typical time:
- ~15s
- Processing:
- 100% browser processing
Last updated
How to use the unix timestamp converter
- 1
Enter a timestamp or a date
Type or paste a Unix timestamp (seconds or milliseconds) (or a date/ISO string) into the converter. You can also load the built-in sample to try it instantly.
- 2
Read every rendering
See the moment as ISO 8601, UTC, your local timezone, a relative phrase and the weekday. The tool shows exactly how it interpreted your input.
- 3
Copy the format you need
Click the copy button next to any field (ISO, UTC, local, relative, epoch seconds or epoch milliseconds) to put just that value on your clipboard.
- 4
Grab the live 'now' when needed
Copy the current Unix time straight from the ticking clock at the top, or share a link that reopens the tool with your value pre-loaded.
What Unix Timestamp Converter includes
Live-ticking epoch clock
The current Unix time updates continuously in both seconds and milliseconds, so you can copy a fresh, exact 'now' value without reaching for a shell or a snippet.
Auto seconds vs milliseconds
Paste a bare number and the tool detects whether it's epoch seconds or milliseconds automatically, then tells you which it assumed so there's never any doubt.
ISO, UTC, local & relative
Every timestamp expands into an ISO 8601 string, a full UTC rendering, the same instant in your browser's timezone, a relative phrase, and the weekday.
Bidirectional conversion
Go epoch-to-date or date-to-epoch in the same panel. Type an ISO or human date and get the timestamp back in both seconds and milliseconds instantly.
Copy every field
Each output (ISO, UTC, local, relative, seconds and milliseconds) has its own one-click copy button, so you grab exactly the format you need.
100% in your browser
Conversion uses the browser's native Date and Intl engines on your device. No timestamp, log line or token is ever uploaded, stored or logged.
Why use our unix timestamp converter
Read raw log timestamps instantly
Turn a naked epoch from a log, cookie or database row into a readable date (with the weekday and a 'how long ago' phrase) without doing mental arithmetic.
Never guess seconds vs milliseconds again
The 1e11 heuristic and an explicit 'interpreted as' label mean a 10- vs 13-digit number is never mistaken, which is the single most common epoch bug.
Grab an exact 'now' on demand
The live clock gives you a precise current epoch in seconds or milliseconds to paste into a test, a token payload or a database seed in one click.
Private by design
Because everything runs locally, timestamps tied to auth sessions, audit logs or user data stay on your machine and are never transmitted.
Built for the way you work
From quick one-off fixes to daily workflows, see how people put this tool to use.
- Backend developer
Decode a token or log epoch
Paste an exp claim, a created_at column or a log timestamp to see the exact UTC and local time and how long ago it was, without leaving the browser.
- SRE / DevOps
Correlate incident timelines
Convert epochs from different systems into a single UTC reference so alerts, deploys and log lines line up on one timeline during a postmortem.
- QA engineer
Build time-based test fixtures
Grab a precise current epoch in milliseconds, or convert a target date to a timestamp, to seed deterministic fixtures and assert time-dependent behaviour.
- Data analyst
Interpret exported millisecond stamps
Confirm whether an exported column is in seconds or milliseconds and read it as a human date before loading it into a report or a query.
Supported formats
Accepts Unix seconds, Unix milliseconds, ISO 8601 and Date string, and produces ISO 8601, UTC, Local, Relative and Unix seconds, all processed locally in your browser.
- Unix seconds
- Unix milliseconds
- ISO 8601
- Date string
- ISO 8601
- UTC
- Local
- Relative
- Unix seconds
- Unix milliseconds
Frequently asked questions
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Common problems, solved
Hit a snag? Here are quick fixes for the issues people run into most.
My timestamp resolves to a date in 1970.
You almost certainly pasted a milliseconds value that was read as seconds, or vice versa. Check the digit count (10 digits is seconds, 13 is milliseconds) and note the 'interpreted as' label. Adjust the value if the tool's automatic guess doesn't match your source system.
My date string won't parse.
The browser's Date parser is strict about some formats. Prefer full ISO 8601 like 2026-06-24T13:45:00Z. Ambiguous forms (bare 'DD/MM/YYYY', or a time with no date) may be rejected or misread. Add an explicit date and, ideally, a timezone offset.
The local time doesn't match my expected zone.
Local time reflects the timezone set on the device you're viewing from, not a chosen zone. If you need a specific zone, use the absolute UTC or ISO output as the source of truth. This tool intentionally only renders UTC and your machine's local zone.
Get the most out of it
A 10-digit number is almost always seconds. A 13-digit number is almost always milliseconds, the tool confirms which it used.
Copy the live epoch straight from the ticking clock to paste an exact 'now' into a test or token payload.
Use the ISO 8601 field for anything that must be timezone-unambiguous across machines and services.
If a converted date lands near 1970, you likely pasted milliseconds as seconds (or the reverse): recheck the digit count.
Share the link to reopen the tool with your timestamp pre-loaded when handing a value to a teammate.
What's new
Recent updates and improvements to the unix timestamp converter.
Initial release: live-ticking epoch clock (seconds + ms), bidirectional epoch↔date conversion with auto seconds/ms detection, and ISO 8601, UTC, local, relative and weekday renderings.
Added per-field copy buttons, an explicit 'interpreted as' label, keyboard shortcuts and shareable links that pre-load your value.
Refined seconds-vs-milliseconds heuristic messaging and improved error handling for out-of-range numbers and unparseable date strings.
Keep exploring
Problems we solve
Definitions
From the blog
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Common tasks
Your privacy is built in
Every timestamp and date is converted entirely in your browser using its native Date and Intl engines. Nothing is uploaded to any server. No values are stored, logged or transmitted, so you can safely convert epochs from tokens, audit logs or personal records. Close the tab and every trace is gone.
- Runs in your browser
- No uploads
- Nothing stored
Ready to try the unix timestamp converter?
Free, private and instant. Unix Timestamp Converter runs right in your browser.