Tip: 10 digits = seconds, 13 digits = milliseconds. You can also
suffix s or ms.
Uses your local timezone (your browser's).
Share links via ?e= (epoch) or ?d=
(datetime-local).
Results
Copy buttons are per-result. URL updates happen without reloading the page.
What this tool surfaces fast
During log reviews you need to know whether that alert pinged before deploy, after deploy, or smack in the middle of quiet hours. Paste an epoch value and you instantly see the exact date, the UTC reading, and how it lands in your own timezone.
- Compare “server truth” (UTC) with what on-call humans experienced locally.
- Jump between seconds and milliseconds outputs to match whichever format your system expects.
- Grab copyable rows for status updates or attach the share link inside tickets.
How to use it well
- Paste suspicious timestamps straight from logs—commas, spaces, or unit suffixes are fine.
- Toggle the epoch mode only when you know the source format; otherwise let auto-detect stop mistakes.
- Use the date picker to sanity-check future schedules or backfill missing epoch values.
- Keep the tab open during incidents so you can convert multiple entries without reloading.
Common mistakes
- Mixing seconds and milliseconds (10 digits vs 13). The result will be off by ~31 years.
- Assuming logs are in local time; most are UTC unless explicitly noted.
- Copying timestamps without context—always pair them with the converted timezone.
- Forgetting that the date picker uses your browser’s timezone while pasted epochs remain absolute.
- Ignoring negative values when backfilling historical data—yes, pre-1970 entries exist.
Quick answers
How do I know if it was seconds or milliseconds?
10 digits usually means seconds, 13 means milliseconds. You can override via the Epoch mode dropdown or suffix timestamps with s/ms.
Which timezone powers the date input?
Your browser’s local timezone. The results panel shows both UTC and your local reading so you can compare.
Can I share a conversion with the incident channel?
Yes. The URL updates with ?e= or ?d= so pasting the link reproduces the same values for everyone.
What about historical or negative epochs?
They work. Use them to refer to pre-1970 events or offsets before “epoch zero.”
Related tools
Need deeper context?
These guides add background if you want to dive beyond the quick conversions.