How does auto-detection work?

Modern timestamps fall in predictable magnitude ranges: a unix-seconds value for 2026 is around 1.78×10^9, ms is 1.78×10^12, us is 1.78×10^15, ns is 1.78×10^18. We pick the precision whose decade range your number falls into. Override if the value is unusual (e.g. a future date 100 years out).

Why might microsecond/nanosecond outputs lose precision?

JavaScript Number is a 64-bit float with 53 bits of mantissa — enough for ms precision over Date's full range, but ns values past 2^53 lose precision in the lower digits. For exact nanosecond math at large values, use a library like BigInt or display only the relevant digits.

What's the relative time based on?

Your browser's current time at page render. Refresh to update. Useful for sanity-checking whether a log timestamp is recent or old.

Unix Time Precision Converter

Different systems use different Unix timestamp precisions: PostgreSQL `now()` is microseconds, `Date.now()` in JS is milliseconds, Go `time.Unix()` takes seconds, gRPC `Timestamp` is seconds+nanos, Prometheus is float seconds, syslog is nanoseconds. When you copy a number from a log line and don't know the unit, this tool auto-detects (based on magnitude — billions = s, trillions = ms, etc.) and shows all four precisions plus human-readable formats: ISO 8601, RFC 2822 (UTC), local time, and 'X seconds ago / from now'. You can override the auto-detection if you know the source unit.

—

Number (timestamp)Precision

Detected precision: seconds (s)· input n = 1787274498

All precisions and formats

seconds (s)1787274498
milliseconds (ms)1787274498000
microseconds (µs)1787274498000000
nanoseconds (ns)1787274498000000000
UTC2026-08-21 01:08:18.000 UTC
ISO 86012026-08-21T01:08:18.000Z
RFC 2822Fri, 21 Aug 2026 01:08:18 GMT
LocalFri Aug 21 2026 01:08:18 GMT+0000 (Coordinated Universal Time)
Relative9s ago

Auto-detect uses magnitude (~10^9 = s, ~10^12 = ms, etc.). Override if your timestamp is far past/future.

How to use

Paste a number — commas, underscores, and whitespace are stripped.
Auto-detection picks s/ms/us/ns by magnitude. Override with the dropdown if it's wrong.
All four precisions and four datetime formats display side-by-side. Copy whichever your destination expects.

Frequently asked questions

How does auto-detection work?: Modern timestamps fall in predictable magnitude ranges: a unix-seconds value for 2026 is around 1.78×10^9, ms is 1.78×10^12, us is 1.78×10^15, ns is 1.78×10^18. We pick the precision whose decade range your number falls into. Override if the value is unusual (e.g. a future date 100 years out).
Why might microsecond/nanosecond outputs lose precision?: JavaScript Number is a 64-bit float with 53 bits of mantissa — enough for ms precision over Date's full range, but ns values past 2^53 lose precision in the lower digits. For exact nanosecond math at large values, use a library like BigInt or display only the relevant digits.
What's the relative time based on?: Your browser's current time at page render. Refresh to update. Useful for sanity-checking whether a log timestamp is recent or old.

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