Unix Timestamp Converter
Convert Unix timestamps to dates and vice versa. Supports seconds, milliseconds, and ISO 8601. Auto-detects input format.
Unix timestamp to human date — instant, privacy-first, no upload
Developers and operators regularly hit timestamps in API responses, database rows, log files, and shell scripts. This Unix timestamp converter removes the friction: paste a value, get the result, copy it, and move on. It supports Unix seconds, Unix milliseconds, ISO 8601 strings, and common human-readable date formats — all detected automatically.
Why another timestamp converter?
Most converters are buried inside SEO-heavy pages or require extra clicks. This one is designed for speed and low friction: open, paste, read, copy. The page loads fast, processes entirely in your browser, and never sends your input to a server. That makes it safe for private logs, internal IPs, API keys embedded in timestamps, and any workflow where uploading data is a compliance risk.
Who uses this tool
Backend developers debugging timezone issues in API responses, SREs reading log timestamps during incidents, data engineers normalizing ETL date columns, frontend developers correlating client-side events with server-side logs, and anyone reading a database dump that stores time as a Unix integer.
How to read the output
- UTC — Coordinated Universal Time, the standard for servers and logs.
- Local — your browser's timezone, useful for correlating with your own clock.
- ISO 8601 — the machine-readable format used in APIs and JSON.
- Unix (seconds) — the integer most systems store.
- Unix (milliseconds) — JavaScript's Date.now() format and common in message queues.
- Relative — how far the timestamp is from now, useful for "3 hours ago" or "in 2 days" context.
Practical tips
- Paste a 10-digit integer for Unix seconds (ranges from 2001 to 2286).
- Paste a 13-digit integer for Unix milliseconds.
- Paste any ISO 8601 string (e.g. 2024-05-24T15:30:00Z) for direct conversion.
- The current timestamp updates live so you can copy the latest value without refreshing.
Privacy and browser-side processing
All processing happens locally in your browser. Your timestamps and the resulting dates are never uploaded to a server. That means you can safely use this tool for production log debugging, internal IP correlation, and any workflow where timestamps may appear alongside sensitive data.
Common timestamp formats you will see in the wild
- Unix seconds (1716500000) — POSIX standard. Used by Unix, Linux, MySQL DATETIME exports, syslog, AWS CloudWatch, and most server-side log files.
- Unix milliseconds (1716500000000) — JavaScript Date.now(), Java System.currentTimeMillis(), Kafka, Kinesis, and modern message-bus payloads.
- Unix microseconds and nanoseconds — high-resolution logging in databases like Postgres timestamptz, distributed tracing (OpenTelemetry), and metrics pipelines.
- ISO 8601 (2024-05-24T15:30:00Z) — REST APIs, JSON payloads, RFC 3339, and JSON-LD structured data.
Daylight saving and timezone pitfalls
Unix timestamps are timezone-agnostic — they always count seconds since 1970-01-01 00:00:00 UTC. The confusion appears when you display them. A timestamp of 1700000000 is the same instant everywhere, but it renders as 2023-11-14 22:13:20 UTC, 2023-11-14 17:13:20 EST, or 2023-11-15 06:13:20 in Tokyo. This tool shows UTC and your browser's local time side by side so you can spot timezone drift in a log line at a glance.
Pro tips for backend and SRE work
- When debugging an API that returns timestamps in seconds, paste the integer in to confirm it falls in the expected range (a value around 1.7×10⁹ is roughly the current decade).
- If a stored value is suspiciously close to 0, the upstream system is probably emitting milliseconds since some non-Unix epoch (Excel 1900, .NET 0001) — convert and compare.
- For relative time on dashboards, prefer the ISO 8601 string so the rendering layer can localize on its own without losing UTC truth.
Related tools
People using the Unix timestamp converter often also need JSON Formatter, Base64 Encoder, URL Encoder, and JWT Decoder.
Frequently Asked Questions
Is this tool free to use?
Yes. The tool is free to use in your browser and does not require an account.
Do I need to install anything?
No. The workflow runs in a normal modern browser, so you can use it on desktop or mobile without installing extra software.
Is my input uploaded to a server?
No. All processing happens locally in your browser. Your code, tokens, and data never leave your device.
Can I use this for production work?
Yes, but always verify the output before using it in production. Keep a copy of your original input.
What should I check before using the result?
Review the output for accuracy, formatting, encoding, and compatibility with your target system before deploying or committing.
Why does the result look different from another tool?
Different tools may use different parsing rules, formatting defaults, or encoding behavior. Check the options and compare with your target platform requirements.