Free Timestamp Converter
Convert Unix timestamps to human-readable dates — and dates back to timestamps — in both directions. Paste a timestamp to see UTC, local time, and ISO 8601 instantly, or pick a date to get its Unix value. Seconds and milliseconds are auto-detected.
Converted date
Date → timestamp
Unix values
How to Use the Timestamp Converter
- Paste a Unix timestamp (seconds or milliseconds — auto-detected).
- Read the UTC, local, and ISO 8601 conversions instantly.
- Or pick a date and time below to convert the other way.
- Copy any value you need.
Features
The converter auto-detects seconds versus milliseconds by magnitude, so both 1700000000 and 1700000000000 work without toggling. Each timestamp renders as UTC string, browser-local time, and ISO 8601, plus a relative “x hours ago” readout. The reverse direction accepts a datetime picker and outputs both seconds and milliseconds, with one-click copying per value.
Benefits & Use Cases
Developers decode timestamps in logs, JWT exp claims, and database rows without mental math; support engineers translate customer-reported times; anyone scheduling across timezones sees UTC and local side by side. Instant local conversion keeps debugging loops tight.
Tips
Unix timestamps are always UTC — the “local” display just renders that instant in your browser’s timezone. If a timestamp looks like a date in 1970, you probably passed milliseconds where seconds were expected (or vice versa); this tool detects that automatically.
Frequently Asked Questions
What is a Unix timestamp?
The number of seconds (or milliseconds) elapsed since 00:00:00 UTC on 1 January 1970. It is the standard way computers store points in time — compact, timezone-free, and easy to compare.
How do I tell seconds from milliseconds?
Count the digits: 10 digits means seconds (valid until year 2286), 13 digits means milliseconds. This tool detects the unit automatically by magnitude, so you do not have to choose.
Why does the same timestamp show two different times?
The instant is identical — UTC shows it in Coordinated Universal Time while “local” renders it in your browser’s timezone. They describe the same moment differently.
What is ISO 8601?
An international date-time format like 2024-01-15T10:30:00.000Z. It is unambiguous, sorts alphabetically in chronological order, and is the recommended format for APIs.
Is my input sent anywhere?
No. All conversion math runs locally in your browser — nothing is uploaded or stored.
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