Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and dates to timestamps. Supports seconds and milliseconds, multiple date formats including ISO 8601, UTC, and RFC 2822. Shows relative time.
Convert Unix timestamps to human-readable dates and vice versa. Unix timestamps (also called Epoch time or POSIX time) represent the number of seconds since January 1, 1970 (UTC). This tool supports both seconds and milliseconds, multiple output formats, and shows relative time. All processing is client-side.
100% Client-Side Processing
All conversions happen directly in your browser using JavaScript's built-in Date API. No data is sent to any server. This tool works offline after the page loads.
How to Use the Unix Timestamp Converter
- Choose conversion direction — select "Timestamp → Date" to convert a Unix timestamp to a readable date, or "Date → Timestamp" to get a timestamp from a date.
- Enter your value — type a Unix timestamp (seconds or milliseconds), or pick a date and time using the date/time pickers.
- View results — see the conversion in multiple formats including ISO 8601, UTC, RFC 2822, and local time, plus relative time (e.g., "3 days ago").
- Copy any format — click "Copy" next to any result row to copy it to your clipboard.
What is a Unix Timestamp?
A Unix timestamp (also called Epoch time, POSIX time, or Unix Epoch) is a system for tracking time as a running total of seconds. It counts the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC (the Unix Epoch).
Examples:
0 = January 1, 1970 00:00:00 UTC
1000000000 = September 9, 2001 01:46:40 UTC
1704067200 = January 1, 2024 00:00:00 UTC
Unix timestamps are used extensively in programming, databases, APIs, and system logs because they are timezone-independent and easy to store and compare as simple integers.
Common Use Cases
API Development
Parse and debug timestamps in API responses and requests
Database Queries
Convert stored timestamps to readable dates for analysis
Log Analysis
Translate timestamps in server logs and error reports
Debugging
Verify timestamp values during development and testing
Date Math
Calculate time differences using simple integer arithmetic
Timezone Handling
Work with UTC-based timestamps to avoid timezone issues
Related Tools
Working with dates? Try our Date Difference Calculator to find the days between two dates, or our Age Calculator for exact age in years, months, and days. For parsing cron schedules, use our Cron Expression Parser.
Frequently Asked Questions
What is the Unix Epoch?▼
The Unix Epoch is January 1, 1970, 00:00:00 UTC. It serves as the reference point from which Unix time is measured. All Unix timestamps are the number of seconds (or milliseconds) that have elapsed since this moment. Dates before the Epoch are represented as negative timestamps.
Seconds vs. milliseconds — which should I use?▼
Unix timestamps in seconds (10 digits, e.g., 1704067200) are the traditional format used in C, Python, PHP, and most Unix tools. JavaScript's Date.now() returns milliseconds (13 digits, e.g., 1704067200000). Java and .NET also commonly use milliseconds. Use whichever your system expects.
What is the Year 2038 problem?▼
Systems using a 32-bit signed integer for Unix timestamps will overflow on January 19, 2038, 03:14:07 UTC (timestamp 2,147,483,647). After this, the value wraps to a negative number, causing errors. Most modern systems now use 64-bit integers, which can handle timestamps far into the future.
Do Unix timestamps account for leap seconds?▼
No, Unix timestamps do not account for leap seconds. Each day is treated as exactly 86,400 seconds. When a leap second is inserted, Unix time either repeats a second or is adjusted by the system. This means Unix time differs slightly from UTC, but the difference is minimal (less than 30 seconds accumulated since 1972).
Frequently Asked Questions
❓ Is this tool free?
Yes! All our tools are completely free. No registration, no hidden charges, no ads. Just open and use.
🔒 Is my data safe?
Absolutely. All calculations happen in your browser. We don't store, send, or track any of your data. Everything is processed locally on your device.
📱 Can I use this on mobile?
Yes! All our tools are fully responsive and work perfectly on smartphones, tablets, and desktops.
🌐 Do I need internet?
No! Once the page loads, you can use the tool completely offline. All calculations happen in your browser without any server connection.