Free Unix Timestamp Converter
Last updated: March 16, 2026
A Unix timestamp converter transforms epoch time to human-readable dates and dates to Unix timestamps. Enter a timestamp or date below to convert instantly.
Convert Unix timestamps to human dates and dates to timestamps instantly. Live clock, seconds & milliseconds support. Free online tool — no signup required.
Developers, designers, content creators, and anyone who needs to quickly generate text, codes, or identifiers.
100% free, runs entirely in your browser — no signup, no data sent to any server.
How to Use the Unix Timestamp Converter Tool
Unix Timestamp Converter Features and Options
About the Free Online Unix Timestamp Converter
Notable Unix Timestamps
| Timestamp | Date (UTC) | Event |
|---|---|---|
| 0 | Jan 1, 1970 00:00:00 | Unix Epoch |
| 1000000000 | Sep 9, 2001 01:46:40 | 1 billion seconds |
| 1234567890 | Feb 13, 2009 23:31:30 | Sequential digits |
| 1700000000 | Nov 14, 2023 22:13:20 | 1.7 billion seconds |
| 2000000000 | May 18, 2033 03:33:20 | 2 billion seconds |
| 2147483647 | Jan 19, 2038 03:14:07 | Y2K38 (32-bit overflow) |
How to Convert Unix Timestamps Online
1. Choose your unit. Select whether your timestamp is in seconds (10 digits, standard Unix time) or milliseconds (13 digits, used in JavaScript and Java).
2. Convert timestamp to date. Paste a Unix timestamp into the first input and instantly see the date in local time, UTC, and ISO 8601 format. Click Now to load the current timestamp.
3. Convert date to timestamp. Use the date picker in the second section to select any date and time. The corresponding Unix timestamp appears instantly.
4. Copy your result. Each output has a Copy button. The live clock at the top always shows the current epoch time and can also be copied with one click.
Understanding Unix Time and Epoch Timestamps
Unix time is the system most computers use to track time internally. Rather than storing dates as complex strings with years, months, days, and timezones, Unix time reduces everything to a single integer: the number of seconds since January 1, 1970 at midnight UTC. This simplicity is what makes it so widely adopted across every programming language, database, and operating system.
Why a single number matters. When you need to compare two dates, store a timestamp in a database, or transmit time across an API, a single integer is far simpler than a formatted date string. There are no timezone ambiguities, no daylight saving time complications, and no date format conflicts (is 01/02/03 January 2nd or February 1st?). Unix timestamps are always UTC, always unambiguous, and always just math.
Seconds vs milliseconds. The original Unix timestamp uses seconds, but many modern systems use milliseconds for greater precision. JavaScript's Date.now() returns milliseconds, as do Java's System.currentTimeMillis() and most modern APIs. You can convert between them by multiplying or dividing by 1000. This tool supports both formats automatically.
The Year 2038 problem is the biggest known issue with Unix timestamps. Systems storing timestamps as 32-bit signed integers will overflow on January 19, 2038 at 03:14:07 UTC. The maximum 32-bit value (2,147,483,647) will roll over to a negative number, potentially displaying dates in 1901. Most modern systems already use 64-bit integers, which extend the range to approximately 292 billion years, but embedded systems and legacy software remain at risk.
Developers encounter Unix timestamps daily in server logs, database records, API responses, JWT tokens, file metadata, and cron job configurations. Understanding how to read and convert them quickly is a fundamental skill for backend development, DevOps, and debugging.
Frequently Asked Questions About Unix Timestamp Converter
What is a Unix timestamp?
A Unix timestamp (also called epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC, known as the Unix epoch. It provides a single integer that represents a specific moment in time, regardless of timezone.
What is the Unix epoch?
The Unix epoch is January 1, 1970 at 00:00:00 UTC. It was chosen as the reference point for Unix time because it was close to when Unix was created. All Unix timestamps are calculated as seconds before or after this moment.
What is the difference between seconds and milliseconds timestamps?
Standard Unix timestamps count seconds since the epoch (10 digits, like 1709683200). Millisecond timestamps count milliseconds (13 digits, like 1709683200000) and are commonly used in JavaScript (Date.now()), Java (System.currentTimeMillis()), and many APIs. This tool supports both formats.
What is the Year 2038 problem?
The Year 2038 problem (Y2K38) occurs on January 19, 2038 at 03:14:07 UTC, when the Unix timestamp exceeds the maximum value of a 32-bit signed integer (2,147,483,647). Systems using 32-bit integers for time will overflow and may interpret the date as December 13, 1901. Most modern systems use 64-bit integers, which will not overflow for 292 billion years.
How do I get the current Unix timestamp in code?
In JavaScript: Math.floor(Date.now() / 1000). In Python: import time; time.time(). In PHP: time(). In Java: System.currentTimeMillis() / 1000. In Bash: date +%s. All return seconds since the Unix epoch.
Can Unix timestamps be negative?
Yes. Negative timestamps represent dates before January 1, 1970. For example, -86400 represents December 31, 1969. This allows Unix timestamps to represent dates as far back as the system supports, though very old dates may have reduced precision.
Why do developers use Unix timestamps?
Unix timestamps are timezone-independent (always UTC), easy to compare mathematically (simple integer comparison), compact to store (a single number), and universally supported across programming languages and databases. They avoid the complexities of date string parsing and timezone conversion.
Is my data sent to a server?
No. All conversions happen in your browser using JavaScript. Your timestamps and dates never leave your device.
Related Free Online Tools
Convert timestamps here, then use our other developer tools for encoding, formatting, and data conversion.