🛠️ Web & Developer

Unix Timestamp Converter

Convert Unix epoch timestamps to human-readable dates and back. Supports seconds and milliseconds, with local and UTC output and a live current timestamp.

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Paste a Unix timestamp to see the date it represents, or pick a date to get its timestamp. The current epoch time ticks live at the top — click it to copy.

Current Unix Timestamp

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⏱️ Timestamp → Date

Unix Timestamp

Unit

Local Time

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UTC / GMT

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ISO 8601

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Relative

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📅 Date → Timestamp

Date

Time

Interpret As

Timestamp (seconds)

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Timestamp (milliseconds)

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What is a Unix Timestamp Converter?

A Unix timestamp converter translates between Unix epoch time — a single number representing a moment in time — and a human-readable date, in both directions. Unix time is used everywhere in software: in databases, log files, APIs, programming languages, and operating systems. Because it's just a number, it's compact and unambiguous, but unreadable to humans. This tool converts a timestamp into a clear date and time (in your local zone, UTC, and ISO format), and converts any date back into a timestamp.

It supports both seconds (the standard Unix format) and milliseconds (common in JavaScript and many APIs), shows the live current timestamp, and gives a relative "time ago" reading — making it an everyday utility for developers, testers, and anyone working with timestamped data.

What is Unix Time?

Unix time (also called epoch time or POSIX time) counts the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, known as the Unix epoch. It ignores leap seconds, making it a simple, steadily increasing count. A timestamp like 1750000000 represents a specific instant — the same instant everywhere in the world, regardless of time zone, which is exactly why software uses it.

Unix Timestamp = seconds since 1970-01-01 00:00:00 UTC

Date → Timestamp: milliseconds since epoch ÷ 1000
Timestamp → Date: new Date(timestamp × 1000)

Seconds format: 1750000000
Milliseconds format: 1750000000000

How to Use This Converter

To convert a timestamp to a date, paste the number into the first box, choose whether it's in seconds or milliseconds, and convert — you'll get the local time, UTC, ISO 8601 format, and a relative reading. To convert a date to a timestamp, pick a date and time, choose whether to interpret it as local or UTC, and convert to get the timestamp in both seconds and milliseconds. The current timestamp ticks live at the top.

Seconds vs Milliseconds

Standard Unix timestamps are measured in seconds — a 10-digit number for current dates. However, JavaScript's Date.now() and many APIs use milliseconds — a 13-digit number. A common bug is mixing the two: a millisecond timestamp read as seconds lands tens of thousands of years in the future. The quick check: 10 digits is seconds, 13 digits is milliseconds. This converter lets you specify which you're using so the result is always correct.

💡 Quick sanity check: current Unix timestamps in seconds are 10 digits (around 1.7 billion in the mid-2020s). If your number has 13 digits, it's milliseconds. If a converted date comes out wildly wrong — like the year 55,000 — you've almost certainly got the wrong unit selected.

Why Developers Use Unix Time

Unix timestamps are the lingua franca of computing time because they're unambiguous and easy to work with. A single integer represents an exact moment with no time zone confusion, no date-format ambiguity (is 03/04 March or April?), and trivial maths — finding the difference between two times is just subtraction. Databases store them efficiently, logs sort by them naturally, and APIs exchange them cleanly across systems and languages. They're then converted to human-readable form only at the point of display.

What is the ISO 8601 Format?

ISO 8601 is the international standard for representing dates and times as text, like 2026-06-15T10:30:00Z. It writes the date from largest unit to smallest (year-month-day), uses a 24-hour clock, and the "Z" denotes UTC. It's widely used in APIs and data exchange because it's unambiguous, sorts correctly as plain text, and is human-readable. This converter outputs ISO 8601 alongside the timestamp so you can use whichever your system expects.

The Year 2038 Problem

Older systems store Unix time in a signed 32-bit integer, which can only count up to 03:14:07 UTC on 19 January 2038 before overflowing — a glitch nicknamed the "Year 2038 problem" or "Y2038". Modern systems use 64-bit integers, which push the limit billions of years into the future, so it's largely a concern only for legacy embedded systems. It's a reminder of why understanding timestamp formats matters in software.

Frequently Asked Questions

What is a Unix timestamp?

A Unix timestamp is the number of seconds that have passed since 00:00:00 UTC on 1 January 1970 (the Unix epoch). It's a single number representing an exact moment in time, used throughout software for storing and exchanging dates because it's compact, unambiguous, and time-zone independent. For example, 1750000000 corresponds to a specific date in 2025.

How do I convert a timestamp to a date?

Paste the timestamp into the "Timestamp → Date" box above, select whether it's in seconds or milliseconds, and convert. You'll get the date in your local time, UTC, ISO 8601 format, and a relative "time ago" reading. The converter handles the maths and time-zone formatting automatically.

What's the difference between seconds and milliseconds timestamps?

A seconds timestamp counts seconds since the epoch (a 10-digit number currently), while a milliseconds timestamp counts thousandths of a second (a 13-digit number), common in JavaScript and many APIs. They differ by a factor of 1,000. Selecting the wrong unit produces a date that's wildly off, so always match the unit to your source.

What is the current Unix timestamp?

The live current Unix timestamp is shown ticking at the top of this tool — it's the number of seconds since 1 January 1970 UTC right now. You can click it to copy. Current values are around 1.7 billion (a 10-digit number) in the mid-2020s, increasing by one every second.

Is a Unix timestamp the same everywhere in the world?

Yes — that's its key advantage. A Unix timestamp represents the same exact instant regardless of time zone, because it's defined in UTC. Two people in different countries reading the same timestamp see the same moment; only when it's converted to a human-readable local time does the displayed clock value differ by their time-zone offset.

How do I get a timestamp from a date?

Use the "Date → Timestamp" section: pick a date and time, choose whether to interpret it as your local time or UTC, and convert. You'll get the Unix timestamp in both seconds and milliseconds, ready to copy into your code, database, or API request.

What is the Year 2038 problem?

It's a limitation in older systems that store Unix time as a signed 32-bit integer, which overflows on 19 January 2038. After that point, such systems would misinterpret the time. Modern 64-bit systems aren't affected for billions of years, so it mainly concerns legacy and embedded software that hasn't been updated.

Is this converter private?

Yes. All conversions happen in your browser using JavaScript — nothing you enter is sent to a server or stored. The tool works instantly and offline once loaded, making it safe and fast for everyday development use.