What is a Unix timestamp?

A Unix timestamp (also called epoch time) is the number of seconds elapsed since January 1, 1970, 00:00:00 UTC. It is the near-universal way to represent a specific moment in time in programming because it reduces date comparison and arithmetic to plain integer math.

What is the Year 2038 problem?

Systems that store a Unix timestamp as a signed 32-bit integer overflow on January 19, 2038, wrapping to a negative number that represents a date in December 1901. Modern 64-bit systems and most current databases are unaffected, but it still matters for older embedded devices and legacy software.

Is the timestamp in seconds or milliseconds?

Classic Unix timestamps — and what this tool works in — are in seconds. JavaScript's own Date.now() returns milliseconds instead, which is a very common source of off-by-1000 bugs when a value from one context gets passed into code expecting the other.

How do I get the current timestamp in different languages?

JavaScript: Math.floor(Date.now()/1000). Python: import time; time.time(). PHP: time(). Unix shell: date +%s. All of these return seconds since the epoch, matching the format this tool expects.

What is the difference between this tool and Convert Datetime?

This tool is focused specifically on the Unix epoch timestamp — a live counter plus timestamp-to-date and date-to-timestamp conversion. Convert Datetime is broader: it takes any date input and renders it in eight formats at once, including ISO 8601 and RFC 2822, without the live-counter feature.

Can a Unix timestamp be negative?

Yes — a negative Unix timestamp represents a moment before January 1, 1970 UTC. Most systems support negative timestamps correctly, though some older or embedded systems may not handle them.

Why did my timestamp conversion show the wrong date?

The most common cause is a units mismatch — pasting a millisecond value (13 digits, e.g. 1700000000000) into a field expecting seconds (10 digits, e.g. 1700000000). Check the digit count: 10 digits is roughly the current era in seconds, 13 digits is the same era in milliseconds.

Does this tool support dates before 1970?

Yes, through negative timestamps, though very old or very far-future dates can hit the outer edges of what JavaScript's Date object can represent reliably (roughly ±275,000 years from 1970), which is far beyond any realistic use case.

Is my data private when I use this tool?

Yes. All parsing and formatting happens locally using the browser's built-in Date object — no timestamp or date you enter is ever sent to a server.

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Current Unix Timestamp

1789220131

Unix Timestamp → Date

Date → Unix Timestamp

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What is Convert Timestamp?

Convert Timestamp is a free online tool built specifically around the Unix epoch timestamp — a single integer counting seconds elapsed since January 1, 1970, 00:00:00 UTC. It shows a live, ticking counter of the current timestamp, converts any timestamp you paste in into five human-readable formats, and converts any date string you type back into its equivalent timestamp. If Convert Datetime is the general-purpose date format Swiss army knife, this tool is the focused version built around the one format that programmers actually store, compare, and pass around most: the raw epoch integer.

The Unix timestamp exists because comparing and storing dates as plain integers is dramatically simpler than comparing strings in different formats or timezones. Every database engine, most APIs, and the vast majority of backend languages have a native concept of epoch time specifically because sorting two timestamps is just sorting two numbers, and computing a duration between two events is just subtraction — no timezone math, no string parsing, no locale ambiguity. The tradeoff is that a raw number like 1700000000 means nothing to a human without a conversion step, which is exactly the gap this tool fills.

A classic gotcha developers run into constantly is unit confusion: Unix timestamps are conventionally in seconds, but JavaScript's own Date.now() and many JSON APIs return milliseconds instead. Feed a millisecond value into a function expecting seconds (or vice versa) and you'll get a date that's off by a factor of 1000 — either sometime in 1970 or thousands of years in the future. This tool works in the standard seconds convention used by most databases, Unix system calls, and REST APIs, matching what you'd get from Python's time.time(), PHP's time(), or the Unix shell's date +%s.

Another edge case worth knowing about is the so-called Year 2038 problem: systems that store the timestamp as a signed 32-bit integer will overflow on January 19, 2038, wrapping around to a date in December 1901. This mostly affects older embedded systems, 32-bit software, and certain legacy file formats — most modern 64-bit systems handle timestamps for billions of years into the future without issue. All conversions in this tool run using your browser's native Date object, with no server involved and no timestamp data ever transmitted anywhere.

How It Works

The tool multiplies your input timestamp by 1000 to convert Unix seconds into the milliseconds JavaScript's Date object expects internally, then constructs a Date and formats it five different ways: toISOString() for ISO 8601, toUTCString() for plain UTC, toLocaleString() for your local time, toLocaleDateString() with weekday/month/day options for a long date string, and toLocaleTimeString() with 24-hour formatting for a plain time string. For the reverse direction — date to timestamp — your typed string is passed to the Date constructor, and if it parses successfully, .getTime() (milliseconds since epoch) is divided by 1000 and rounded down to give the standard Unix timestamp. The live counter at the top of the page recalculates Math.floor(Date.now()/1000) every second using setInterval, giving you an always-current reference value without needing to reload the page.

How to Use

Enter a Unix timestamp

Paste a Unix timestamp (seconds or milliseconds since epoch) into the input field.

Convert to date

Click "Convert" to see the corresponding human-readable date and time in UTC and local time.

Convert date to timestamp

Alternatively, enter a date/time to get its Unix timestamp equivalent.

Copy the result

Copy the converted value for use in code, database queries, or API parameters.

Who Uses This Tool

🐛

Debugging API Responses

Paste a Unix timestamp straight from an API JSON response to instantly see the human-readable date and confirm it matches what you expected.

🗄️

Database Record Inspection

Decode raw epoch integers stored in database columns into readable dates when auditing records, writing a report, or debugging a data issue.

📊

Log File Analysis

Convert epoch timestamps found in application or server logs into local time to pinpoint exactly when an error or event actually occurred.

🔗

JWT & Signed URL Expiry

Decode the exp (expiration) claim embedded in a JWT token or a signed URL parameter into a readable date to check exactly when it expires.

📅

Scheduling & Cron Jobs

Convert a planned event date into a Unix timestamp when you need to pass it as a numeric parameter to an API call, cron job, or scheduler.

💻

Cross-Language Sanity Checks

Confirm the current epoch value your own language or shell produces (Python, PHP, JS, bash) by comparing it against the tool's live counter.

Why Choose This Tool

Live Timestamp Counter

A real-time counter shows the current Unix timestamp ticking upward every second, giving you an always-accurate reference value without reloading.

Bidirectional Conversion

Convert Unix timestamps to human-readable dates and convert dates back to Unix timestamps — both directions live on the same page.

Five Output Formats

Each converted timestamp is shown in ISO 8601, UTC, local time, a long weekday/month/day date, and 24-hour time simultaneously.

Instant Copy Buttons

Copy the live timestamp or any individual conversion result with one click, ready to paste directly into code, queries, or config files.

Standard Seconds Convention

Works in standard Unix seconds rather than milliseconds, matching the default expected by most databases, REST APIs, and backend languages.

Fully Browser-Based

No server round-trip is involved — conversions happen instantly using your browser's Date object, and nothing you enter is tracked or stored.

Key Benefits

Live current Unix timestamp display, updating every second

Convert Unix timestamp to five human-readable formats at once

Convert any parseable date string back to a Unix timestamp

Shows UTC and local time simultaneously for cross-checking

Zero dependencies — all browser-based

Works in standard seconds, matching databases, APIs, and Unix tools

Frequently Asked Questions

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Convert Timestamp

What is Convert Timestamp?

How It Works

How to Use

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Key Benefits

Frequently Asked Questions

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