Is the Timestamp Converter free?

Yes, the Timestamp Converter is completely free to use with no limits. Convert as many timestamps as you need without registration or payment.

Does the tool handle millisecond timestamps?

Yes, the tool automatically detects whether your input is in seconds or milliseconds and converts accordingly. Timestamps with 13 digits are treated as milliseconds, while 10-digit timestamps are treated as seconds.

What time zone does the converter use?

The tool displays results in both UTC and your local time zone. Unix timestamps themselves are always in UTC, but the tool converts to your browser's local time zone for convenience.

What is the maximum timestamp the tool supports?

The tool supports timestamps within the range of JavaScript's Date object, which covers dates from approximately 271,821 BC to 275,760 AD. This far exceeds any practical use case.

What is the difference between seconds and milliseconds?

Unix time is conventionally counted in seconds since 1 January 1970 UTC, but JavaScript, Java and most JSON APIs use milliseconds. A ten-digit number is seconds; a thirteen-digit number is milliseconds, and that digit count is the fastest way to tell them apart.

What time zone are the results shown in?

Both. The human-readable output uses your computer's local time zone and names it, and a UTC line is shown alongside so you can compare without doing the arithmetic yourself.

Does the converter handle negative timestamps?

Yes. Negative values are dates before 1970, so -86400 is 31 December 1969. They appear less often than you would think, but database exports of historical records do produce them.

What is the year 2038 problem?

Systems that store Unix time in a signed 32-bit integer overflow on 19 January 2038, at timestamp 2147483647, and wrap to 1901. This tool is not affected, because JavaScript numbers are far wider, but a timestamp near that value in your data is worth investigating.

What is the largest date the converter handles?

JavaScript dates span roughly 273,000 years either side of 1970, which corresponds to timestamps up to about 8.64e15 milliseconds. Beyond that the result is an invalid date rather than a wrong one.

Do timestamps account for leap seconds?

No, and neither does Unix time itself. The standard defines a day as exactly 86,400 seconds, so leap seconds are simply not represented - which is why Unix time is not quite the same as elapsed physical time since 1970.

Why does my timestamp show a date a day off?

Almost always a time-zone boundary. A timestamp late in the evening UTC falls on the next day in Asia and the previous day in the Americas, so compare the UTC line rather than the local one when you are checking against a server.

How do I get the current timestamp?

The tool shows it live and updating, in both seconds and milliseconds. Copy whichever your system expects - checking the digit count is the reliable way.

What is ISO 8601 and when should I use it?

ISO 8601 is the international standard date format, written as 2026-08-22T14:30:00.000Z, with the Z meaning UTC. Use it whenever a date is stored as text or crosses a system boundary, because unlike a numeric timestamp it is unambiguous to a human reader.

Can I convert a date back to a timestamp?

Yes, the conversion runs both ways. Enter a date and time and the tool returns the corresponding Unix value in both seconds and milliseconds.

Why is the seconds value rounded down?

Converting milliseconds to seconds truncates rather than rounds, which is the Unix convention: a timestamp names the second a moment falls within, so 1.9 seconds past the epoch is second 1.

Is my data sent to a server?

No. All conversion is arithmetic done in your browser, nothing is transmitted and nothing is logged.

Does it work offline?

Yes. Once the page has loaded, conversion works with no network connection.

Why do some APIs return timestamps as strings?

Because JSON numbers are IEEE 754 doubles, and a millisecond timestamp is safely representable but a microsecond or nanosecond one is not. APIs that work at higher precision send the value as a string to avoid silent rounding.

What is the epoch and why 1970?

The epoch is the zero point of Unix time, 00:00:00 UTC on 1 January 1970. It was chosen at Bell Labs as a convenient recent date when the first Unix systems were built, and it stuck - there is no deeper reason than that.

Timestamp Converter

Convert between Unix timestamps and human-readable dates

Current Time

Unix Timestamp:

1788693565

Sunday, September 6, 2026 at 11:19:25 AM UTC

Timestamp → Date

Unix Timestamp (seconds)

Date → Timestamp

Date & Time

Category:misc

Mode:Offline

Version:1.0.0

Access:Free

What is Timestamp Converter?

Timestamp Converter interface on Toolz.dev - Convert between Unix timestamps and human-readable dates

Timestamp Converter is a free online tool that converts between Unix timestamps (epoch time) and human-readable date formats. Unix timestamps represent the number of seconds (or milliseconds) elapsed since January 1, 1970 UTC, and are widely used in programming, databases, and APIs for storing and transmitting date and time information.

The tool supports conversion in both directions: enter a Unix timestamp to see the corresponding date and time, or enter a date to get the Unix timestamp. It displays results in multiple formats including UTC, ISO 8601, your local time zone, and relative time (e.g., "2 hours ago").

Whether you are a developer debugging API responses, a system administrator analyzing log files, or anyone working with timestamps in code, this tool provides instant, accurate conversions. It handles both seconds and milliseconds precision and shows the current Unix timestamp in real-time.

Unix time counts seconds from midnight UTC on 1 January 1970, and two details cause most of the confusion. The first is units: JavaScript, Java and many APIs work in milliseconds while C, PHP, Python and most databases work in seconds, so a value that decodes to 1970 was almost certainly milliseconds read as seconds, and one landing fifty thousand years out is the reverse. The digit count tells you which: ten digits is seconds, thirteen is milliseconds. The second is the 2038 problem. A signed 32-bit integer runs out on 19 January 2038, and any system still storing timestamps that way will wrap to 1901. Unix time also ignores leap seconds by definition, so it is not a count of elapsed physical seconds and never has been.

How to use Timestamp Converter?

Enter a timestamp or date

Type a Unix timestamp (in seconds or milliseconds) to convert to a date, or enter a human-readable date to get the corresponding timestamp.

View the conversion

The tool instantly shows the converted result in multiple formats including UTC, ISO 8601, local time, and relative time.

Check different formats

Review the timestamp in various date formats to find the one you need for your application, database, or API.

Copy the result

Click the copy button next to any format to copy it to your clipboard for immediate use in your project.

Key Features

Seconds and Milliseconds

Both units are read and produced, which is the difference between a date in 1970 and the date you meant when a value crosses between JavaScript and a database

Bidirectional Conversion

Convert Unix timestamps to dates and dates to Unix timestamps in both seconds and milliseconds

Multiple Output Formats

View results in UTC, ISO 8601, local time zone, and relative time formats simultaneously

Live Current Timestamp

See the current Unix timestamp updating in real-time, useful for quick reference during development

Frequently Asked Questions

A Unix timestamp (also called epoch time) is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC. It is a standard way to represent time in computing that avoids time zone and formatting ambiguities.

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Command Palette

Timestamp Converter

Current Time

Timestamp → Date

Date → Timestamp

What is Timestamp Converter?

How to use Timestamp Converter?

Enter a timestamp or date

View the conversion

Check different formats

Copy the result

Key Features

Seconds and Milliseconds

Bidirectional Conversion

Multiple Output Formats

Live Current Timestamp

Frequently Asked Questions

Related Tools

UUID Generator

Cron Expression Generator

Cron Expression Parser

UTM Builder

Comments

Timestamp Converter

Current Time

Timestamp → Date

Date → Timestamp

What is Timestamp Converter?

How to use Timestamp Converter?

Enter a timestamp or date

View the conversion

Check different formats

Copy the result

Key Features

Seconds and Milliseconds

Bidirectional Conversion

Multiple Output Formats

Live Current Timestamp

Frequently Asked Questions

Related Tools

UUID Generator

Cron Expression Generator

Cron Expression Parser

UTM Builder

Comments