Unix Timestamp Converter

Convert Unix timestamps to dates and back, instantly in your browser.

10-digit numbers are read as seconds, 13-digit as milliseconds.

Local time
UTC
ISO 8601
Relative
Unit

Unix seconds
Unix milliseconds
Ready. Enter a timestamp or pick a date.

Your input is converted in your browser. Nothing is uploaded to BroBroGo.

FAQ

Is it safe to paste a timestamp here?

Yes. The conversion happens entirely in your browser — nothing is sent to BroBroGo.

How does it know if my timestamp is in seconds or milliseconds?

By magnitude: a 10-digit value is treated as seconds, a 13-digit value as milliseconds — the same convention every epoch converter uses, since a seconds timestamp that large would be centuries in the future.

What timezone are the results shown in?

Local uses your device's own timezone, while UTC and ISO 8601 are always Coordinated Universal Time, regardless of where you are.

Written and reviewed by the BroBroGo editorial team.Last updated:

Understanding Unix Time and the Epoch

Unix time is a system for tracking points in time by counting the elapsed duration since a predefined starting point. This starting point is known as the Unix epoch, which is defined as midnight on January 1, 1970, Coordinated Universal Time (UTC).

Unlike calendar systems that track years, months, days, and hours, Unix time simplifies temporal tracking into a single, continuously increasing number. The system can convert epoch 0, which corresponds exactly to the Unix epoch of 1970-01-01T00:00:00Z.

This numerical representation is widely used in computing because computers can perform mathematical operations, sorting, and storage tasks much faster on single numbers than on complex, formatted date strings.

Seconds versus Milliseconds in Timestamps

Unix timestamps are typically represented in either seconds or milliseconds. The difference in scale is critical when parsing timestamp data, as treating a millisecond value as seconds (or vice versa) results in massive calculation errors.

The Unix Timestamp Converter automatically distinguishes between these two units based on the magnitude of the input value:

  • Seconds: A 10-digit value is treated as seconds. For example, the 10-digit input 1700000000 represents a timestamp in seconds.
  • Milliseconds: A 13-digit value is treated as milliseconds.

This automatic detection relies on the standard convention that a 10-digit timestamp represents seconds, whereas a 13-digit timestamp represents milliseconds. This convention is reliable because a seconds-based timestamp of 13 digits would point to a date thousands of years in the future.

Timezones and Standard Formats

When converting a raw Unix timestamp into a human-readable format, timezones dictate how the resulting date and time are displayed. A single Unix timestamp represents a global instant in time, but it translates to different hours depending on geographic location.

The converter outputs three distinct representations of time to accommodate different needs:

  • Local time: This is the converted date and time displayed in your device's local timezone. It is interpreted and shown based on the specific timezone settings of your operating system or browser.
  • UTC: Coordinated Universal Time is the primary time standard by which the world regulates clocks and time. The UTC output is always shown in Coordinated Universal Time, regardless of your physical location or device settings.
  • ISO 8601: This is an international standard for date and time representation. The ISO 8601 output is always displayed in Coordinated Universal Time, providing a standardized, unambiguous string format (such as YYYY-MM-DDTHH:mm:ssZ) that is easily parsed by databases and software systems.

Practical Applications of Unix Timestamps

Unix timestamps are foundational to modern software development, system administration, and database management. Some of the most common practical applications include:

  • System Logs and Debugging: Operating systems, web servers, and applications write events to log files using Unix timestamps. Converting these numbers into human-readable dates is essential for troubleshooting, auditing, and analyzing system behavior.
  • Database Storage: Storing dates as integers (Unix timestamps) reduces storage space and speeds up indexing and query performance. Developers use converters to translate these database values back into readable formats during debugging.
  • API Integration: Many web APIs transmit date and time information as Unix timestamps to avoid timezone confusion between servers and clients.
  • Relative Time Calculations: By comparing a stored timestamp to the current time, applications can calculate relative time expressions, such as "just now", to show how recently an action occurred.

Browser-Based Processing and Privacy

The Unix Timestamp Converter operates directly in your web browser. When you enter a timestamp or select a date, the conversion calculations are executed locally by your device's browser engine.

Your input is converted entirely within your browser; nothing is uploaded to BroBroGo. This local processing model ensures that your data remains on your machine.

How to Use the Converter

The tool provides a bidirectional interface to convert timestamps to dates, or dates to timestamps.

Converting a Timestamp to a Date

  1. Enter a whole number representing seconds or milliseconds into the Unix timestamp field.
  2. The tool automatically detects the Unit as either Seconds or Milliseconds based on the length of the input.
  3. The tool instantly displays the converted values in the following output fields:
    • Local time
    • UTC
    • ISO 8601
    • Relative (e.g., just now)
    • Unix seconds
    • Unix milliseconds
  4. You can click any output value to copy it directly to your clipboard.

Converting a Date to a Timestamp

  1. Select a date and time using the Date & time calendar interface.
  2. The tool will instantly generate and display the corresponding Unix seconds and Unix milliseconds.

Additional Controls

  • Use current time: Click the "Use current time" button to instantly load the current system time as your input.
  • Clear: Click the "Clear" button to reset all input fields and hide the results.

Error Handling

  • If you enter non-numeric characters or an invalid timestamp format, the results are hidden, and the tool displays the message: "Not a valid timestamp — enter a whole number of seconds or milliseconds".
  • If you enter a number that is out of range for a valid date conversion, the tool displays the message: "That number is out of range for a valid date".

Frequently Asked Questions

Is it safe to paste a timestamp here?

Yes. The conversion happens entirely in your browser — nothing is sent to BroBroGo.

How does it know if my timestamp is in seconds or milliseconds?

By magnitude: a 10-digit value is treated as seconds, a 13-digit value as milliseconds — the same convention every epoch converter uses, since a seconds timestamp that large would be centuries in the future.

What timezone are the results shown in?

Local uses your device's own timezone, while UTC and ISO 8601 are always Coordinated Universal Time, regardless of where you are.

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