What is Unix Epoch time?

Unix Epoch time (or Unix timestamp) counts the number of seconds elapsed since January 1, 1970, 00:00:00 UTC. This date is known as the Unix Epoch and serves as the universal reference point for time representation in computing systems.

How do I know if my timestamp is in seconds or milliseconds?

The tool automatically detects the unit based on the number of digits. A 10-digit number is interpreted as seconds, a 13-digit number as milliseconds, and a 16-digit number as microseconds. You can also see the auto-detected unit displayed below the input field.

What is the Y2038 problem?

The Y2038 problem occurs because 32-bit systems store timestamps as a signed 32-bit integer, which overflows on January 19, 2038 at 03:14:07 UTC. After this point, the timestamp wraps to a negative number. Modern 64-bit systems are immune to this issue.

Why do APIs use Unix timestamps instead of date strings?

Unix timestamps are timezone-independent, language-neutral, and easy to compare mathematically. They avoid ambiguity from different date formats (MM/DD vs DD/MM), daylight saving time complications, and locale-specific formatting differences.

Can I convert negative timestamps?

Negative timestamps represent dates before January 1, 1970. For example, -86400 represents December 31, 1969. The converter supports negative values, though some edge cases may vary depending on the target timezone.

Unix Timestamp Converter - Epoch Time to Date | Free Online Tool

Timestamp Input

Timezone

What is Unix Timestamp?

Unix timestamp (Epoch Time) is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC.

It is a standard way to store and process date/time in most programming languages and databases.

Timestamp Units

Seconds (10 digits): 1738150800

1738150800

Milliseconds (13 digits): 1738150800000

1738150800000

Microseconds (16 digits): 1738150800000000

1738150800000000

Y2038 Problem

32-bit systems may experience timestamp overflow after January 19, 2038. Using 64-bit systems is recommended.

What is Timestamp Converter?

Timestamp Converter is a developer utility that converts between Unix timestamps (Epoch time) and human-readable date/time formats. It supports seconds, milliseconds, and microseconds precision with automatic unit detection. The tool displays results in multiple formats including ISO 8601, RFC 2822, and local time, along with timezone conversion across 9 major time zones. It also provides ready-to-use code snippets in 7 programming languages to help developers integrate timestamp handling into their projects.

Bidirectional conversion between Unix timestamps and human-readable dates
Automatic detection of timestamp units (seconds, milliseconds, microseconds)
Multiple output formats: ISO 8601, RFC 2822, local format, relative time
Timezone conversion across 9 major world time zones
Code snippets in 7 languages: JavaScript, Python, Java, Go, PHP, Ruby, C#
Live current Unix timestamp display

How to Use

1
Choose input mode
Select either Timestamp Input to convert a Unix timestamp to a date, or Date/Time Input to convert a date to a Unix timestamp.
2
Enter your value
For timestamp mode, enter a numeric Unix timestamp (the tool auto-detects whether it is in seconds, milliseconds, or microseconds). For date/time mode, select a date and time using the date picker.
3
Select timezone
Choose the relevant timezone from the dropdown. The tool supports UTC and 8 major city time zones including Seoul, Tokyo, New York, London, and more.
4
View conversion results
Review the converted values displayed in multiple formats. Click the copy button next to any result to copy it to your clipboard.
5
Use code snippets
Expand the Code Snippets section to see how to work with timestamps in your preferred programming language, with ready-to-copy examples.

Frequently Asked Questions

Tips & Best Practices

Always store timestamps in UTC and convert to local time only for display — this avoids timezone-related bugs.
Use millisecond-precision timestamps (13 digits) when you need sub-second accuracy, which is common in JavaScript and modern APIs.
Be aware of the Y2038 problem when working with legacy 32-bit systems — use 64-bit integers for future-proof timestamp storage.
When comparing timestamps across systems, verify that both use the same unit (seconds vs. milliseconds) to avoid off-by-1000x errors.
Use ISO 8601 format (e.g., 2025-01-29T15:00:00Z) for human-readable date strings in APIs, as it is unambiguous and internationally recognized.
The 'Now' button is useful for quickly capturing the current timestamp during debugging or logging.