⏱️ Epoch Converter
Convert between Unix timestamps and human-readable dates instantly.
What is this tool?
The Epoch Converter is a free online tool for converting between Unix epoch timestamps and human-readable date formats. The Unix epoch counts the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC, not counting leap seconds. This timestamp format is the backbone of modern computing, used by operating systems, databases, APIs, log files, and programming languages worldwide. This tool supports bidirectional conversion with both seconds and milliseconds precision. Enter a Unix timestamp to see the corresponding date and time in both UTC and your local time zone, or enter a date to get its epoch value. Whether you are debugging server logs, working with REST API responses, or analyzing system events, this converter handles timestamps from the past and future with full accuracy, including the Year 2038 problem boundary for 32-bit systems.How it works
The tool uses JavaScript's Date object, which internally stores time as the number of milliseconds since the Unix epoch. For timestamp-to-date conversion, the input value (in seconds or milliseconds) is passed to the Date constructor, and the resulting Date object is formatted using both toISOString() for UTC display and toLocaleString() for local time display. For date-to-timestamp conversion, the input date and time are parsed into a Date object, and the getTime() method returns the millisecond value. The tool divides by 1000 to provide seconds precision. The Unix epoch starting point of January 1, 1970 00:00:00 UTC corresponds to timestamp 0. Negative timestamps represent dates before the epoch. JavaScript handles timestamps as 64-bit floating-point numbers, so the tool works correctly far beyond the Year 2038 limit that affects 32-bit integer systems.How to use
- Choose the conversion mode: Timestamp to Date, or Date to Timestamp.
- For Timestamp mode: enter the Unix timestamp (seconds or milliseconds).
- For Date mode: enter the date and time in the picker.
- Click Convert to get the result instantly.
- View both UTC and local time zone results for full context.
Frequently Asked Questions
Frequently Asked Questions
What is the Unix epoch?
It is January 1, 1970 at 00:00:00 UTC. All Unix timestamps count seconds from this moment.
What is the Year 2038 problem?
On January 19, 2038, 32-bit signed integer timestamps will overflow. 64-bit systems and JavaScript are not affected.
How do I know if my timestamp is in seconds or milliseconds?
A 10-digit number is seconds. A 13-digit number is milliseconds. This tool auto-detects based on the number length.
Can I convert timestamps before 1970?
Yes. Negative timestamps represent dates before the epoch. For example, -1 equals December 31, 1969 at 23:59:59 UTC.
Tips & Advice
When working with timestamps from different systems, always verify the unit: JavaScript uses milliseconds, most Unix tools use seconds, and some APIs use microseconds. A common mistake is treating seconds as milliseconds (or vice versa), resulting in dates in 1970 or far in the future. For logging and data storage, Unix timestamps are ideal because they are timezone-independent, sortable as numbers, and unambiguous. Always store timestamps in UTC to avoid timezone-related bugs.