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Unix Timestamp Converter
A Unix timestamp is a numeric way to represent an instant relative to the Unix Epoch, which begins at 1970-01-01 00:00:00 UTC. TimestampEasy lets you check both common Unix seconds values and millisecond values, then compare the result in UTC, your browser timezone and ISO 8601 format.
Seconds and milliseconds are different units
Many Unix-oriented APIs use whole seconds, while JavaScript and several web APIs commonly use milliseconds. A seconds timestamp around the present era is often 10 digits; a millisecond value is often around 13 digits. Digit length is only a clue, so the safest approach is to confirm the unit documented by the source system.
| Representation | Typical scale | Example |
|---|---|---|
| Unix seconds | Seconds since 1970-01-01 UTC | 1767225600 |
| Unix milliseconds | Milliseconds since 1970-01-01 UTC | 1767225600000 |
What TimestampEasy shows
- Readable local date and time.
- UTC date and time for a timezone-neutral reference.
- ISO 8601 output for APIs and logs.
- Unix seconds and milliseconds so you can compare units.
- Timezone-aware conversion using your browser's time data.
Common timestamp mistakes
The most common problem is feeding seconds into a millisecond API or the reverse. Another is formatting a timestamp in local time when the receiving system expects UTC. When debugging a log, API response or database value, check the documented unit first, then check the timezone used for display.
Negative timestamps are also valid for dates before the Unix Epoch in many systems. They should not automatically be treated as invalid simply because they are less than zero.
Useful workflows
API debugging
Paste the numeric value and verify the instant in UTC before comparing it with logs.
Database checks
Compare stored epoch values with a human-readable date and confirm the unit used by the schema.
Frontend work
Check whether a JavaScript value uses milliseconds before converting it to Unix seconds.
Related Timestamp Tools
A dependable timestamp debugging workflow
When a timestamp comes from an unfamiliar system, avoid changing the number until you know what it represents. Start with the field name or API documentation, record the unit, and identify whether the original value is intended to represent an exact instant. Then convert it and compare the readable UTC result with an event whose time you already know. This approach is more reliable than guessing from whether the number looks like 10 or 13 digits.
| Step | What to check |
|---|---|
| 1. Source | Which application, API, database, or log produced the value? |
| 2. Unit | Seconds, milliseconds, microseconds, or another scale? |
| 3. Instant | Does the converted UTC time match the known event? |
| 4. Display | Is a local timezone being applied after the instant is identified? |
| 5. Storage | Can the target language or database represent the required range? |
Why showing both raw and readable values helps
A raw timestamp is compact and easy for software to compare, but it is difficult for a person to inspect. A readable ISO 8601 value makes the same instant much easier to verify during debugging. Keeping both forms visible is particularly useful when investigating API payloads, log ordering, scheduled jobs, database records, and frontend events. If two systems disagree, compare the raw unit first and then compare their timezone displays.
When a timestamp is not the right storage format
Unix time is a good representation of an exact instant, but some business rules are about a local calendar date rather than an instant—for example, a store opening date or a recurring local appointment. In those cases, storing only a Unix timestamp can hide important timezone or calendar intent. Choose a representation that matches the meaning of the data, and use Unix time where an exact moment is what the application needs.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp represents an instant relative to the Unix Epoch starting at 1970-01-01 00:00:00 UTC.
How do I know whether a value is seconds or milliseconds?
Check the API or database documentation first. Around the current era, Unix seconds are often about 10 digits and milliseconds about 13 digits, but digit length alone is not a specification.
Does TimestampEasy require an account?
No. The timestamp tools are designed to run in the browser without requiring an account.