Convert Unix Timestamp to Date Online
Switch between epoch time, UTC, local time and ISO 8601
Accepts seconds (10-digit) or milliseconds (13-digit)
Enter a Unix timestamp or date above, or click Use now to convert the current time
Use this Unix timestamp converter to turn epoch time into readable dates, or convert a date back into Unix seconds and milliseconds. It helps developers, QA engineers, DevOps teams, analysts and students understand raw timestamp values found in logs, APIs, databases, cron jobs, tokens and event data. Instead of guessing whether a number is seconds or milliseconds, you can check the converted UTC time, local time, ISO 8601 format and epoch equivalents in one place. It is especially useful when debugging timezone issues, expiration fields, scheduled tasks and stored event times.
How to Convert Unix Timestamps
Paste a timestamp or pick a date — all formats appear instantly with no button click.
Paste a Unix timestamp
Type or paste your Unix timestamp into the input field. The tool automatically detects whether it is in seconds (10 digits, e.g. 1700000000) or milliseconds (13 digits, e.g. 1700000000000). Click Use now to fill the current timestamp and see what today looks like in each format.
Read all the output formats
Six output rows appear simultaneously: UTC (universal reference time), Local (your browser timezone), ISO 8601 (international standard format such as 2023-11-14T22:13:20Z), Relative (human-friendly description such as 6 months ago), Unix seconds, and Unix milliseconds. Each row has a copy button.
Convert a date back to epoch
Use the date and time picker in the lower section to select any calendar date and time. The corresponding Unix timestamp in seconds and milliseconds appears instantly, ready to copy into your code, database query, or API payload.
Features
Converts Unix timestamps into readable date and time formats
Detects second-based and millisecond-based epoch values
Displays UTC time, local time and ISO 8601 output together
Generates Unix seconds and milliseconds from selected dates
Clarifies timezone differences during API and log debugging
Helps inspect expiry times in tokens, sessions and scheduled jobs
Supports quick timestamp checks for databases and event records
Reduces mistakes caused by 10-digit and 13-digit timestamp confusion
Previews human-friendly relative time for easier review
Copies converted values for code, queries and documentation
What This Tool Helps You Do
Convert raw Unix timestamps into dates you can actually read. A value like 1735689600 may be obvious to a machine, but it is not helpful when you are debugging a log, checking an API response, reviewing a database record or confirming when a token expires.
This converter helps you move between epoch seconds, epoch milliseconds, UTC time, local time and ISO 8601 without writing a quick script every time.
Why Timestamp Format Matters
The most common timestamp mistake is mixing seconds and milliseconds. A 10-digit value usually means seconds. A 13-digit value usually means milliseconds. If you pass milliseconds into a system expecting seconds, the date can become wildly wrong.
Timezone is the second common trap. Unix time itself is UTC-based, but users, browsers, dashboards and logs may display it in local time. When debugging scheduled tasks, compare timestamp output with a cron expression builder so the intended run time is clear.
Practical Ways to Use This Tool
- Convert API timestamp fields into readable dates
- Check whether a stored value is seconds or milliseconds
- Convert a date into epoch time for test requests
- Inspect database event timestamps during debugging
- Translate log times into local and UTC formats
- Check session or token expiry values after using a JWT decoder
- Prepare timestamp examples for documentation
- Verify ISO 8601 output before sharing with a team
- Compare frontend and backend time values during bug fixes
- Confirm whether timezone differences explain unexpected behavior
Expert Tips
Store timestamps in UTC whenever possible, then convert them only for display. Keep seconds and milliseconds clearly labeled in code and database columns. For JavaScript, remember that Date.now() returns milliseconds, while many APIs expect Unix seconds.
If a timestamp appears correct in one system but wrong in another, check timezone display settings before assuming the stored value is bad. For API payloads, use a JSON formatter to inspect where timestamp fields appear in the response.
Common Mistakes to Avoid
- Treating a 13-digit millisecond timestamp as seconds
- Comparing UTC logs with local dashboard times without converting
- Storing local time when the system expects UTC
- Forgetting that JavaScript timestamps are usually milliseconds
- Hardcoding timestamps without documenting the timezone
- Using relative time like “today” in tests that need fixed values
- Ignoring daylight saving changes when displaying local dates
- Assuming ISO 8601 output and Unix time are different moments
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Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp is a numeric value that represents time elapsed since 00:00:00 UTC on January 1, 1970. It is commonly stored in seconds or milliseconds and used in APIs, databases, logs and programming languages.
How do I convert a Unix timestamp to a date?
Paste the timestamp into the converter and review the readable output. Check both UTC and local time because the same timestamp can display differently depending on timezone.
Can this tool convert dates back to Unix time?
Yes. You can select or enter a date and convert it into Unix seconds and milliseconds. This is useful for API parameters, database queries and testing time-based logic.
Does a 10-digit timestamp mean seconds?
Usually yes. Modern 10-digit Unix timestamps are commonly seconds, while 13-digit timestamps are usually milliseconds. Always confirm with the expected date because some systems store custom time formats.
Is Unix time affected by timezone?
The timestamp itself is timezone-neutral and based on UTC. Timezone differences appear only when the timestamp is displayed as a human-readable date.
Why is my converted date off by a few hours?
This usually happens when one system displays UTC and another displays local time. Store timestamps consistently and convert to local time only when presenting dates to users.
When should I use milliseconds instead of seconds?
Use milliseconds when your application needs higher precision or works with JavaScript Date values. Many backend systems and databases still use seconds, so match the format expected by your system.
What is ISO 8601 format used for?
ISO 8601 is a standard readable date-time format often used in APIs, logs and configuration files. It is easier for humans to read than a raw timestamp and still remains machine-friendly.
Can I use this for debugging token expiry?
Yes. Many tokens store expiry values as Unix timestamps. Decode the token first, then convert the exp value to confirm when the token expires.
What should I check before using a timestamp in production?
Check whether the value is seconds or milliseconds, whether the receiving system expects UTC, and whether the displayed time matches the intended timezone. For scheduled jobs, also verify the next actual run time.
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