About Unix Timestamp Converter
The Unix Timestamp Converter translates Unix epoch values to readable dates and back, entirely in your browser.
A live ticking counter shows the current Unix timestamp in seconds. Enter any timestamp in the first section and click Convert — the tool auto-detects whether it's in seconds, milliseconds, microseconds, or nanoseconds, then shows the equivalent GMT date, your local timezone date with offset, and a human-readable relative time like '3 hours ago' or 'in 2 days'.
The second section goes the other direction: fill in year, month, day, hour, minute, and second fields, toggle whether to treat them as UTC or local time, and convert to get the Unix timestamp in all four precisions.
A quick-reference strip lets you click any notable timestamp — the Unix epoch (0), Y2K, the 32-bit overflow date (2038), or the current second — and instantly decode it.
All conversion runs locally. Nothing is sent to a server.
Unix Timestamp Converter Features
- Runs entirely in your browser
Unix Timestamp Converter processes everything client-side — nothing you paste, type, or upload is sent to a server.
- Free, instant, no sign-up
No account, no usage limits, no paywall. Results update as you type or click.
- Decode epoch time to a human date — or convert a date to a timestamp
The Unix Timestamp Converter translates Unix epoch values to readable dates and back, entirely in your browser.
How to Use Unix Timestamp Converter
To decode a timestamp: paste it into the first field and click Convert. Leave it blank to decode the current time.
The result table shows GMT, your local timezone with offset, and relative time.
To encode a date: fill in the date/time fields in the second section, choose UTC or local, and click Convert.
Use the quick-reference buttons to instantly decode notable timestamps like the Unix epoch or Y2K.
Examples
Practical Uses for Unix Timestamp Converter
- Decode a timestamp found in an API response or database record
- Check when a JWT token was issued or will expire
- Convert a log file's Unix timestamps to readable dates for a report
- Generate a Unix timestamp for a scheduled task's start time
- Check if a timestamp is in seconds or milliseconds before parsing it in code
- Convert a specific date and time to a timestamp for an API request
Who Uses the Unix Timestamp Converter Tool
- Developers decode Unix timestamps found in API responses, database records, and log files.
- Backend engineers convert between dates and timestamps when building scheduled tasks or API requests.
- Data analysts convert epoch timestamps in exported data to readable dates for reporting.
- DevOps engineers check timestamps in log files during debugging and incident investigation.
- QA engineers verify timestamp fields in API responses match expected dates and times.
Comparisons
Unix Timestamp vs ISO 8601 Date
A Unix timestamp is a single number representing seconds (or milliseconds) since January 1, 1970 — compact and easy for computers to compare and sort, but not human-readable and dependent on knowing which precision is being used.
An ISO 8601 date (like 2024-01-15T09:30:00Z) is human-readable and includes explicit timezone information, making it the preferred format for APIs and logs meant to be read by people. Many systems store timestamps internally as Unix time but display or exchange them as ISO 8601 strings — this tool converts between the two.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp is the number of seconds (or milliseconds, microseconds, or nanoseconds) that have elapsed since 00:00:00 UTC on January 1, 1970 — called the Unix epoch. It is the most common way to represent a specific moment in time across programming languages and systems.
How does the tool know whether my timestamp is in seconds or milliseconds?
By magnitude. Timestamps under 10 digits are seconds; 10–12 digits are milliseconds; 13–15 digits are microseconds; 16+ digits are nanoseconds. This covers all realistic dates between 1970 and ~2100.
What is the Unix 2038 problem?
32-bit signed integers can only store values up to 2,147,483,647. That corresponds to January 19, 2038 at 03:14:07 UTC. Systems using 32-bit timestamps will overflow on that date. Most modern systems use 64-bit timestamps, which extend the range by billions of years.
What is the difference between UTC and GMT?
For practical purposes they are the same — both represent time at 0° longitude with no daylight-saving offset. UTC (Coordinated Universal Time) is the modern international standard; GMT (Greenwich Mean Time) is the historical predecessor. They differ by at most 0.9 seconds.
Does 'local time' mean my browser's timezone?
Yes. The tool reads your browser's timezone (via Intl.DateTimeFormat) and displays the equivalent local time with the UTC offset.
How do I check when a JWT token expires?
Decode the JWT with the JWT Decoder tool first to find the exp claim's numeric value, then paste that number here to see the exact expiration date and time in your local timezone.
Why does my timestamp look wrong by exactly one factor of 1000?
This usually means the timestamp is in a different precision than expected — many APIs use seconds while JavaScript's Date.now() returns milliseconds. This tool auto-detects the precision based on digit count.
Can I convert a specific date to a timestamp for an API request?
Yes — use the second section to enter the date and time, choose UTC or local, and get the corresponding Unix timestamp in seconds, milliseconds, microseconds, and nanoseconds.
Related Tools
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