Unix Timestamp Converter
Convert a Unix timestamp to a readable date, or a date to a Unix timestamp. The current timestamp is shown live below.
Reviewed by the ToolNestr Editorial Team — July 2026
Timestamp → Date
Local: —
UTC: —
Date → Timestamp
How Unix timestamps work
A Unix timestamp is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC (the Unix epoch). It is a simple, timezone-independent way to represent a moment in time.
The tool converts a timestamp to a human-readable date by creating a JavaScript Date object from the millisecond equivalent. For the reverse conversion, it takes a date and divides its millisecond value by 1000 to get the Unix seconds timestamp.
Worked example
Converting the timestamp 1800000000 to a readable date.
Timestamp usage by scenario
How often developers encounter Unix timestamps in different contexts.
Olivia Park
Backend developer who converts Unix timestamps from database records into readable dates while debugging slow queries and log entries.
Ethan Brooks
DevOps engineer who reads server log timestamps in epoch format and converts them to local time during incident response and root-cause analysis.
Nora Fischer
Data engineer who transforms Unix timestamps in exported datasets into human-readable dates for building reporting dashboards.
Liam O’Connell
Mobile developer who tests API endpoints by generating current timestamps and verifying token expiry logic with future dates.
| Event | Timestamp | Date (UTC) |
|---|---|---|
| Unix epoch | 0 | Jan 1, 1970 |
| Y2K milestone | 946684800 | Jan 1, 2000 |
| iPhone launch | 1189728000 | Sep 14, 2007 |
| COVID-19 pandemic | 1583020800 | Mar 1, 2020 |
| Right now | -- | current |
| Y2038 limit | 2147483648 | Jan 19, 2038 |
How to use the Timestamp Converter
Enter a timestamp or date
Type a 10- or 13-digit Unix timestamp, or pick a date and time using the datetime-local picker.
See the conversion instantly
Timestamps convert to local and UTC dates. Date picker selections convert to a Unix seconds timestamp immediately.
Copy the value you need
Use the Copy button next to the timestamp output to grab the epoch value for use in your code or API test.
Tips for working with Unix timestamps
Seconds vs milliseconds matters
A 10-digit number is interpreted as seconds, a 13-digit number as milliseconds. If your conversion looks wrong (off by decades), check which format your source uses and adjust accordingly.
Use the live counter for quick testing
The current Unix timestamp at the top updates every second. Click to copy it directly — perfect for generating timestamps for API requests or log entries.
Local vs UTC — know the difference
Timestamps are always UTC, but the tool shows both your local time and UTC. Use UTC for cross-timezone communication and local time for readability in your own debugging.
Limitations and considerations for Unix timestamps
The Year 2038 problem
Unix timestamps stored in 32-bit signed integers will overflow on January 19, 2038 at 03:14:08 UTC. When the value exceeds 2,147,483,647, it wraps to a negative number, causing date calculations to fail. Most modern systems use 64-bit integers and are safe, but legacy databases, embedded systems, and older IoT devices may still be vulnerable. If you work with timestamp data from such systems, verifying the bit width of their storage format is essential before relying on the values for critical applications.
Millisecond ambiguity between sources
A 10-digit and a 13-digit number represent completely different dates despite sharing the same leading digits. For example, 1700000000 is November 14, 2023 in seconds, while 1700000000000 is far in the future in milliseconds. This tool uses digit length to distinguish seconds from milliseconds, but not all systems follow this convention. JavaScript's Date.getTime() returns milliseconds, while most Unix APIs return seconds. Always verify your source format before converting to avoid date errors in your application.
Timezone and daylight saving time effects
Unix timestamps are always UTC and do not account for daylight saving time or local timezone offsets. When you view the local time conversion, the tool applies your browser's current timezone settings, which may differ from the timezone in effect when the timestamp was originally recorded. For historical timestamps, the local time shown might not reflect the actual local time observed at that moment if DST rules have since changed in that region.
Precision beyond seconds is not supported
This tool works with second-level and millisecond-level precision. If you need microsecond or nanosecond precision, you will need to handle the fractional part separately. Some databases and logging systems store timestamps as floating-point numbers with fractional seconds, which require special handling during conversion and are not supported by this tool's current implementation.
Frequently asked questions
What is a Unix timestamp?
It’s the number of seconds that have passed since January 1, 1970 (UTC), known as the Unix epoch. It’s a common way to store dates and times in software.
Does it support milliseconds?
Yes. If you paste a 13-digit value it’s treated as milliseconds; a 10-digit value is treated as seconds.
What time zone does it show?
It shows both your local time and UTC, so you can use whichever you need.
Is it private?
Yes, conversions happen entirely in your browser.
What is the "current Unix timestamp" for?
The live counter at the top shows the current epoch time in seconds, updating every second. It’s useful for logging or API testing when you need the current timestamp.
Can I convert dates in the past or future?
Absolutely — the date picker and timestamp input both support any date from 1970 well into the future. There’s no practical limit.
Why does it show different results for the same timestamp?
If you enter a 10-digit number it’s treated as seconds, while a 13-digit number is treated as milliseconds. Make sure you’re using the right format for your use case.
What is the Year 2038 problem?
On January 19, 2038, 32-bit signed Unix timestamps will overflow because the number of seconds since 1970 will exceed 2,147,483,647. Most modern systems use 64-bit integers and are unaffected.
What is the difference between Unix timestamp and ISO 8601?
A Unix timestamp is a single number (seconds since epoch), while ISO 8601 is a human-readable string (e.g. 2026-06-23T12:00:00Z). Both represent the same moment in time.
Can I convert timestamps with timezone offsets?
The tool works in UTC internally and shows both local time and UTC. For timezone-specific conversions, adjust the datetime-local input to your desired time.