Convert Unix timestamps to human-readable dates and back. See results in UTC, your local timezone, and ISO 8601 -- all processed in your browser with nothing sent to a server.
| Event | Timestamp | Date (UTC) |
|---|---|---|
| Unix Epoch | 0 | Jan 1, 1970 00:00:00 |
| Billennium | 1000000000 | Sep 9, 2001 01:46:40 |
| Y2K | 946684800 | Jan 1, 2000 00:00:00 |
| 1.5 Billion | 1500000000 | Jul 14, 2017 02:40:00 |
| 2 Billion | 2000000000 | May 18, 2033 03:33:20 |
| Max 32-bit (Y2K38) | 2147483647 | Jan 19, 2038 03:14:07 |
| Max 32-bit unsigned | 4294967295 | Feb 7, 2106 06:28:15 |
A Unix timestamp (also called epoch time or POSIX time) counts the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC. This single integer is the standard way computers track time -- every operating system, programming language, and database understands it. When you see a value like 1700000000, that maps to a precise moment: November 14, 2023 at 22:13:20 UTC.
Timestamps avoid timezone ambiguity entirely. A value of 1700000000 means the same instant whether you read it in New York, Tokyo, or London. They sort naturally as integers, take minimal storage (4 or 8 bytes), and compare with simple math -- subtract two timestamps and you get the exact number of seconds between events. This makes them ideal for log files, API responses, database records, and cron scheduling.
Most systems store Unix time in seconds (10 digits for dates between 2001 and 2286). JavaScript and Java use milliseconds (13 digits), so you may need to divide by 1000 to get a standard Unix timestamp. This converter handles both -- if you enter a 13-digit number, it recognizes you likely mean milliseconds and converts accordingly.
Systems that store Unix time in a signed 32-bit integer will overflow on January 19, 2038 at 03:14:07 UTC, when the timestamp reaches 2,147,483,647. After that, the value wraps to a negative number, causing the date to jump back to December 13, 1901. Most modern systems have moved to 64-bit integers, which pushes the overflow date more than 292 billion years into the future. If you work with embedded systems or legacy codebases, the 2038 problem is worth auditing.
Math.floor(Date.now() / 1000). In Python: import time; int(time.time()). In Bash: date +%s.new Date(timestamp * 1000). In Python: datetime.utcfromtimestamp(ts).A Unix timestamp is a single integer representing the number of seconds since January 1, 1970, 00:00:00 UTC -- an instant known as the Unix epoch. Every major programming language and operating system uses this format internally, which makes it the universal way to record when an event occurred. Because it is timezone-neutral, the same number maps to the same moment everywhere in the world.
Paste the numeric timestamp into the converter above and click Convert. You will immediately see the corresponding date and time in UTC, your local timezone, and ISO 8601 format. If you are working in code, multiply the timestamp by 1000 (to get milliseconds) and pass it to your language's Date constructor -- for example, new Date(ts * 1000) in JavaScript or datetime.utcfromtimestamp(ts) in Python.
A 13-digit timestamp is in milliseconds rather than seconds. JavaScript's Date.now() and Java's System.currentTimeMillis() both return millisecond precision. To convert to a standard 10-digit Unix timestamp, divide by 1000 and drop the decimal. This converter detects 13-digit inputs automatically and handles the conversion for you so you always get the correct date.
The Year 2038 problem affects systems that store Unix time in a signed 32-bit integer. The maximum value a signed 32-bit integer can hold is 2,147,483,647, which corresponds to January 19, 2038 at 03:14:07 UTC. One second later the value overflows to a negative number, making the system interpret the date as December 13, 1901. Modern 64-bit systems are not affected -- their integer range extends billions of years. If you maintain legacy 32-bit systems, embedded devices, or file formats with 32-bit timestamps, you should plan a migration before 2038.
Yes. This converter runs entirely in your browser using JavaScript. No data is transmitted to any server -- there are no API calls, no cookies, and no logging. You can verify this by opening your browser's developer tools and checking the Network tab while using the tool. It is safe to convert timestamps from logs, databases, or any other source without privacy concerns.
Yes. Negative Unix timestamps represent dates before the epoch -- before January 1, 1970. For example, -86400 corresponds to December 31, 1969. This converter accepts negative values and will display the correct pre-1970 date in UTC, local time, and ISO 8601 format.