Unix Timestamp Converter
Convert between Unix timestamps (epoch time) and human-readable dates. Live current timestamp with multiple output formats.
How to Use the Unix Timestamp Converter
- View the current timestamp -- The live display at the top shows the current Unix timestamp, updating every second. Click to copy.
- Timestamp to Date -- Enter a Unix timestamp (in seconds or milliseconds) and click Convert to see the date in UTC, local time, ISO 8601, RFC 2822, and relative time formats.
- Date to Timestamp -- Select a date and time using the input fields, choose whether the input is UTC or local, and click Convert to get the Unix timestamp.
- Copy values -- Click any result card to copy its value to your clipboard.
About Unix Timestamps
A Unix timestamp, also known as epoch time or POSIX time, represents the number of seconds that have elapsed since the Unix epoch: January 1, 1970, at 00:00:00 UTC. This standard is used across virtually all operating systems and programming languages as a simple, unambiguous way to represent a point in time.
Unix timestamps are timezone-independent since they always reference UTC. They are stored as integers, making them efficient for computation, sorting, and storage. Common uses include database timestamps, API responses, log files, and file system metadata. JavaScript uses millisecond-precision timestamps (13 digits), while most other systems use seconds (10 digits). This converter handles both automatically.
Use Cases for Unix Timestamps
Unix timestamps are foundational to computing. Here are the most common scenarios where you need to convert between timestamps and human-readable dates.
Debugging API Responses
Many APIs return dates as Unix timestamps in their JSON responses. When debugging API integrations, you need to quickly convert these numeric values to human-readable dates to verify that events occurred at the expected times. This converter provides instant translation in multiple formats.
Database Queries and Data Analysis
Databases often store dates as Unix timestamps for efficient storage and comparison. When writing queries or analysing data exports, converting between timestamps and calendar dates is essential for filtering by date ranges, creating reports, and understanding when events occurred.
Log File Analysis
Server logs, application logs, and security logs frequently record events with Unix timestamps. Converting these to readable dates helps system administrators and security analysts trace events, correlate incidents across systems, and establish timelines during investigations.
Scheduling and Cron Jobs
When scheduling tasks or setting up cron jobs, you may need to calculate the timestamp for a future date and time. The "Date to Timestamp" mode converts any date into the corresponding Unix timestamp, which can be used in scheduling configurations and time-based triggers.
Cross-Timezone Coordination
Unix timestamps are timezone-independent, making them ideal for coordinating events across time zones. Converting a meeting time in one timezone to a Unix timestamp and sharing that number ensures everyone interprets it correctly regardless of their local timezone.
Epoch Reference Dates
The following table lists notable Unix timestamps for reference and testing.
| Event | Date (UTC) | Timestamp (seconds) |
|---|---|---|
| Unix Epoch | Jan 1, 1970 00:00:00 | 0 |
| 1 Billion Seconds | Sep 9, 2001 01:46:40 | 1,000,000,000 |
| Y2K (Year 2000) | Jan 1, 2000 00:00:00 | 946,684,800 |
| Max 32-bit Signed | Jan 19, 2038 03:14:07 | 2,147,483,647 |
| 2 Billion Seconds | May 18, 2033 03:33:20 | 2,000,000,000 |
| Year 2050 | Jan 1, 2050 00:00:00 | 2,524,608,000 |
The most significant date in this table is the 32-bit overflow on January 19, 2038 -- the "Y2K38 problem". Systems using 32-bit signed integers to store timestamps will overflow on this date, potentially causing date calculations to wrap around to negative values (interpreted as December 1901). Most modern operating systems and programming languages now use 64-bit integers, which extend the range to approximately 292 billion years into the future.
Working with Timestamps in Code
Different programming languages have different conventions for obtaining and formatting Unix timestamps. Here is a quick reference for getting the current timestamp.
| Language | Get Current Timestamp (seconds) | Unit |
|---|---|---|
| JavaScript | Math.floor(Date.now() / 1000) |
Seconds |
| Python | int(time.time()) |
Seconds |
| PHP | time() |
Seconds |
| Java | System.currentTimeMillis() / 1000 |
Seconds |
| Ruby | Time.now.to_i |
Seconds |
| Go | time.Now().Unix() |
Seconds |
Note that JavaScript's Date.now() returns milliseconds by default, which is why you need to divide by 1000 for seconds. Some APIs and databases (notably Elasticsearch and Firebase) also use millisecond timestamps. When in doubt, check the digit count: 10 digits means seconds, 13 digits means milliseconds. This converter handles both automatically.
Best Practices
When working with timestamps in your applications, always store them in UTC. Converting to local time zones should happen only at the display layer, not in the database or business logic. This prevents subtle bugs when your application serves users across multiple time zones or when daylight saving time transitions cause ambiguous local times.
Use 64-bit integers for timestamp storage in any new system. While the 32-bit overflow (Y2K38) is still over a decade away, systems built today may still be running in 2038. PostgreSQL, MySQL 8+, and most modern databases default to 64-bit timestamp storage, but verify this in your schema. If you are using 32-bit systems or embedded devices, plan a migration path.
Be aware of leap seconds. Unix time does not account for leap seconds -- it assumes every day has exactly 86,400 seconds. In practice, UTC occasionally adds a leap second to stay synchronised with the Earth's rotation. This means Unix timestamps occasionally repeat (the same second occurs twice) during a leap second insertion. For most applications this is irrelevant, but high-precision time systems in finance or scientific computing may need to account for it.
Frequently Asked Questions
A Unix timestamp (epoch time) is the number of seconds elapsed since January 1, 1970 00:00:00 UTC. It is the standard way computers track time, used by virtually all operating systems and programming languages.
The Year 2038 problem occurs because many older systems store Unix timestamps as 32-bit signed integers, which will overflow on January 19, 2038 at 03:14:07 UTC. Most modern systems now use 64-bit integers, which won't overflow for billions of years.
Yes. If you enter a timestamp with 13 or more digits, the tool automatically treats it as milliseconds (common in JavaScript). Timestamps with 10 digits are treated as seconds.
The converter displays results in both UTC and your local timezone. Unix timestamps are inherently timezone-independent since they always reference UTC (Coordinated Universal Time).
Unix timestamps in seconds are 10 digits long (e.g., 1700000000) and are the standard in most programming languages and databases. Millisecond timestamps are 13 digits long (e.g., 1700000000000) and are used by JavaScript's Date.now() and some APIs like Elasticsearch. This tool automatically detects the format based on digit count.
The Unix epoch is January 1, 1970 at 00:00:00 UTC. It is the reference point from which all Unix timestamps are counted. A timestamp of 0 corresponds exactly to this moment. Negative timestamps represent dates before the epoch.
In JavaScript: Math.floor(Date.now()/1000). In Python: int(time.time()). In PHP: time(). In Java: System.currentTimeMillis()/1000. In Ruby: Time.now.to_i. In Go: time.Now().Unix(). All return seconds since the Unix epoch.
Yes. Negative timestamps represent dates before the Unix epoch (January 1, 1970). For example, -86400 represents December 31, 1969 at 00:00:00 UTC. Most modern systems support negative timestamps for working with historical dates, though some databases and APIs may not.