Unix Timestamp Converter
Convert Unix timestamps to readable dates and vice versa with timezone support.
Current Unix Timestamp
Convert Date to Unix Timestamp
Convert Unix Timestamp to Date
What is Unix Timestamp?
Unix timestamp (also known as Epoch time) is a system for describing a point in time. It's defined as the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC, minus leap seconds.
Key Features of Unix Timestamp
- Universal: Same timestamp represents the same moment worldwide
- Simple: Just a single integer number
- Precise: Accurate to the second
- Compact: Efficient storage and transmission
- Sortable: Chronological order matches numerical order
Common Use Cases
- Databases: Storing creation and modification times
- APIs: Timestamp parameters in REST APIs
- Logging: System and application log timestamps
- Caching: Cache expiration times
- Authentication: Token expiration times
- Analytics: Event tracking and analysis
Important Milestones
- Epoch Start: 0 = January 1, 1970, 00:00:00 UTC
- Y2K: 946684800 = January 1, 2000, 00:00:00 UTC
- Billion Seconds: 1000000000 = September 9, 2001
- Year 2038 Problem: 2147483647 = January 19, 2038 (32-bit limit)
Programming Examples
- JavaScript: Math.floor(Date.now() / 1000)
- PHP: time() or strtotime('date string')
- Python: import time; time.time()
- Java: System.currentTimeMillis() / 1000
- C++: std::time(nullptr)
Timestamp Formats
- Unix Timestamp: Seconds since epoch (e.g., 1640995200)
- Milliseconds: JavaScript timestamp (e.g., 1640995200000)
- Microseconds: High precision timestamp
- ISO 8601: Human-readable format (e.g., 2022-01-01T00:00:00Z)
Timezone Considerations
- Unix timestamps are always in UTC
- Convert to local time zones for display
- Be aware of daylight saving time changes
- Store timestamps in UTC, display in local time
- Use timezone-aware libraries for calculations
Frequently Asked Questions — Unix Timestamp Converter
A Unix timestamp (also called epoch time) is the number of seconds elapsed since January 1, 1970, 00:00:00 UTC (the "Unix epoch"). It's a universal, timezone-independent way to represent a point in time as a single integer. For example, timestamp 1704067200 represents January 1, 2024, 00:00:00 UTC. Negative timestamps represent times before 1970.
On January 19, 2038, 32-bit signed integers used to store Unix timestamps will overflow (reaching the maximum value of 2,147,483,647). Systems using 32-bit time_t will wrap to a negative number, potentially causing date calculation errors. Modern 64-bit systems can store timestamps until the year 292,277,026,596 — effectively no limit. Most modern systems have already migrated to 64-bit timestamps.
Get current Unix timestamp: JavaScript: Math.floor(Date.now()/1000) or Date.now() for milliseconds. Python: import time; int(time.time()). PHP: time(). Java: System.currentTimeMillis()/1000L. Go: time.Now().Unix(). Bash: date +%s. SQL (MySQL): UNIX_TIMESTAMP(). Note: some systems use millisecond timestamps (JavaScript Date.now()) — divide by 1000 to get seconds.
Unix timestamps are traditionally in seconds. JavaScript's Date.now() and many modern APIs return milliseconds (13 digits). If you see a timestamp around 1,700,000,000 it's in seconds; around 1,700,000,000,000 it's in milliseconds. To convert: divide milliseconds by 1000 to get seconds. This distinction causes frequent bugs when mixing language ecosystems.
Use this tool to convert instantly. Programmatically: JavaScript: new Date(timestamp * 1000).toLocaleString(). Python: datetime.fromtimestamp(timestamp). PHP: date('Y-m-d H:i:s', $timestamp). Always specify a timezone — if omitted, the output uses the system's local timezone, which can differ between servers and cause hard-to-debug issues. Store as UTC, display in user's local timezone.