What is a Unix Timestamp?
A Unix timestamp (also known as Epoch time or POSIX time) is a system for tracking time as a running count of seconds. It represents the number of seconds that have elapsed since 00:00:00 UTC on January 1, 1970, not counting leap seconds.
Unix timestamps are timezone-independent and are widely used in programming, databases, and APIs for storing and comparing dates and times.
How to Use This Timestamp Converter
- Paste a Unix timestamp (seconds or milliseconds) into the input field.
- View the converted date in UTC, local time, and ISO 8601 format instantly.
- Alternatively, pick a date and time to generate the corresponding epoch value.
- Watch the live clock section to copy the current timestamp in your preferred format.
Worked Example
A log file shows the Unix timestamp 1735200000. Here is what it means:
Input (Unix seconds)
1735200000Human-readable (UTC)
2024-12-26T08:00:00.000ZIf you accidentally treat that value as milliseconds, you get a date in January 1970 â a classic debugging mistake this tool helps you catch immediately.
Common Use Cases
đī¸ Database Storage
Store dates and times in a compact, timezone-independent format.
đ API Communication
Exchange date/time information between systems without timezone confusion.
đ Data Analysis
Perform time-based calculations and comparisons easily with numeric values.
đ Debugging
Convert timestamps in logs to human-readable dates for troubleshooting.
Timestamp Formats
Unix Seconds
10-digit number representing seconds since the Unix epoch. Example: 1735200000
Unix Milliseconds
13-digit number representing milliseconds since the Unix epoch. Example: 1735200000000
ISO 8601
International standard for date and time representation. Example: 2026-04-26T12:00:00.000Z
Frequently Asked Questions
What is the Unix epoch?
The Unix epoch is January 1, 1970 at 00:00:00 UTC. Every Unix timestamp counts seconds (or milliseconds) forward from that moment.
How do I tell seconds from milliseconds?
Unix seconds are 10 digits (valid through year 2286). Millisecond timestamps are 13 digits. JavaScript's Date.now() returns milliseconds.
Are timestamps affected by timezones?
The stored value is always UTC-based. Your local timezone only affects how the date is displayed, not the underlying epoch number.
What is ISO 8601 format?
ISO 8601 is a standardized string like 2026-04-26T12:00:00.000Z. The trailing Z means UTC. APIs commonly use this format in JSON responses.
Is my timestamp data sent anywhere?
No. All conversions run locally in your browser with no server uploads.
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Why Use Our Timestamp Converter?
đ Real-Time
See the current timestamp updated every second in multiple formats.
đ Bidirectional
Convert from timestamps to dates or dates to timestamps seamlessly.
đ Multiple Formats
Get results in Unix, ISO 8601, UTC, and local time formats instantly.