Epoch / Unix Timestamp Converter
Convert between Unix Epoch timestamps (seconds and milliseconds) and standard human-readable calendar dates. Processes entirely client-side.
Epoch to Human Date
Human Date to Epoch
What is Unix Epoch Time?
Defining the Unix Time System
Unix time (also known as Epoch time or POSIX time) is a system for tracking calendar times by counting the number of elapsed seconds since the **Unix Epoch** (January 1, 1970, at 00:00:00 UTC). It accumulates continuously, ignoring leap seconds. This flat numerical count is extremely useful in computer programming, APIs, and databases for sorting logs and timing session expirations.
Seconds vs. Milliseconds
Many software frameworks handle time in seconds (10-digit Unix timestamp). However, JavaScript and other platform environments execute timestamps at sub-second precision, measuring in milliseconds (13-digit Unix timestamp). Our converter checks the input length to parse both formats.
How to Use Timestamp Converter
Input Timestamp or Date
Enter a Unix epoch timestamp (e.g. 1769948400) or pick a calendar date and time.
Automatic Unit Detection
The parser auto-detects seconds vs milliseconds and updates conversions in real-time.
Multi-Format Output
View ISO 8601, UTC/GMT, local time zone, and relative time representations.
Copy Formatted Date
Copy converted timestamp values or date strings to clipboard.
Key Features & Capabilities
- Bi-directional Epoch-to-Date & Date-to-Epoch conversion
- Automatic seconds vs milliseconds detection
- ISO 8601, UTC, GMT & Local Timezone outputs
- Live ticking current Unix time clock widget
- 100% private offline browser execution
100% Client-Side Privacy: All operations occur locally in your web browser memory using JavaScript and WebAssembly. Your files, text payloads, and images are never uploaded to external servers or stored in cloud databases.
Frequently Asked Questions
View All Platform FAQsWhat is a Unix epoch timestamp?
Unix time (or POSIX time) tracks time as the total number of seconds that have elapsed since January 1, 1970 00:00:00 UTC (excluding leap seconds).
How do I distinguish between seconds and milliseconds timestamps?
Timestamp values with 10 digits (e.g. 1769948400) represent seconds. Timestamp values with 13 digits (e.g. 1769948400000) represent milliseconds (commonly used in JavaScript `Date.now()`).
Experiencing an issue with Unix Timestamp Converter?
Notice a bug, calculation error, or unexpected result? Let us know.