Unix Timestamp (also known as POSIX time or Epoch time) is a way of representing time, defined as the total number of seconds (or milliseconds) that have elapsed since 00:00:00 UTC on January 1, 1970.

Because a timestamp is an absolute value unaffected by timezones, it has the same meaning everywhere in the world. This makes it a widely adopted standard for time representation in programming, database storage, and server communication.

Core Features：

• Bidirectional Conversion: Supports converting from timestamp to human-readable datetime, and vice versa—from datetime to timestamp.
• Automatic Unit Detection: The tool automatically identifies whether your input is a 10-digit **second(s)** timestamp or a 13-digit **millisecond(ms)** timestamp based on its length.
• Clear Timezone Display: A timestamp itself does not contain timezone information. For your reference, this tool displays a timestamp in both your **local timezone** and **Coordinated Universal Time (UTC)**.
• Real-time Acquisition: Click the "Get Current Time" button at any time to obtain the precise timestamp of the current moment, useful for testing or logging.