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Unix Timestamp Converter

Convert Unix epoch timestamps to human-readable dates (UTC, Local, ISO 8601, Relative) and convert dates to epoch timestamps instantly.

Current Unix Epoch Time
1700000000seconds|1700000000000ms

1. Timestamp to Human Date

Epoch → Date
Auto-detected: Seconds
Force unit:
Quick Presets
Relative TimeJust now
ISO 8601 (UTC)--
UTC String (GMT)--
Your Local Time--
Day of Week--
Day of Year--
ISO Week Number--
Leap Year?--

2. Date to Unix Timestamp

Date → Epoch
Quick Presets
Unix Timestamp (Seconds)--
Unix Timestamp (Milliseconds)--
ISO 8601:--
UTC String:--
Local String:--

What is a Unix Timestamp?

A Unix timestamp (also known as Epoch time or POSIX time) is a system for describing a point in time. It is defined as the number of seconds that have elapsed since January 1, 1970, at 00:00:00 UTC, minus leap seconds. This seemingly arbitrary starting point is known as the Unix Epoch.

Developers universally rely on Unix timestamps because they provide a standardized, absolute way to track time independent of time zones or geographical locations. Storing dates as a single integer makes it incredibly efficient for databases to sort, index, and query records. It also eliminates the complexity of parsing various date formats across different programming languages and API responses. Whether a user is in Tokyo or New York, the Unix timestamp for a given moment is exactly the same, ensuring cross-timezone consistency.

Timestamps are typically represented as either 10-digit integers (seconds) or 13-digit integers (milliseconds, standard in JavaScript). A known limitation of the 32-bit timestamp format is the "Year 2038 problem", where the integer capacity will overflow. However, modern systems now use 64-bit integers, pushing the overflow limit billions of years into the future.

Using SnipTools for timestamp conversion offers a strict privacy advantage: all conversions are processed securely in your local browser. Your data inputs are never transmitted to or stored on an external server, keeping your workflow fast and completely private.

How to Use the Unix Timestamp Converter

1

Convert Timestamp to Date

Enter any 10-digit (seconds) or 13-digit (milliseconds) Unix timestamp into the input box. SnipTools instantly computes the ISO 8601 string, UTC format, local timezone date, and relative time.

2

Convert Date to Timestamp

Use the date-time picker or click any quick preset button (such as "Now" or "Today 00:00"). The converter will output both the 10-digit seconds timestamp and 13-digit milliseconds timestamp.

3

Copy Results & Shortcuts

Click any "Copy" button to instantly copy the value to your clipboard. Use keyboard shortcuts or quick preset buttons for maximum speed while debugging APIs or databases.

Frequently Asked Questions

Q: What is a Unix timestamp?

A Unix timestamp (also known as Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC (excluding leap seconds).

Q: How can I tell if a timestamp is in seconds or milliseconds?

10-digit timestamps (e.g., 1700000000) are in seconds, whereas 13-digit timestamps (e.g., 1700000000000) are in milliseconds. SnipTools automatically detects and handles both formats.

Q: What is the Year 2038 problem (Y2K38)?

On January 19, 2038 at 03:14:07 UTC, 32-bit signed integer timestamps will overflow. Modern systems use 64-bit integers to represent Unix timestamps safely for billions of years into the future.

Q: Does this tool upload my date inputs to a server?

No. All timestamp conversions occur 100% locally in your web browser using JavaScript's native Date object. Your data never leaves your device.

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