Timestamp Converter
Convert Unix timestamps (seconds & ms) to human-readable dates and back.
Timestamp to Date
Date to Timestamp
How to use Timestamp Converter
- 1Enter a Unix timestamp into the converter, or pick a calendar date and time.
- 2Select the timestamp unit: Seconds (10 digits) or Milliseconds (13 digits).
- 3View instant conversions for UTC/GMT, local system timezone, and ISO 8601 formatting.
- 4Click 'Copy' to export the converted date or timestamp directly to your clipboard.
Key Features & Highlights
- •Two-Way Conversion Engine: Convert Unix epoch timestamps to dates, or calendar dates to Unix timestamps instantly.
- •Smart Unit Detection: Auto-detects seconds (10 digits) vs. milliseconds (13 digits) to eliminate off-by-factor-of-1000 errors.
- •Multiple Formatting Standards: Displays ISO 8601, UTC string, and localized system time.
- •Live Epoch Clock: Real-time ticking Unix timestamp display with pause and reset controls.
- •Quick Time Offsets: One-click buttons to add 1 hour, 1 day, 7 days, or 30 days for testing TTLs and expiration windows.
- •100% Client-Side Privacy: All parsing and timezone transformations occur entirely inside your browser.
How Unix Timestamp & Epoch Time Works
The Unix timestamp (also referred to as Epoch time or POSIX time) represents the total number of seconds that have elapsed since midnight (00:00:00 UTC) on January 1, 1970, excluding leap seconds.
Seconds vs. Milliseconds
Languages like C, Python, Go, and PHP traditionally store timestamps in seconds (a 10-digit number like 1700000000). In contrast, JavaScript and Java use milliseconds (a 13-digit number like 1700000000000). A common software bug occurs when milliseconds are passed into a system expecting seconds, resulting in dates tens of thousands of years in the future.
The Year 2038 Problem (Y2038)
Legacy 32-bit systems store timestamps as signed 32-bit integers, which max out at 2,147,483,647 seconds on January 19, 2038. Modern 64-bit architectures and JavaScript numbers prevent this overflow, supporting dates for billions of years.
Frequently Asked Questions
What is a Unix timestamp (Epoch time)?
The Unix timestamp (or POSIX time / Epoch time) represents the total number of seconds that have elapsed since midnight Coordinated Universal Time (UTC) on January 1, 1970 (the Unix Epoch), excluding leap seconds. In modern web development and JavaScript, timestamps are frequently represented in milliseconds (13 digits).
How does the tool know whether my timestamp is in seconds or milliseconds?
A typical Unix timestamp in seconds for modern dates is 10 digits long (e.g. 1,700,000,000 corresponds to late 2023), whereas milliseconds are 13 digits long (e.g. 1,700,000,000,000). Our converter provides both an intelligent auto-detection toggle and explicit manual radio buttons so you have total control over the interpretation.
What is the Year 2038 problem (Y2038)?
On January 19, 2038, 32-bit signed integers will overflow when counting seconds from 1970 (exceeding 2,147,483,647 seconds). Modern 64-bit systems and JavaScript's IEEE 754 floating-point numbers handle dates up to approximately 285,426 years in the future, rendering modern browser applications completely immune to Y2038 overflow.
Can I convert historical dates prior to 1970?
Yes! Dates prior to January 1, 1970 are represented by negative timestamp integers (e.g., -315619200 represents January 1, 1960). BrivTools accurately handles negative timestamps and converts them to valid calendar dates.
Is any date or time calculation logged on a server?
No. All date formatting, parsing, and timestamp conversions execute directly inside your browser's JavaScript engine.
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