Timestamp Converter Tutorial
Detailed guide, best practices, and FAQ
Use Cases
The timestamp converter is useful for backend API debugging, database record queries, log analysis, cross-timezone time calculations, and cron job configuration. Use it to convert Unix timestamps to readable times or to get the current timestamp.
Features
- Real-time display: current timestamp and time update live
- Bidirectional: timestamp ↔ date-time
- Seconds/milliseconds: supports both second and millisecond timestamps
- Local timezone: automatically uses browser timezone
- One-click copy: results can be quickly copied
Examples
Example 1: Scenario 1: Backend API returns `created_at: 1719500000` — paste it in to instantly see the readable time.
Example 2: Scenario 2: Database logs show `2024-06-27 15:30:00` and you need the timestamp to calculate time differences.
Example 3: Scenario 3: Configure a cron job and need the timestamp for a future point in time — enter the date-time to get it.
Best Practices
- Distinguish between second and millisecond timestamps (13 digits usually means milliseconds)
- For cross-timezone scenarios, store UTC timestamps uniformly and convert to local timezone on display
- Historical timestamps (before 1970) may be inaccurate in JavaScript
- Year 2038 problem: 32-bit Unix timestamps will overflow in 2038 — use 64-bit systems
FAQ
What is a timestamp?
A Unix timestamp is the number of seconds (or milliseconds) elapsed since 1970-01-01 00:00:00 UTC. It is a universal, cross-platform, cross-timezone time representation.
How do I distinguish second vs millisecond timestamps?
Typically 10-digit numbers are second timestamps (e.g., 1719500000), and 13-digit numbers are milliseconds (e.g., 1719500000000). JavaScript's Date.now() returns milliseconds.
Why does the displayed time differ from the database?
Usually due to timezone differences. This tool displays in the browser's local timezone, while the database may store UTC. Check that timezone settings match.