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Unix Timestamp Converter: Decode Epoch Time to Human-Readable Dates
Key Takeaways
- Unix timestamps count seconds since January 1, 1970 (UTC) and are the universal way computers store and exchange time data.
- APIs, databases, log files, and JWT tokens all use Unix timestamps — being able to quickly decode them is essential for debugging.
- Timestamps eliminate timezone ambiguity because they represent a single absolute moment in time, unlike formatted date strings.
When you see a number like 1709251200 in an API response, database record, or log file, it represents a specific moment in time: February 29, 2024 at midnight UTC. Unix timestamps are everywhere in software development — from API responses and database fields to JWT tokens and cron job schedules. A timestamp converter lets you instantly translate these numbers into human-readable dates and vice versa, making debugging and data analysis dramatically faster.
Unix time originated in 1970, and the Year 2038 problem will occur when 32-bit timestamps overflow on January 19, 2038
Did You Know
When to Use a Timestamp Converter
API Debugging and Development
REST APIs frequently return timestamps as integers. Quickly decode them to verify that created_at, updated_at, and expires_at fields contain the expected dates.
Log File Analysis
Server logs and application logs often record events with Unix timestamps. Convert them to readable dates to trace issues and establish event timelines.
JWT Token Inspection
JWT tokens contain iat (issued at) and exp (expiration) claims as Unix timestamps. Decode them to verify token validity and troubleshoot authentication issues.
Database Queries and Migration
When writing time-based queries against databases that store dates as integers, convert your target dates to timestamps for accurate filtering.
Tips for Timestamp Conversion
Unix timestamps are in seconds. JavaScript's Date.now() returns milliseconds — divide by 1000 to get a standard Unix timestamp.
Always consider timezone context. Unix timestamps are inherently UTC — the displayed local time depends on your timezone setting.
Negative timestamps represent dates before January 1, 1970. For example, -86400 is December 31, 1969.
The Year 2038 problem affects 32-bit systems. Modern 64-bit timestamps can represent dates billions of years into the future.
All timestamp calculations are performed locally in your browser. No data is transmitted to any external server.