What is a Unix Timestamp Converter?
A Unix Timestamp (Epoch Time) Converter is a tool that converts computer-used Unix timestamps into human-readable date/time formats, and vice versa.
It is useful for quickly checking and converting timestamps in various development tasks such as programming, database management, API debugging, and log analysis. It automatically detects seconds and milliseconds units, and provides results in multiple formats including ISO 8601, UTC, and local time.
Key Features
Real-Time Current Timestamp
Displays the current Unix timestamp in both seconds and milliseconds in real-time. One-click copy available.
Two-Way Conversion
Supports both timestamp-to-date and date-to-timestamp conversion.
Auto-Detection of Seconds/Milliseconds
Automatically distinguishes between seconds (10 digits) and milliseconds (13 digits) by analyzing the input.
Multiple Output Formats
View conversion results in various formats including ISO 8601, UTC, local time, and relative time.
How to Use
- Choose Conversion Direction — Click 'Timestamp to Date' or 'Date to Timestamp' to select the conversion mode.
- Enter a Value — Enter a Unix timestamp number or select a date/time. Use the 'Now' button to quickly input the current time.
- View Results — Conversion results are instantly displayed in multiple formats: ISO 8601, UTC, local time, and relative time.
- Copy Results — Click the 'Copy' button next to any format to copy it to your clipboard.
Use Cases
API Response Debugging
Quickly convert Unix timestamps in REST API responses to human-readable date/time for verification.
Database Management
Convert timestamp values stored in MySQL, PostgreSQL, and other databases to dates for data analysis.
Log File Analysis
Convert Epoch Time recorded in server logs to actual date/time to precisely identify when events occurred.
JWT Token Verification
Convert timestamp claims like exp (expiration time) and iat (issued at) in JWT tokens to dates to verify token validity.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp (Epoch Time) is the number of seconds (or milliseconds) elapsed since January 1, 1970 00:00:00 UTC (Unix Epoch). It is a standard way to represent time across operating systems, programming languages, and databases.
How do I distinguish between seconds and milliseconds?
Typically, a 10-digit number represents seconds, while a 13-digit number represents milliseconds. This tool includes auto-detection that analyzes the number of digits in your input, and you can also manually select the unit.
What is the Year 2038 problem (Y2K38)?
On 32-bit systems, the Unix timestamp will experience integer overflow on January 19, 2038 at 03:14:07 UTC. 64-bit systems are not affected, and most modern systems have already transitioned to 64-bit.
What is the difference between UTC and local time?
UTC (Coordinated Universal Time) is the global standard time, while local time is adjusted for the user's timezone. For example, KST (Korea Standard Time) is UTC+9, meaning it is 9 hours ahead of UTC. Unix timestamps themselves are always UTC-based regardless of timezone.
Is my data sent to any server?
No. All conversions are processed with JavaScript in your browser. No data is transmitted to any server. Use it with confidence.
Privacy Notice
This timestamp converter performs all processing in your browser. Timestamps and date information you enter are never sent to any server, and no data is stored externally. Use it with complete confidence.