Timestamp Converter
Convert between Unix timestamps and human-readable dates with timezone support
Current Time (UTC)
Unix Timestamp
0
Human Readable
Unix Timestamp -> Human Readable
Accepts 10-digit (seconds) or 13-digit (milliseconds) timestamps
Enter a timestamp to see the result
What is a Unix Timestamp?
A Unix timestamp, also called Unix time, POSIX time, or epoch time, is a single number representing a specific moment in time as the count of seconds (or milliseconds) elapsed since January 1, 1970, 00:00:00 UTC (Coordinated Universal Time). This reference moment is called the Unix epoch. Unix timestamps are the standard way computers represent and store dates/times internally because they're timezone-agnostic, compact (just one number), and easy to calculate time differences with simple arithmetic. For example, the timestamp 1704067200 represents January 1, 2024, at midnight UTC.
Most APIs, databases, and programming languages use Unix timestamps internally. When you check a file's creation date, view an email's sent time, or analyze server logs, the timestamp is often stored as a Unix value in seconds or milliseconds (13-digit timestamps). Developers frequently need to convert between human-readable dates and Unix timestamps for debugging, data analysis, and integration between systems. This tool handles the conversion instantly with timezone support.
Common Use Cases
- Debugging API responses and database records: APIs and databases return timestamps in Unix format. Developers need to convert these numbers to human-readable dates to understand when events occurred (user registration, payment processed, API call made).
- Analyzing server and application logs: Log files record timestamps in Unix format (often with milliseconds). Converting to readable dates helps developers correlate log events with user activities and system failures.
- Checking JWT token expiry: JWT (JSON Web Token) tokens contain an exp (expiry) claim as a Unix timestamp in seconds. Developers convert this to a readable date to verify when tokens expire and whether login sessions remain valid.
- Calculating time differences: Subtracting two Unix timestamps gives the number of seconds elapsed between events — useful for measuring performance, calculating subscription periods, or determining account age.
- Converting between timezones: Unix timestamps are always UTC-based, so converting to different timezones shows what time the same event was in a user's local timezone (important for scheduling, notifications, and international applications).
How to Use This Tool
- Unix to Human: Paste a 10-digit (seconds) or 13-digit (milliseconds) Unix timestamp. The converter auto-detects the format. Select your timezone to see the timestamp in your local time. The human-readable date appears instantly below.
- Human to Unix: Enter a date in YYYY-MM-DD or YYYY-MM-DD HH:mm:ss format. The converter instantly returns the Unix timestamp in both seconds and milliseconds for flexibility with different APIs.
- Batch Convert: Paste multiple timestamps or dates (one per line) to convert them all at once. Useful when analyzing logs or processing batches of data from databases.
- Date Math: Add or subtract time (seconds, minutes, hours, days) from a base date to calculate future or past dates. Useful for calculating subscription expiry dates, deadline calculations, and date-based analysis.
Features
Timezone Support
Convert timestamps to different timezones (UTC, EST, PST, GMT, IST, JST, etc.) to see what time an event occurred in any location worldwide. Essential for international applications.
Auto-Detect Format
The tool automatically detects whether a number is in seconds (10 digits) or milliseconds (13 digits) and converts appropriately. No need to manually specify the format.
Bidirectional Conversion
Convert Unix timestamps to human-readable dates, or convert dates back to timestamps. Useful for data validation and ensuring consistency between systems.
Date Math and Calculations
Add or subtract days, hours, minutes, or seconds from a date to calculate future/past dates. Useful for subscriptions, expirations, and schedule planning.
Frequently Asked Questions
Why do some timestamps have 13 digits instead of 10?
10-digit timestamps count seconds since the Unix epoch, while 13-digit timestamps count milliseconds. JavaScript and some databases use milliseconds for finer precision. Both represent the same moment; you just multiply by 1000 to convert. This tool auto-detects both formats, so you don't need to worry about the difference.
What is the year 2038 problem?
On January 19, 2038, 32-bit Unix timestamps will overflow (reach the maximum value and wrap around), potentially causing systems to malfunction if they haven't upgraded to 64-bit timestamps. Most modern systems use 64-bit timestamps and won't have this issue, but legacy systems running 32-bit code are at risk. This tool uses 64-bit timestamps, so 2038 poses no problem.
What timezone are Unix timestamps in?
Unix timestamps are always in UTC (Coordinated Universal Time), also called GMT. They're timezone-agnostic — the same timestamp represents the same moment worldwide. When you convert a timestamp to a readable date using this tool, you select your desired timezone to see what time that moment was in your location.
How do I convert a timestamp in JavaScript or Python?
JavaScript: `new Date(timestamp * 1000)` for seconds or `new Date(timestamp)` for milliseconds. Python: `from datetime import datetime; datetime.fromtimestamp(timestamp)`. Most languages have built-in date libraries; this tool is useful for quick conversion without writing code.