Timestamp Converter
Convert between Unix timestamps and human-readable dates. Perfect for debugging, logging, and date manipulation.
Current Timestamp (Live)
Timestamp to Date
Example: 1775994917198
Date to Timestamp
What is a Unix Timestamp?
A Unix timestamp (also known as Epoch time or POSIX time) is a way of tracking time as a running total of seconds or milliseconds since January 1, 1970, at 00:00:00 UTC. This date is known as the Unix Epoch. Unix timestamps are widely used in programming, databases, and APIs because they provide a simple, universal way to represent dates and times.
This tool allows you to convert between Unix timestamps and human-readable date formats, supporting both seconds and milliseconds precision. It also provides relative time calculations and multiple date format options.
How to Use This Tool
Timestamp to Date
- Select unit (milliseconds or seconds)
- Enter your Unix timestamp
- Click "Convert" to see all date formats
- View relative time, ISO format, UTC, and more
Date to Timestamp
- Select date and time using the inputs
- Or click "Use Now" for current time
- Click "Convert to Timestamp"
- Copy timestamp in seconds or milliseconds
Current Timestamp
- View live current timestamp (updates every second)
- Available in both milliseconds and seconds
- Quick copy buttons for both formats
- Use current timestamp for instant conversion
Format Options
- ISO 8601: Standard format for APIs
- UTC: Universal coordinated time
- Local: Your local timezone
- Relative: Human-readable (e.g., "2 hours ago")
Seconds vs Milliseconds
Seconds (10 digits)
The original Unix timestamp format. Used by many Linux/Unix systems, PHP, Python's time module, and some databases. Current timestamps are around 1.7 billion seconds.
Milliseconds (13 digits)
JavaScript's native format (Date.now()). Also used by many modern APIs, Node.js, and databases like MongoDB. Provides millisecond precision for high-resolution timing.
Quick tip: If your timestamp is 10 digits, it's in seconds. If it's 13 digits, it's in milliseconds. The tool auto-detects based on the number of digits.
Common Use Cases
1. API Development & Integration
REST APIs commonly return timestamps for created_at, updated_at, and expires_at fields. When integrating third-party APIs, you'll frequently need to convert these timestamps to display dates to users or calculate time differences. This tool makes it easy to quickly verify timestamp values during API testing and debugging.
2. Database Query Filtering
Many databases store dates as Unix timestamps for efficiency. When writing queries to filter records by date range, you need to convert human dates to timestamps. For example, finding all orders from the last 30 days requires calculating the timestamp for 30 days ago and using it in your WHERE clause.
3. Application Log Analysis
Server logs and application logs frequently use Unix timestamps for precise time tracking. When debugging issues, you need to convert these timestamps to readable dates to understand the sequence of events, correlate errors across services, and identify patterns in system behavior.
4. Debugging Time-Based Features
When working with session expiration, JWT tokens, cache TTL, or any time-sensitive features, timestamps are essential. This tool helps verify that expiration times are set correctly, understand when tokens will expire, and debug time-related bugs that might not be immediately obvious.
5. Test Data Generation
Creating realistic test data requires accurate timestamps. Whether you're seeding a database, generating mock API responses, or creating test scenarios that depend on specific dates, this tool helps you quickly generate the correct timestamp values for any date and time you need.
6. Cron Jobs and Task Scheduling
When scheduling tasks or setting up cron jobs, you often need to calculate future timestamps. For example, scheduling a report to run at a specific date/time, setting reminder notifications, or calculating when a subscription will renew. This tool makes it easy to convert your target date to a timestamp for your scheduling system.
7. Analytics and Reporting
Analytics systems often store event timestamps. When building reports or analyzing user behavior, you need to convert these timestamps to meaningful dates. Understanding time zones is crucial - this tool shows both UTC and local time to help you interpret analytics data correctly across different regions.
Understanding Timezones and UTC
Unix timestamps are always in UTC (Coordinated Universal Time), which is timezone-independent. This means a timestamp represents the same moment in time regardless of where you are in the world. When converting to human-readable dates, you can display the time in UTC or convert it to your local timezone.
UTC (Universal Time)
The standard reference timezone. No daylight saving adjustments. Perfect for storing timestamps in databases and APIs since it never changes based on location.
Local Time
Time adjusted for your current timezone and daylight saving time. Better for displaying dates to users since it shows time in their local context.
Best Practice: Always store timestamps in UTC in your database. Convert to local time only when displaying to users. This prevents confusion with daylight saving changes and makes it easier to support users in different timezones.
Important Timestamp Values
Y2K38 Problem: 32-bit systems will run out of positive integers for timestamps in 2038. Modern 64-bit systems aren't affected. JavaScript uses 64-bit numbers, so it can represent dates until approximately year 292,277,026,596.
Frequently Asked Questions
Why do we use Unix timestamps?
Unix timestamps are simple, universal, and timezone-independent. They make date arithmetic easy (no need to worry about leap years or months with different days), they're compact (just one number), and they work across all programming languages and databases without conversion issues.
How do I know if my timestamp is in seconds or milliseconds?
Count the digits. Seconds timestamps are currently 10 digits (like 1700000000), while milliseconds are 13 digits (like 1700000000000). As a rule, if the timestamp looks too large or results in a date far in the future, try converting it with a different unit.
Can Unix timestamps be negative?
Yes! Negative timestamps represent dates before the Unix Epoch (January 1, 1970). For example, -86400 represents December 31, 1969. However, not all systems support negative timestamps, so be cautious when working with historical dates.
What is ISO 8601 format?
ISO 8601 (like 2024-01-15T12:30:00Z) is an international standard for date/time representation. The 'Z' at the end means UTC. This format is widely used in APIs and JSON because it's unambiguous and includes timezone information. Our tool displays timestamps in this format.
Do timestamps account for leap seconds?
No. Unix time doesn't include leap seconds - it assumes every day has exactly 86,400 seconds. When a leap second occurs (added to keep atomic time synchronized with Earth's rotation), Unix time either repeats a second or jumps. This rarely matters for most applications.
How do I convert timestamps in my code?
In JavaScript: new Date(timestamp) for ms or new Date(timestamp * 1000) for seconds. In Python: datetime.fromtimestamp(timestamp). In PHP: date('Y-m-d H:i:s', $timestamp). Most languages have built-in functions for this.
Privacy & Security
All timestamp conversions happen entirely in your browser. Your data never leaves your device. This tool runs 100% client-side for complete privacy and security.