Timestamp Converter
Convert between Unix timestamps and human-readable dates instantly.
BeginnerUtility ToolsFreev1.0.0Updated Jul 25, 2025
Current Unix Timestamp
1786474649
1786474649000 ms • Updates every second
Unix Timestamp
All Conversions in Your Browser
All timestamp conversions happen locally using JavaScript's Date API. No data is sent to any server. The Unix timestamp is timezone-independent (always UTC), making it ideal for storing and comparing dates across different time zones.
How to Convert Timestamps Online
Converting between Unix timestamps and human-readable dates is simple:
- Timestamp to Date — Paste your Unix timestamp in the input field. The tool auto-detects whether it's in seconds (10 digits) or milliseconds (13 digits) and instantly shows the date in ISO 8601, UTC, local time, and relative formats.
- Date to Timestamp — Switch to the “Date → Timestamp” tab, enter or select a date and time, and the tool shows the Unix timestamp in both seconds and milliseconds.
- Copy the result — Click the copy button on any result row to copy the value to your clipboard. Each format has its own copy button.
Features
- Live current Unix timestamp display that updates every second
- Auto-detection of seconds (10 digits) vs milliseconds (13 digits)
- Multiple output formats: ISO 8601, RFC 2822, UTC, local time, and relative time
- Date components breakdown: year, month, day, day of week, hours, minutes, seconds
- Date to timestamp conversion with date picker and time input
- One-click copy for every format and result row
- Supports negative timestamps (dates before 1970)
- Quick-fill buttons to use the current timestamp or current date/time
- 100% browser-based — no server calls, no data collection
- Responsive design works on desktop, tablet, and mobile
Understanding Unix Timestamps
What is the Unix Epoch?
The Unix epoch is January 1, 1970, 00:00:00 UTC — the starting point from which Unix time is measured. Every Unix timestamp represents the number of seconds (or milliseconds) that have passed since this moment. This standard was defined by early Unix developers and has become the universal standard for representing time in computing.
Seconds vs Milliseconds
Unix timestamps can be in seconds (10 digits) or milliseconds (13 digits). Python, C, and Unix systems typically use seconds. JavaScript, Java, and many modern APIs use milliseconds. Our tool auto-detects which unit you're using and displays both values for reference.
Why Timezone Independent?
Unix timestamps represent a single moment in time regardless of timezone. The same timestamp converts to different local times depending on the viewer's timezone, but the moment it represents is identical everywhere. This makes timestamps ideal for databases, APIs, and cross-timezone applications.
Negative Timestamps
Timestamps before January 1, 1970 are negative numbers. For example, the Apollo 11 moon landing on July 20, 1969 has a Unix timestamp of approximately -14182940. Our tool handles both positive and negative timestamps correctly.
Common Use Cases
API Development
Debug API responses that use Unix timestamps for created_at, updated_at, and expiration fields.
Database Management
Interpret and query timestamp columns in MySQL, PostgreSQL, MongoDB, and other databases.
Log Analysis
Convert log file timestamps (often in Unix format) to human-readable dates for investigation.
Cron Jobs & Scheduling
Calculate exact Unix timestamps for scheduling tasks in cron, Celery, AWS CloudWatch, and other systems.
Cache Headers
Set and interpret Cache-Control, Expires, and ETag headers that use Unix timestamps.
Session Management
Debug session tokens and authentication tokens that contain timestamp-based expiry information.
Data Migration
Convert dates between different storage formats during data migration between systems.
Documentation & Reports
Convert timestamps in documentation, bug reports, and support tickets to readable dates.
Tips for Working with Timestamps
- Use the live timestamp display at the top to quickly get the current Unix timestamp for testing.
- When debugging, check whether the system uses seconds or milliseconds — a common source of errors is mixing the two.
- In JavaScript, use Date.now() for milliseconds or Math.floor(Date.now() / 1000) for seconds.
- In Python, use int(time.time()) for seconds or int(time.time() * 1000) for milliseconds.
- Store timestamps as integers in databases for efficient indexing, sorting, and comparison.
- Use ISO 8601 format for human-readable dates in APIs and config files — it's unambiguous and widely supported.
- For secure token generation, combine timestamps with random data. Use Password Generator for strong random strings.
- For unique identifier generation, combine timestamps with UUIDs. Use UUID Generator to create random UUIDs.
- Need to encode timestamp data for URLs? Use Base64 Encoder for safe Base64 encoding.
- Need to generate QR codes with timestamps? Use QR Code Generator to create scannable time-based codes.
Frequently Asked Questions
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