Timestamp Converter
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Enter a timestamp or date and click Convert to see the result
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About Timestamp Converter
Convert Unix timestamps to readable dates and vice versa. Free online timestamp converter.
How to Use
Step 1
Select conversion mode: Timestamp → Date or Date → Timestamp
Step 2
For Timestamp → Date: Enter Unix timestamp, select unit (seconds or milliseconds), click Convert
Step 3
For Date → Timestamp: Select date and time, click Convert
Step 4
View the result in multiple formats (ISO 8601, UTC, Local time)
Step 5
See relative time (e.g., '2 hours ago', 'in 3 days')
Step 6
Use 'Copy' buttons to copy any format to clipboard
Step 7
Use 'Use Current Timestamp' to convert the current time
Step 8
Use 'Auto-Detect Unit' to automatically detect seconds or milliseconds
Step 9
Click 'Clear' to reset and start a new conversion
Features & Benefits
- ✅Two conversion modes: Timestamp → Date and Date → Timestamp
- ✅Convert Unix timestamps to human-readable dates
- ✅Convert dates to Unix timestamps (seconds and milliseconds)
- ✅Support for both seconds and milliseconds timestamps
- ✅Live current timestamp display (updates every second)
- ✅Display in multiple formats: ISO 8601, UTC, Local time
- ✅Show relative time (e.g., '2 hours ago', 'in 3 days')
- ✅Quick copy buttons for all formats
- ✅Auto-detect timestamp unit (seconds or milliseconds)
- ✅Use current timestamp button for instant conversion
- ✅Date and time picker for precise input
- ✅Timestamp validation (1970-2100 range)
- ✅Day of week display
- ✅Large, easy-to-read result displays with gradient backgrounds
- ✅Color-coded results (blue for timestamp→date, purple for date→timestamp)
- ✅Monospace font for timestamps and technical formats
- ✅100% browser-based - data never sent to server
- ✅100% free - no limits, no signup required
FAQs
What is a Unix timestamp?
A Unix timestamp is the number of seconds (or milliseconds) that have elapsed since January 1, 1970, 00:00:00 UTC (the Unix epoch). It's a standard way to represent dates and times in computer systems. For example, 1609459200 represents January 1, 2021, 00:00:00 UTC.
What's the difference between seconds and milliseconds timestamps?
Seconds timestamps count seconds since the Unix epoch (e.g., 1609459200). Milliseconds timestamps count milliseconds since the epoch (e.g., 1609459200000). Milliseconds provide more precision (down to 1/1000th of a second) and are commonly used in JavaScript. Seconds are more common in Unix systems and databases.
How do I know if my timestamp is in seconds or milliseconds?
Use the 'Auto-Detect Unit' button! Generally, timestamps after year 2001 in seconds are greater than 1,000,000,000. Milliseconds timestamps are much larger (greater than 10,000,000,000). For example: 1609459200 = seconds, 1609459200000 = milliseconds. Both represent the same moment (Jan 1, 2021).
What is ISO 8601 format?
ISO 8601 is an international standard for date and time representation. It looks like: 2021-01-01T00:00:00.000Z. The 'T' separates date and time, and 'Z' indicates UTC timezone. This format is unambiguous, sortable, and widely used in APIs, databases, and data exchange.
What does 'relative time' mean?
Relative time shows how far in the past or future a timestamp is from now, in human-friendly terms. Examples: '2 hours ago', 'in 3 days', '5 minutes ago', 'in 1 year'. This helps you quickly understand when something happened or will happen without calculating the difference yourself.
Why does the current timestamp keep changing?
The current timestamp updates every second because time is constantly moving forward! Each second, the Unix timestamp increases by 1 (or 1000 in milliseconds). This live display helps you see the current moment's timestamp, which is useful for testing, logging, or understanding how timestamps work.
Can I convert dates in the past or future?
Yes! The converter works with any date from 1970 to 2100. You can convert historical timestamps (e.g., 1980s) or future timestamps (e.g., 2050s). The relative time will show 'X ago' for past dates and 'in X' for future dates. Dates before 1970 have negative timestamps.
What's the difference between UTC and Local time?
UTC (Coordinated Universal Time) is the global time standard, with no timezone offset. Local time is adjusted for your computer's timezone. For example, if you're in New York (UTC-5), a timestamp might show as '7:00 PM' local time but '12:00 AM UTC' (midnight). The converter shows both for clarity.
How accurate is the timestamp converter?
The converter is 100% accurate for all timestamps from 1970 to 2100. It uses JavaScript's built-in Date object, which handles timezones, daylight saving time, and leap seconds automatically. The live current timestamp updates every second with millisecond precision.
Can I use this for programming and APIs?
Absolutely! This tool is perfect for developers. Use it to: debug API responses with timestamps, test date/time logic, convert database timestamps, understand log file timestamps, generate test data, or verify timezone conversions. The ISO 8601 format is especially useful for APIs and JSON.
What is the Unix epoch?
The Unix epoch is January 1, 1970, 00:00:00 UTC. This is the 'zero point' for Unix timestamps. All timestamps are counted from this moment. It was chosen when Unix was developed in the early 1970s. A timestamp of 0 represents the epoch itself.
Why do some timestamps have 10 digits and others have 13?
10-digit timestamps are in seconds (e.g., 1609459200), while 13-digit timestamps are in milliseconds (e.g., 1609459200000). Both represent the same moment—milliseconds just have more precision. JavaScript's Date.now() returns milliseconds, while many Unix systems use seconds.
What is the Y2038 problem?
The Y2038 problem (also called the Unix Millennium Bug) occurs on January 19, 2038, when 32-bit signed integer timestamps overflow (max value: 2,147,483,647 seconds). Modern 64-bit systems don't have this issue. This converter works fine beyond 2038 because JavaScript uses 64-bit numbers.
Can I convert timestamps with timezones?
The converter shows results in both UTC (universal) and your local timezone automatically. Unix timestamps themselves are timezone-agnostic—they represent a specific moment in time globally. The timezone only matters when displaying the timestamp as a human-readable date. The converter handles this for you.
Is my timestamp data saved or sent to a server?
No! All conversions happen entirely in your browser using JavaScript. Your timestamps and dates are never sent to a server, saved, or stored anywhere. The converter is completely private and works offline once the page is loaded. Each conversion is temporary and session-based.