Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds.
Recommended workflows
How to Use Unix Timestamp Converter
- 1
Enter timestamp or date
Paste a Unix timestamp or pick a date and time.
- 2
See conversion
The converted value appears instantly in both formats.
- 3
Choose precision
Toggle between seconds and milliseconds.
- 4
Copy
Click to copy the result to clipboard.
Why Use a Unix Timestamp Converter?
Unix timestamps appear everywhere in software development — database records, API responses, JWT tokens, log files, cron schedules, and file metadata all use numeric timestamps. Converting between human-readable dates and Unix timestamps manually requires knowing timezone offsets, leap seconds, and epoch boundaries. This converter handles all of that instantly. Paste a timestamp from a database query and see the exact date and time. Pick a future date and get the timestamp for scheduling. The tool supports both seconds (10-digit) and milliseconds (13-digit) precision, automatically detecting which format you provide.
Key Features
Bidirectional conversion handles both timestamp-to-date and date-to-timestamp in a single interface. Automatic precision detection determines whether your input is seconds or milliseconds based on digit count. Results display in both UTC and your local timezone simultaneously, eliminating timezone confusion. The current timestamp updates in real time, useful for quick reference during debugging sessions. Relative time display shows how far in the past or future a timestamp is (e.g., '3 days ago' or 'in 2 hours'). Copy buttons provide one-click access to formatted results in multiple formats: ISO 8601, RFC 2822, and locale-specific strings.
Common Use Cases
When debugging API responses, you frequently encounter timestamps like 1716249600 and need to know what date that represents. Database administrators convert timestamps when writing queries with date filters. JWT token debugging requires reading the 'iat' (issued at) and 'exp' (expiration) claims which are Unix timestamps. Log correlation across distributed systems requires converting between different timestamp formats to align events. Cron job scheduling uses timestamps to calculate next-run times. Cache invalidation logic compares current timestamps against stored expiry values. Mobile developers convert between server timestamps (UTC) and device-local display times.
Understanding Unix Time
Unix time (also called POSIX time or Epoch time) counts the number of seconds since January 1, 1970 00:00:00 UTC — known as the Unix Epoch. This system was chosen because it provides a single, unambiguous reference point that is timezone-independent. The 32-bit signed integer representation will overflow on January 19, 2038 (the Y2038 problem), which is why modern systems use 64-bit integers. JavaScript's Date.now() returns milliseconds since epoch, while most server-side languages and databases use seconds. When working across systems, always verify whether you are dealing with seconds or milliseconds to avoid bugs where dates appear as 1970 or far in the future.
Frequently Asked Questions
What is a Unix timestamp?▾
A Unix timestamp counts the seconds since January 1, 1970 (UTC). It is used widely in programming and databases.
Does it handle milliseconds?▾
Yes. Toggle the precision to convert 13-digit millisecond timestamps.
What timezone is used?▾
Results show both UTC and your local timezone.
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