Timestamp Converter
Convert between Unix timestamps and human-readable dates online in your browser without uploading your input to a server.
What this tool does
NexKit Timestamp Converter converts between Unix timestamps (seconds or milliseconds since January 1, 1970 UTC) and human-readable dates, entirely in your browser.
A bare number is ambiguous between seconds and milliseconds. This tool auto-detects which one you likely mean based on digit count (10 digits is assumed to be seconds, 13 digits is assumed to be milliseconds), and you can override the detected unit manually.
How to convert a timestamp
Choose a direction (Timestamp to Date, or Date to Timestamp), enter a value, and the result appears immediately - including ISO 8601, UTC, local time, and both Unix seconds and Unix milliseconds forms.
Use the "Use current time" button to fill in the current timestamp or date.
Privacy and file handling
Your input is converted entirely in your browser. It is not uploaded to NexKit servers by this tool.
Frequently Asked Questions
Is my input uploaded?
No. Timestamps and dates are converted locally in your browser. Nothing is uploaded to NexKit servers by this tool.
How does it know if my number is seconds or milliseconds?
It uses digit count as a heuristic: a 10-digit number is assumed to be seconds (covering roughly the years 2001-2286), and a 13-digit number is assumed to be milliseconds. You can override this manually if the auto-detected unit is wrong for your input.
Does it support dates before 1970?
Yes. Negative Unix timestamps (dates before January 1, 1970 UTC) convert correctly.