Developer tool / Time
Timestamp Converter
Convert Unix timestamps and ISO dates locally in your browser, with clear UTC and local time outputs.
Input
Paste Unix seconds or milliseconds.
UTC outputs
Copy stable values for logs, APIs, and debugging.
Unix seconds
Waiting for input
Unix milliseconds
Waiting for input
ISO UTC
Waiting for input
Local output
Displayed using Asia/Bangkok.
Local date and time
Waiting for input
How to use it
- 1 Paste a Unix timestamp or ISO date.
- 2 Review the UTC and local outputs.
- 3 Copy the value you need for logs, APIs, or debugging.
Useful for
- Converting API timestamps into readable dates
- Checking JWT and auth token time claims
- Switching between Unix seconds, milliseconds, and ISO time
Good to know
- Local output depends on your browser timezone and system settings.
- Natural language dates are not supported in this version.
- This tool uses browser date behavior and does not fetch timezone databases or external time APIs.
Questions
Timestamp Converter FAQ
Does the Timestamp Converter upload my dates or timestamps?
No. Conversion happens entirely inside your browser. Utilshub does not receive the timestamp, date, or converted outputs.
How does the tool decide between seconds and milliseconds?
Shorter numeric values are treated as Unix seconds, while longer numeric values are treated as Unix milliseconds. You can also paste ISO date strings directly.
Why is the local time different from UTC?
UTC is a global standard. Local output uses your browser and system timezone, so the displayed calendar date or hour can shift.
Can this tool parse natural language dates?
No. This first version is focused on Unix timestamps and ISO-style date input only.
Continue locally
Related tools
Keep working with another browser-only tool. Your files and tool inputs stay on your device.