What's the difference between Unix timestamp in seconds vs milliseconds?

JavaScript Date.now() returns milliseconds (13 digits). Most Unix/Linux systems use seconds (10 digits). Python's time.time() returns seconds. Always check which format your system expects before converting.

How do I convert a timestamp to a specific timezone?

Enter the timestamp, select Seconds or Milliseconds mode, then type the IANA timezone name (e.g., Asia/Shanghai, America/New_York) in the timezone field. The tool converts to both UTC and your specified timezone.

Why is the converted date different from what I expected?

Common causes: wrong timestamp unit (seconds vs milliseconds), timezone offset confusion, daylight saving time (DST) transitions. Try toggling between Seconds and Milliseconds first.

Can I batch convert multiple timestamps?

Yes. Enable batch input and enter one timestamp per line. Each line is converted independently with line labels in the output.

Which tools pair well with Timestamp Converter?

Common next steps include UUID Generator, Cron Parser. These related tools help continue the same workflow through generation, validation, formatting, or debugging.

Last reviewed: 2026-05-15

Timestamp Converter quick answer

Timestamp Converter is a browser-first tool for convert unix time and iso-8601 with time zones.. It is designed for fast one-off work without account setup.

Use it when you need to convert unix time and iso-8601 with time zones.
Use it when you need to timestamp
Use it when you need to date

This text tool is local-first in the browser and does not store your input for normal conversion workflows.

Timestamp Converter returns a copyable result that can be reviewed immediately or continued in a related ToolMeshly workflow.

About Timestamp Converter

Convert between Unix timestamps (seconds or milliseconds) and ISO 8601 date format.

Enter a Unix timestamp or ISO date string.
Select the mode: Seconds or Milliseconds for timestamps.
Optionally specify a timezone (e.g., Asia/Shanghai).
Click Run to convert.
Review the converted results in both formats.
Enable batch input to convert multiple timestamps (one per line).

FAQ

What is Timestamp Converter best for?: Convert between Unix timestamps (seconds or milliseconds) and ISO 8601 date format.
Does Timestamp Converter upload or store my data?: This text tool is local-first in the browser and does not store your input for normal conversion workflows.
What's the difference between Unix timestamp in seconds vs milliseconds?: JavaScript Date.now() returns milliseconds (13 digits). Most Unix/Linux systems use seconds (10 digits). Python's time.time() returns seconds. Always check which format your system expects before converting.
How do I convert a timestamp to a specific timezone?: Enter the timestamp, select Seconds or Milliseconds mode, then type the IANA timezone name (e.g., Asia/Shanghai, America/New_York) in the timezone field. The tool converts to both UTC and your specified timezone.
Why is the converted date different from what I expected?: Common causes: wrong timestamp unit (seconds vs milliseconds), timezone offset confusion, daylight saving time (DST) transitions. Try toggling between Seconds and Milliseconds first.
Can I batch convert multiple timestamps?: Yes. Enable batch input and enter one timestamp per line. Each line is converted independently with line labels in the output.
Which tools pair well with Timestamp Converter?: Common next steps include UUID Generator, Cron Parser. These related tools help continue the same workflow through generation, validation, formatting, or debugging.

Related Tools

UUID Generator Cron Parser

Guides & tutorials

Timestamp Converter

Local processing

Convert Unix time and ISO-8601 with time zones.

Input

Shortcuts: ⌘/Ctrl+Enter run · ⌘/Ctrl+Shift+C copy · ⌘/Ctrl+Z undo