What counts as a valid date string?

Anything JavaScript’s own date parser recognizes — ISO 8601 (e.g. "2024-06-15T10:30:00Z") is the most reliable format to paste.

Is a Unix timestamp in seconds or milliseconds?

Both are supported — pick the matching option. Unix timestamps are traditionally seconds; JavaScript’s own `Date.now()` uses milliseconds.

No — every conversion runs entirely in your browser.

Convert a Unix timestamp or date string into every common format at once — Unix seconds/milliseconds, ISO 8601, UTC and local time.

Unix timestamp Date text (ISO 8601, etc.)

Timestamp

Seconds Milliseconds

Unix seconds

1789730273

Unix milliseconds

1789730273000

ISO 8601

2026-09-18T11:17:53.000Z

UTC

Fri, 18 Sep 2026 11:17:53 GMT

Local

Fri Sep 18 2026 11:17:53 GMT+0000 (Coordinated Universal Time)

1
Enter a timestamp or date
A Unix timestamp (seconds or milliseconds) or a date string like ISO 8601.
2
See every format at once
Unix seconds, Unix milliseconds, ISO 8601, UTC and local time, side by side.
3
Copy the one you need
Each format has its own Copy button.

What counts as a valid date string?: Anything JavaScript’s own date parser recognizes — ISO 8601 (e.g. "2024-06-15T10:30:00Z") is the most reliable format to paste.
Is a Unix timestamp in seconds or milliseconds?: Both are supported — pick the matching option. Unix timestamps are traditionally seconds; JavaScript’s own `Date.now()` uses milliseconds.
Does this tool send my input anywhere?: No — every conversion runs entirely in your browser.