UnixTime · Frontend & Fullstack

Wrong date? Check the timestamp first.

Seconds from the API, milliseconds in the frontend and a local date on screen: check the individual value with UnixTime before digging into your display code.

Inspect JavaScript timestamps on Mac: convert milliseconds and nanoseconds without rounding input values.

See how it works ↓

macOS 14.6+ · One-time purchase · Local to your Mac

OfflinePrivacy without uploadsNo account requiredOn all your Macs

Sound familiar?

Less friction when working with time.

The unit does not match the interface

Convert a supplied value to a date, then check the unit specified by your API contract.

UTC and local time get mixed up

Compare UTC and local representations of the same instant in the format list.

A bug needs a fixed test value

Generate a specific time and use it in your test data.

Your next time value

Three steps to a readable result.

Copy the API value
Copy the individual numeric timestamp received by your frontend.
Convert to UTC
Click the UnixTime menu bar icon or press ⌘⌃U (Command + Control + U). With ISO 8601 UTC selected, you get an unambiguous comparison value.
Compare the display
Compare the result with your UI, checking the expected unit and time zone separately.

The example uses UTC. Your output follows your selected default formats. Direct insertion via a shortcut requires macOS Accessibility permission.

Formats and keyboard shortcuts explained →

UnixTime on Mac: The format list: show, reorder and copy the representations you need. — The format list: show, reorder and copy the representations you need. App screenshot; values may differ from the example.

Precision for log analysis & forensics

Does not round. Down to the nanosecond.

Convert Unix timestamps with nanosecond precision. UnixTime preserves fractional seconds from numeric input timestamps. No floating-point rounding. No zeros recreated from whole seconds.

17908128001234567892026-10-01 00:00:00.123456789 UTC

Example: Unix nanoseconds, a custom date format and the UTC time zone. Source accuracy still matters; conversion does not invent extra measurement precision.

Custom formats: 3, 6 or 9 digits.

Pattern	Display precision	Example
`SSS`	Milliseconds (3 digits)	`.123`
`SSSSSS`	Microseconds (6 digits)	`.123456`
`SSSSSSSSS`	Nanoseconds (9 digits)	`.123456789`

Use, for example yyyy-MM-dd HH:mm:ss.SSSSSSSSS. Nine digits display the full nanosecond fraction. Three or six display only the leading digits, without rounding up. A pattern without S does not display fractional seconds.

Keyboard shortcuts on your Mac

Keep typing. Your timestamp is ready.

Copy your time value and click the menu bar icon — or press ⌘⌃U. Reassign any of the four shortcuts to suit your workflow.

⌘⌃U: Convert the clipboard
⌘⌃V: Convert and replace your selection
⌘⌃⌥V: Append the conversion to the original
⌘⌃N: Insert the current timestamp

⌘ = Command · ⌃ = Control · ⌥ = Option. Inserting, replacing and appending text require macOS Accessibility permission and an editable text field. Clipboard conversion does not require that permission.

Keyboard shortcuts explained →

UnixTime settings: four global keyboard shortcuts and custom separators for appended results — Your shortcuts, your separators. Customise them in Settings.

Before you start

Your questions, answered.

Will UnixTime find the bug in my JavaScript?

No. It gives you a date representation of a time value. Investigating your code remains up to you.

Why use it alongside the browser console?

The menu bar icon and ⌘⌃U also work while you are in API clients, editors and tickets. Your preferred output formats stay close at hand.

How do I display fractional seconds?

Use a custom date format: SSS for milliseconds (3 digits), SSSSSS for microseconds (6 digits), or SSSSSSSSS for nanoseconds (9 digits). Choose nine digits to display all available nanoseconds. Shorter patterns show only the leading digits, without rounding up.

What do I need to use keyboard shortcuts?

UnixTime must be running on your Mac. All shortcuts can be reassigned. Replacing, inserting and appending text require macOS Accessibility permission and an editable destination. Converting the clipboard with the menu bar icon or ⌘⌃U does not require that permission. ⌘ means Command, ⌃ means Control and ⌥ means Option (Alt).

Does it work offline?

Yes. Conversion, the date generator and history run locally. They need neither an account nor an internet connection. UnixTime is a one-time purchase without a subscription; see the Mac App Store for the current price.

For your next timestamp