Sidecar / Extensions / Timezone Peek
Timezone Peek
Select a time that names its timezone and see it in yours.
v1.0.0Every site0 requestsFree
- Works in
- Chrome, Edge, Brave on macOS and Windows
- Understands
- Named zones, UTC offsets, ISO timestamps
- Daylight saving
- Handled by the browser, always current
- Network
- None
- Version
- 1.0.0, Manifest V3
Timezone Peek is a free Chrome extension that converts times to your local timezone when you select them. Highlight something like "3pm ET" or "15:00 UTC" on any page and a small card shows the same moment where you are. If the text does not name a timezone it does nothing, because a bare "3pm" cannot be converted correctly.
The rule that makes it trustworthy
If the text does not say which timezone it means, the extension stays silent. A confident wrong answer about a meeting time is worse than no answer at all.
So it converts 3pm ET, 3:30 PM EST, 9:00 am JST, 15:00 UTC, 14:00 UTC+2 and full ISO timestamps. It ignores 3pm, 15:00 and every other bare time.
Daylight saving and day shifts
Conversions use the browser's own timezone data, so they stay correct through every daylight saving change without the extension ever needing an update. When a conversion crosses midnight the card says so, labelled next day or previous day, because that is the detail people actually get wrong.
Where abbreviations are ambiguous
A few abbreviations mean different things in different parts of the world. CST is both US Central and China Standard. IST is India, Ireland and Israel. BST is Britain and Bangladesh. Each resolves to the reading that dominates English business writing, and the card names the city it used, so you can see the assumption instead of trusting it blindly.
Permissions
Reads your text selection on pages. It never modifies the page. Nothing is wrapped, rewritten or scanned in the content itself, which is what keeps it from breaking editors and web apps.
Install it
About a minute, no account, no configuration.
01
Download the .zip and unzip it wherever you keep things.
02
Open chrome://extensions in your browser.
03
Switch on Developer mode, top right of that page.
04
Click Load unpacked and pick the unzipped folder.
05
Reload the page you want it on. That is the whole setup.
Questions about Timezone Peek
Why does nothing happen when I select "3pm"?
Because a time with no timezone cannot be converted. Guessing would produce a confident wrong answer, so the extension stays silent instead. Select "3pm ET" and it will convert.
Does it handle daylight saving time?
Yes. Conversions run through the browser's built-in timezone database, so they are correct year round and never need updating.
What does it do with CST, which is ambiguous?
It resolves CST to US Central, the dominant reading in English business writing, and the card names the city it used so the assumption is visible rather than hidden.
Does it change the page?
No. It reads your selection and renders a card in its own isolated element. Page content is never modified, which is why it does not break rich text editors.
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