Install from Chrome Web StoreDate and Intl protection
Overrides getTimezoneOffset, Intl.DateTimeFormat, resolvedOptions, and common Date formatting methods so pages read the timezone you chose — not the system default.
V3 · v0.1.1
Spoof Timezone Next
Spoof Timezone Next changes the browser timezone exposed via Date and Intl. Set a fixed or random IANA timezone and limit it to specific sites.
Spoof Timezone Next
Spoof your browser timezone
Features
What you get in practice — not just a checklist.
Fixed IANA timezone
Pick any IANA zone (for example Europe/London) and keep it stable across tabs while you test locale-sensitive flows.
Random mode
Assign a new timezone on each page load when you want to reduce simple timezone fingerprinting during casual browsing.
Per-site controls
Enable or disable spoofing per hostname from the popup. Scope it to all sites, a whitelist, or a blacklist.
Keyboard shortcut
⌘/Ctrl+Shift+T toggles spoofing for the current site so you can compare real vs spoofed behavior quickly.
Local settings only
Preferences stay in chrome.storage.local with no analytics. Refresh pages after changes so scripts re-read the spoofed zone.
Privacy
Settings are stored locally. Details are on the Privacy Policy page.
Permissions
storage
FAQ
Common questions about Spoof Timezone.
How do I verify the spoofed timezone?
Open DevTools on a page and run Intl.DateTimeFormat().resolvedOptions().timeZone. After enabling Spoof Timezone Next, it should report your chosen IANA zone.
Why do I need to refresh after changing settings?
Many sites read the timezone once at startup. Reload the tab so page scripts pick up the patched Date and Intl behavior.
Can every script be spoofed?
Most page JavaScript is covered. Some inline scripts in head may read the real timezone before the patch applies. Chrome Web Store and extension pages cannot be modified.
What is random mode for?
Random mode picks a new timezone on each load to make trivial timezone-based fingerprinting less stable. Use a fixed zone when you are testing a specific region.
Does this hide my IP geolocation?
No. It spoofs timezone APIs only. IP-based location, GPS permissions, and other signals are unchanged.
Blog
Guides and tips for getting more out of Spoof Timezone.
Test locale flows without a VPN
Fixed IANA spoofing helps QA date formatting, scheduling UIs, and “local time” labels.
Set a fixed zone that matches the market you are testing, reload the app, and walk through date pickers and timestamps. You will catch hard-coded offsets faster than switching OS settings.
Keep spoofing limited to your staging host via whitelist so everyday browsing still uses your real timezone.
Timezone fingerprinting basics
Your timezone is a small but sticky browser signal. Here is what Spoof Timezone Next changes — and what it does not.
Sites can read timeZone through Intl and offset through Date. Spoofing those APIs alters that signal for page scripts.
It will not mask network geolocation. Combine privacy tools intentionally instead of assuming one extension covers every fingerprint surface.
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