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Your browser and an IP lookup are reporting different things. new Intl.DateTimeFormat().resolvedOptions().timeZone returns the default time zone used by the browser’s JavaScript runtime; an IP geolocation service estimates a time zone from data associated with the network address it sees. A mismatch can be normal, and neither result by itself proves where you are physically located.
What each time-zone result tells you
| Result | What it represents | What it depends on |
|---|---|---|
| Browser time zone | The default time zone used by the JavaScript runtime. | The runtime’s configured default. MDN says the resolved value is an IANA time-zone name when no time zone is supplied to the formatter. MDN documentation |
| IP time zone | A time zone associated with the visible IP address in a provider’s geolocation data. | The provider’s data and how precisely it can locate that IP. MaxMind documents time-zone data for products that also contain city-level geolocation; in relevant cases with country-only location, a country’s default time zone may be used. MaxMind’s IP geolocation data documentation |
These are separate signals rather than competing readings of the same setting. The browser check does not ask an IP database for a location, and an IP lookup does not read the browser’s runtime time zone.
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Check the browser’s time zone
In a browser’s JavaScript console, run:
new Intl.DateTimeFormat().resolvedOptions().timeZoneThe result is the resolved timeZone option for a formatter with no explicit time zone. MDN describes it as an IANA time-zone name and explains that the runtime’s default is used in this case. See MDN’s method documentation.
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Why the answers can differ
Your device setting and network location do not match
The time zone configured for the browser’s runtime can differ from the area an IP geolocation provider associates with the network address. That can happen without either result being broken: one reports a runtime setting, while the other is an estimate based on network data.
#1 Best Overall
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Magicmoon 2-Pack 24 Inch Computer Privacy Screen Filter for 16:9 Monitor
- Compatible Model(s): Magicmoon brand filter only for 24 inch -diagonally measured - widescreen monitor - aspect ratio 16:9 - filter size: width: 20 15/16", Height: 11 13/16" (531mm x 298mm)
- Superior Privacy: The computer privacy filter makes the screen appear dark when looking at it from an angle (the angle is about 30 to 60 degree), but bright when looking directly at it. To change the privacy level - simply adjust your monitor’s brightness accordingly
- Eye and Screen Protection: Privacy Filter does not only protect your private life but also protects your eyes by blocking 30% of blue light , blocking the harmful blue light between 380 to 495 nm, it filters out the blue light and relieves eye strain
- Perfect For Open Workspaces: Great for maintaining screen privacy in open work spaces
- Includes Two Options: Option 1 uses clear adhesive strips that securely attach to any computer screen. Option 2 (for computer screens with a raised bezel only) uses slide mount tabs that easily stick to the display frame, allowing you to slide the privacy screen filter on and off as needed
A VPN, proxy, or managed network changes the visible IP
A VPN or proxy may make a site see the intermediary’s IP rather than the address of the device’s local connection. Corporate networks and other routing arrangements can also affect which address a lookup evaluates. The IP result describes its estimate for that visible address, not necessarily the device’s location.
Mobile and ISP address allocation can be broad or variable
Mobile networks and internet service providers may use address allocations that make the inferred location broad or less stable. MaxMind identifies network factors such as VPNs, proxies, mobile networks, and ISP practices as relevant to geolocation accuracy; these are possibilities to investigate, not proof that a particular lookup is wrong. MaxMind’s geolocation accuracy guidance
Rank #2
![[2 Pack] 24 Inch Computer Privacy Screen Filter for 16:9 Widescreen Monitor](https://m.media-amazon.com/images/I/41SBKw3J4ML._SL160_.jpg)
[2 Pack] 24 Inch Computer Privacy Screen Filter for 16:9 Widescreen Monitor
- 【24 PRIVACY FILTER DIMENSIONS】 Width: 20 15/16" (20.9 inches/532 mm), Height: 11 13/16" (11.8 inches/299 mm) - 16:9 Aspect Ratio. Mamol computer privacy filters are designed to be perfectly compatible with HP, Samsung, Dell, Lenovo, Acer, Asus, LG, ViewSonic and other brands of monitors. Please check the width and height dimensions of your computer screen before ordering. If you have any questions about the dimensions, please contact us.
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The IP lookup may have limited geographic detail
Not every IP geolocation product includes a time-zone field. MaxMind says that field is included only in products with city-level geolocation; for certain country-only results, a country’s default time zone may be returned. A time zone inferred from coarse geographic data should not be read as a precise local setting. MaxMind’s field and coverage notes
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How to investigate a mismatch
- Record the browser value. Run the JavaScript check above and note the IANA name it returns.
- Inspect the IP lookup’s result. Note its returned time zone or label, and whether the service reports city-, region-, or country-level location. The available fields vary by provider and product.
- Check the connection path. Consider whether a VPN, proxy, corporate network, mobile connection, or ISP address allocation could affect the IP visible to the lookup.
- Compare like with like. The browser value is a runtime setting; the IP value is a geolocation estimate. Use the browser result when you need to know what time zone the runtime is using, and treat the IP result as an approximate network-location signal.
Does a mismatch mean your location is exposed?
No. The mismatch alone does not establish that your physical location has been exposed or misreported. An IP time zone is an inference about a network address, not proof of a person’s location. MaxMind says it cannot guarantee 100% geolocation accuracy and that GeoIP data is not precise enough to identify a particular person, household, or street address. Read MaxMind’s accuracy guidance.
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Bestseller No. 3
Best Value
ZOEGAA [2-Pack Computer Privacy Screen Protector 24 Inch 16:9 Aspect Ratio
- [How To Determine The Screen Size]: Before Purchasing Our 24 inch privacy screen for monitor, Please Measure The Size Of Your Computer Screen First. Our computer privacy screen 24 inch Is Suitable For Computer Screens With A Width Of 20.92 Inches (53.13 Cm), A Height Of 11.77 Inches (29.89 Cm), And A Diagonal Length Of 24 Inches (60.96 Cm). (It Is Not Recommended To Choose The Size Only Based On The Diagonal Length.) The ZOEGAA 24-Inch 16:9 computer privacy screen Is Compatible With HP, Samsung, Dell, Lenovo, Acer, ASUS, Viewsonic And Other 24-Inch 16:9 Computer Monitors. Welcome To Your Purchase!
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Peslv 2-Pack 24 Inch 16:9 Computer Monitor Privacy Screen, WxH:532 * 299mm
- 【PRIVACY FILTER DIMENSIONS】- Width: 20 15/16" (532 mm), Height: 11 13/16" (299 mm), Diagonal: 24" (609.6 mm) - Peslv Dark 24 inch Privacy Screen Filter is engineered to be compatible with 24in Dell, HP, Samsung, Lenovo, LG, Acer, ASUS, Toshiba, ViewSonic, Aoc, Sceptre, PHILIPS, ViewSonic and other brands monitors with 16:9 aspect ratio. Please verify your computer screen's width and height measurements before ordering. It is not recommended to select a size based solely on the diagonal.
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Rank #3
SightPro 24 Inch 16:9 Computer Privacy Screen Filter for Monitor - Privacy Shield and Anti-Glare Protector
- 【Privacy Filter Dimensions】- Width: 20 15/16" (532 mm), Height: 11 13/16" (299 mm), Diagonal: 24" (609.6 mm) - SightPro Blackout Privacy Screen Filter is engineered to be compatible with HP, Dell, Samsung, Lenovo, LG, Acer, ASUS, ViewSonic, and other monitor brands. Please verify your computer screen's width and height measurements before ordering. It's not recommended to make your selection based solely on your computer screen's diagonal size.
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