Detecting user location on websites can enhance personalization and compliance, offering tailored promotions and adjusting site content based on geographic data. Two popular methods for determining user location in the browser include the Geolocation API, which requires user permission and provides exact coordinates, and IP address lookup, which offers broader location data such as country and city. While the Geolocation API can be more precise, it depends on user consent and browser support, whereas IP lookup is generally less accurate but more universally applicable. Additionally, determining user time zones can be efficiently achieved using JavaScript libraries like Moment.js and Jstz, or the built-in Intl API, without the need for network calls, making it cost-effective. A simple JavaScript application can be created to detect user location and time zone, enhancing user experience by displaying local and server times and providing location information.