Find if user is in the EU without any extra API or server-side code or IP Address

Find if your user is in the EU (Geolocation api javascript)

// You can easily find out if the user is in the EU calculating the offset from GMT.
// It's not a perfect method but for simple use cases it works perfectly
// It also catches all Africa

const offset = new Date().getTimezoneOffset();


// 0 is GMT and - 120 is Finland - 
// It should catch all the EU - However it also catches most of Africa so use it carefully!

let inEu = false

if (1 > offset && offset > -130 ){
	inEu = true
  console.log("The user is in the European Union!")
}

// Alternatively you could check the timezone
const timezone = Intl.DateTimeFormat().resolvedOptions().timeZone
const continentCity = timezone.split("/")
const continent = continentCity[0]
const city = continentCity[1]
console.log("the user is in ", continent, ". The city is: ", city)
if (continent == 'Europe') {
    inEu = true
    console.log("The user is in the European Union!")
}

Probably the best and easiest way to check if someone is in Europe, is the following:

const inEu = Intl.DateTimeFormat().resolvedOptions().timeZone.startsWith("Europe")? true : false