new Date().getTimezoneOffset() returns the wrong time zone

I am in Israel, so my offset right now should be 120. Yet, when I use new Date().getTimezoneOffset(), I get back -120, so not just a daylight savings issue. Should I simply change every minus to plus and vice versa? I don’t know what might be the case for users in other timezones.

That’s my function:

  firebase
    .database()
    .ref("words/" + newPostKey)
    .set({
      word,
      length: word.length,
      time_to_action: timeToAction,
      output: output,
      lang: project.lang,
      country: project.country,
      user: userUID,
      timestamp : Date.now(),
      timezone_offset : new Date().getTimezoneOffset()
    });

and timezone_offset is what gets saved as -120. I am in Tel Aviv.

Answer

getTimezoneOffset() is working well. This function retuns the number of minutes you have to add to your current time to get the UTC time, so in GMT+X the result is negative.