Ask HN: How to Prevent Linux Browser from Leaking Location to Timezone Call?

While checking for DNS leaks I noticed that javascript querying my browser for timezone returns not only the UTC offset, but also my actual location, "America/Vancouver." See results from browserleaks.com [1]. This is because Linux specifies the TZ as Continent/City[2]. Is there a way to block this? This is especially troubling when using VPN as the mismatch between your IP and your clock can be a problem -- here's the http://doileak.com report using VPN[3].

[1] https://imgur.com/a/JBMrT

[2]https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

[3] https://imgur.com/a/S4mYS