Got 'Etc/Unknown' after calling dayjs.tz.guess

[Adophlidu]

Describe the bug Got 'Etc/Unknown' after calling dayjs.tz.guess

Expected behavior A right time zone. Under what circumstances would this result be obtained?

Information

• Day.js Version [^1.11.7]

[Loori-R]

Etc/Unknown timezone states that timzone information cannot be determined based on user's preferences.

[ZoomIsland]

Given that Etc/Unknown can be returned from .guess, my app is getting a bug with a user when we use .format('L LT z') -- presumable from how this calls Intl.DateTimeFormat with an unknown timezone.

It would be great if dayjs handled this gracefully! I intend to have a try/except in my code to handle.

[christianschoenmakers]

+1 - would be great to provide a fallback (for example to UTC) when a Timezone can't be determined

Now fixed it this way in my Vue application:

const currentTimezone = ref(dayjs.tz.guess() !== 'Etc/Unknown' ? dayjs.tz.guess() : 'UTC');