dayjs timezone is not work in expo app

[SteveYuOWO]

  const a = dayjs(new Date(1384775720)).tz("America/Toronto").format("HH:mm:ss");
  const b = dayjs(new Date(1384775720)).tz("Asia/Shanghai").format("HH:mm:ss");

Put the above code into the nodejs running environment. It shows:

{ a: '19:39:35', b: '08:39:35' }

And put it into expo app(https://expo.dev/)

it shows:

00:39:35

Here's my minimal reproduction
https://github.com/SteveYuOWO/expo-dayjs-reproduction

[itajenglish]

I just ripped my hair out for hours trying to figure out why it wasn't working

[SteveYuOWO]

I just ripped my hair out for hours trying to figure out why it wasn't working

So, is there a solution for this? How does the expo app using dayjs solve the time zone issue in general?

[itajenglish]

I just ripped my hair out for hours trying to figure out why it wasn't working

So, is there a solution for this? How does the expo app using dayjs solve the time zone issue in general?

Seems like this is a known issues:

• fix: Fix timezone Date parsing for Hermes JS engine #2843
• The timezone plugin is not compatible with React Native Hermes engine #1377

I'm going to switch to use a different approach for handling dates and timezones for now

[SteveYuOWO]

@itajenglish

dayjs currently has no solution. I use a native function to wrap it as a temporary solution.

SteveYuOWO/expo-dayjs-reproduction#1

[itajenglish]

@itajenglish

dayjs currently has no solution. I use a native function to wrap it as a temporary solution.

SteveYuOWO/expo-dayjs-reproduction#1

Nice! I ended up replacing dayjs with spacetime

[SteveYuOWO]

@itajenglish
dayjs currently has no solution. I use a native function to wrap it as a temporary solution.
SteveYuOWO/expo-dayjs-reproduction#1

Nice! I ended up replacing dayjs with spacetime

Cool. Thank you for recommending this open source repo for me. The solution looks better than mine.