React error #425: Timezone formatting causing minification issue

Encountering a strange issue that seems to only occur on Vercel.

The error message reads:

Uncaught Error: Minified React error #425; visit https://reactjs.org/docs/error-decoder.html?invariant=425 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.

This error is triggered by the following line of code:

const result = Intl.DateTimeFormat().resolvedOptions().timeZone.replace(/^.*\//, "")

We have confirmed that this issue does not manifest when running the code locally in development or production mode. It only arises after deployment to Vercel.

Any thoughts on how to resolve this?

javascriptnext.jsvercel

Answer №1

The discrepancy arises from the fact that the Vercel server operates in a different time zone compared to your local machine. This difference explains why you do not experience any errors when running locally, as your local server's time zone aligns with your client's.

Because the date on the Vercel server differs from that of your client, the Vercel server assigns a distinct value to const result, leading to a hydration error on your end.

To circumvent this issue and prevent the hydration error, you can implement a custom hook following the guidance provided here: Next.js - new Date() constructor throwing console errors

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