I have a shop that runs in the CET timezone in winter time and CEST in summer time.
Will I be able to use the shop/update webhook to detect the implicit system timezone change, or do I need to handle it in some other way?
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The business logic of the app is only relevant for Denmark due to accounting rules, so for this reason I know the locale should be Danish.
Ah I see. In that case it might make sense to store the iana_timezone (more info) and using a library to do the math for you.
Here's an example using JS and the Moment.js library:
const localTime = moment(1489199400000).tz('Australia/Brisbane')
If you get stuck, let me know the language and I'll look for an example.