> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/faq/help-topics/data-api-sdk/webhooks-dedup-and-sync-reliability/apple-travel-timezone-duplicate-workouts.md).

# Why was the same workout re-sent with a different timezone?

Apple Health timestamps use the device's **current timezone at sync time**, and historical timezones can't be retrieved on iOS. So a workout backfilled after travel can carry a different offset.

Duplicate workouts aren't deduplicated by default. **Dedupe in your own pipeline on the workout's unique ID** so a re-sent copy with a different offset is treated as the same workout rather than a new one.


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