> 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/historical-data-and-backfill/apple-late-historical-workout-timestamps.md).

# Why is a workout timestamp weeks in the past?

Workout timestamps reflect **when the activity was originally performed, not when it was synced**.

Third-party apps can write historical workouts into Apple Health at any time, and the SDK picks them up on the next sync, so a payload can carry an old date.

To confirm, the user can **check the Health app's 'Added to Health' date** for that workout, which shows it was written late.


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