> For the complete documentation index, see [llms.txt](https://docs.twoowls.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.twoowls.io/getting-started/important-checklists/app-checklist/define-a-timezone.md).
# Define a timezone
{% hint style="info" %}
✅This will tell Two Owls to record your events at the same timezone as the one Facebook uses to report your events, meaning they speak the same time language!
{% endhint %}
Define a timezone in which the app will operate
What happens if I don't set this up?
❌You might see some weird mismatch.
:point\_right:**Event allocated to a date in the past:** Say your Ad Account operates in UTC + 5, and there was a purchase that happened at **1 a.m on June 26 (UTC + 5)**. Two Owls, by default, will record that event in UTC and send Facebook that this event happened at **8 p.m on June 25** (according to UTC).
*Facebook understands this as is, without converting the timezone. That means you won't see that purchase showing up on the 26th in the EM!*\
\
:point\_right:**Events coming from "the future":** In the same manner, some events appear to come from the "future" and Facebook won't accept them. Timezone mismatch is the culprit here.
---
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