All the notifications come through with a PST timezone. A nice feature would be allowing an account (or device/organisation) to have a home timezone and for the alerts to be use that timezone.
BTW, I did have a look, but can’t find this feature in any of the usual places e.g. Account, Settings.
Thank you for posting about this. Currently we do not have a setting for Timezone preference. I have put in an enhancement request to add this functionality.