How does the message work based on timezone?
There are two different kinds of delivery time zone:
Fixed time zone
Follower`s time zone
Basically, if you've set the message to send out at 4PM, your followers will receive it whenever it's 4PM in their time zone.
You can find its setting in how to set up Standard Campaign.

Each follower message will be delivered according to their own time zone from (Must be scheduled minimum 24 hours in advance)
Should you need further support, please feel free to contact us via live chat or email us at support@fireapps.io
Fixed time zone
Follower`s time zone
Fixed time zone
Basically, if you've set the message to send out at 4PM, your followers will receive it whenever it's 4PM in their time zone.
You can find its setting in how to set up Standard Campaign.

Follower`s time zone
Each follower message will be delivered according to their own time zone from (Must be scheduled minimum 24 hours in advance)
Should you need further support, please feel free to contact us via live chat or email us at support@fireapps.io
Updated on: 16/10/2020
Thank you!