Lightning Add-On Timezone

I recently moved to a different timezone and noticed that although my Mac laptop was set to the appropriate date and time, any invitation I received via e-mail was skewed by 3 hours.  The Lightning add-on for Thunderbird has it's own timezone setting, which needs to be adjusted.

You will need to go into Thunderbird Preferences:

Then, select the Lightning icon and navigate over to the Timezone tab.  Here you can select the appropriate timezone and all existing calendar events and future invites will reflect the correct time after a restart of the Thunderbird appellation.