If you need to change your time zone in Metatask, please go to the account drop-down menu and choose "Profile Settings". 

Then go to the tab "General settings" and choose the correct timezone from the drop-down list. Remember to click "Save changes" after that.

Synchronizing time zone in Metatask is important for due dates "Tomorrow", "Today", "Yesterday", so they can be shown correctly.
Metatask also sends you email reminder about Tasks due today - please synchronize time zone to get this email on time, 8 am.