Set due dates
You can add a due date to a task.
Select a task and then click on the “Add date” icon
You will then be able to select a pre-filled date (Today, Tomorrow, Same day next week) or select a custom date.

A due date set in Google Tasks doesn’t show up in TasksBoard
Section titled “A due date set in Google Tasks doesn’t show up in TasksBoard”TasksBoard displays due dates exactly as Google’s Tasks API provides them.
However, Google stores task dates in two separate places: one that Google’s own apps (the Gmail sidebar, Google Calendar) display, and one that the Tasks API exposes to third-party apps like TasksBoard. Google is known to leave these two out of sync — this affects in particular tasks created from an email in Gmail: a deadline set there can be visible in Google’s apps but never reach the API, so TasksBoard (or any other third-party app) cannot display it.
This can only be fixed by Google. You can star the issue on their API issue tracker here https://issuetracker.google.com/issues/277970542 to speed up the process.
As a workaround, a due date added or edited directly in TasksBoard always sticks and stays in sync everywhere.