Thanks for this post! I can show you how to achieve what you're asking -
For this time-based automation, you will want to use a Table automation rather than a Builder automation. (What you're doing would be triggered by clicking the button rather than by time).
Instead, click on the Automations tab on the left-hand panel of Honeycode, and create an automation for when a Date and Time is reached:
You can see in my screenshot, that I have set this automation to trigger three days before a date in the [Due Date] column.
From here, you can add a "Notify" action to the automation, where you can specify a recipient of the email (you could write a formula to point to a particular contact in a table).
Once you publish the automation, it will be triggered three days before the time specified in the Due Date column and a notification email will be sent.
Let us know if this helps.