Is there a way (power up or otherwise) to automate due dates (see better description below)

[Deleted user]

Is there a way to automate due dates based on a project start and/or project end date? For example when I open a project I have certain things due 3, 5 and 15 days from the start date and 15 and 10 days from the end date. Is there a way to add in +3 days or +5 days to a card? Is there a power up that might help?

[Stephen Addis]

You set the dates in the card to reflect your requirements.

If you use the powerup Big Picture, it will do most your requirements, and you can set card dependancies, relationships and lead ins.

This will then adjust the dates accordingly, to reflect the periods you have put or moved the bars on the gantt chart to.

Trello will not do it on its own.  Use the power up.