PS as a consultant with a lot of rolling deadlines, I’ve, personally, always marked due dates as days of the week, relative to today using [M, T, W, R, F, S, Su]

For example:

something due this Friday: F

something due next Friday: 2F

something due tomorrow: TOM

Workflowy Example:

!F Deliverable X for #customerY

!2F Deliverable Z for #customerA

This way you could also filter by specific deliverable/milestone dates

If you could work this in, combined with Guerson Meyer’s solution for reminders and then have the values in the `!` tags auto-update, that would be amazing!!