Illustrative example. The dates and amounts below are provided for practice.
A couple wants to celebrate inclusive Day 100 and finish an album two weeks before it. This needs a milestone target and a separate preparation date.
Find the celebration first
Enter January 1, 2027 as the relationship start and January 2, 2027 as the reference. Choose Inclusive day numbers. The next 100-day milestone is April 10, 2027.
Use Milestone Date with Starting Date April 10, 2027, Custom Number of Days 14, and Before starting date. The album checkpoint is March 27, 2027.
Keep both dates in the plan
Save April 10 as a one-time relationship milestone. Save March 27 as the preparation checkpoint, or put the task in a celebration plan and review it on that date.
Day 100 contains the start, so its elapsed offset is 99 days. The fourteen-day preparation interval is a backward elapsed offset. Applying an extra inclusive adjustment to that lead time would shift it unnecessarily.
The checklist does not send task-deadline notifications. Open the site to review it, or use an exported event in a calendar application whose reminders you have checked.