Focusing on the date aspect for a minute: is it possible to adjust the data (before the deidentification process) and convert relevant absolute dates into dura

Focusing on the date aspect for a minute: is it possible to adjust the data (before the deidentification process) and convert relevant absolute dates into durations? For example, is it possible (and is it useful) to adjust the data so that it says something like "patient abc123 entered the study in 2021 and 83 days after receiving a vaccine they showed started to show symptoms. Symptoms ended 3 days later"