# Selecting the appropriate date

Assume that you want to build a basetable using the following timeline. One of the variables that you would like to add to the basetable is recency, the time since the last donation.

Consider a donor that has donated on the following dates.

• January 1st 2017
• March 23th 2017
• April 29th 2017
• May 15th 2017

Which date should be used to calculate the recency?

50 XP