If you look at the progression we took on these three “versions”, this last one references the “Serial Number” column, which references each of the three date columns (“Year”, “Month”, and “Day”), which each run a function to grab a specific piece of our original date field. Since we’ve converted the original date into a SharePoint serial number, and broken the original date down into its individual pieces, this approach makes the most sense since the work is already being performed – we’re just going to repurpose it when needed.