The reference date can be set via the Reference date (...) button in the Planon header.

In Spaces & Workspaces , the reference date is very important, because elements such as space, space usage, (free) workspace, occupancy, and floor are time-dependent elements. They all have starts and potential ends. After they have ended, they can be succeeded by new spaces, workspaces, space usage, occupancy or floors. Finally, spaces and workspaces that have been ended can also be resumed.

For some elements, such as space usage and workspace occupancy, more than one item can be present simultaneously (on the set reference date). For others only one element is permitted on the set reference date, such as floor attributes and space dimensions.

In short: you can record and retrieve different data for the same element over different periods of time. Spatial information that is linked to a specific period in time can be retrieved by selecting a reference date from that period.