The read-only Data Mapping 2.0 dialog box displays the old values (if defined) and the new values that will be assigned by the mapping rule. The different sections show the dates that the values assigned by the mapping rule come into effect.
Role feature access: Application Container > People > Employee Profile > Data Mapping Informational Dialog
Dayforce shows each current value (if defined) and the corresponding value suggested by the mapping rules configured by your organization. There are separate sections for the dates each value will be applied.
The Changes Effective Immediately section shows the values that will be applied as of the current date. The Changes Effective On <date> sections show the values that will be applied as of the date specified for the section. In the following example, there is only one Changes Effective On section, for 2/27/2018: