You can create a custom form that includes an employee's full time job assignment date. When you add this field to a form, it shows the current date saved in the Key Information tab of the Employment > Employment Settings screen in People. If no date is saved, the field remains blank. Any date you add in the custom form updates the Key Information tab.
The following sample demonstrates the addition of a Full Time Job Assignment Date field:
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<Field>
<Style>IVDatePicker</Style>
<Row>2</Row>
<Column>0</Column>
<BindingProperty>FullTimeJobAssignmentDate</BindingProperty>
<Visible>true</Visible>
<IsRequired>false</IsRequired>
<FieldId>FullTimeJobAssignmentDate</FieldId>
</Field>