How to replace xsi:nill node value in XML file with the Nintex Workflow?

[#1]

Hi,

I have an empty date field named oldPlannedApprovalDate and PreOldPlannedApprovalDate which are need to be updated with the particular date and time values.

Both my attempts to change it with the Update XML action failed.

First node I tried to update with the Set Node Text, second with the Replace Node Content

Any ideas?