This document shows how to access the .NET DateTime Object. In includes 3 VI's the Write_DotNET_DateTime.vi and Read_DotNET_DateTime.vi write and read to a specific .NET object and the DotNet_Time.vi is the main VI that ties them together.
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Block Diagram

NOTE:
If you try to read the .NET DateTime Date Property with a date earlier than January 1, 1601 you will recieve error 1172, refer to the following KnowledgeBase Article for more information.
KnowledgeBase 48RDR2EC: Error 1172 .NET Exception Converting .NET DateTime to LabVIEW Time Stamp