https://www.dotnetzone.gr:443/cs/blogs/abekiaris/archive/2010/05/05/sqldatetime-overflow-must-be-between-1-1-1753-12-00-00-am-and-12-31-9999-11-59-59-pm.aspxWhen you try assign a only time to a datetime and save it you are going to get an an exception like the one in the subject. i have added to eXpand an SqlDateTimeOverFlowValueConverter to help you deal with that public class SqlDateTimeOverFlowValueConverterelCommunityServer 2.1 SP3 (Build: 20423.1)