DateTime supports 1753/1/1 to eternity (9999/12/31), while DateTime2 support 0001/1/1 through eternity. The DateTime2 range is the one that the DateTimePicker supports.
So what you need to do is check for the year of the date - if it's before 1753, you need to change it to something after 1753 in order for the DateTime column in SQL Server to handle it.
Hope this helps.
the Telerik team
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