Hello
I guess the problem is that , kendogrid is taking the default format as 'mm-dd-yyyy'. If so there is a chance that , if mm is greater than 12 it will return null.
Just try after specifying the date format.
For Ex:
columns.Bound()
.Format("{0:dd-MMM-yyyy}")
(I am not sure about the exact syntax).
Regards
Dominic Abraham