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the bug is in build 2012.2.607
it looks like a refactoring/typo error.
my fix to it was to go to line 28334 of telerik.all.js and change
it looks like a refactoring/typo error.
my fix to it was to go to line 28334 of telerik.all.js and change
value = new Date(parseInt(date.replace(/\/Date\((.*?)\)\//, '$1')));
tovalue = new Date(parseInt(value.replace(/\/Date\((.*?)\)\//, '$1')));