In pure javascript, you can do this:
var date = new Date(Number("/Date(1460008501597)/".replace(/D/g, '')));
Explanation:
new Date(
Number(
"/Date(1460008501597)/".replace(/D/g, '') // Removes all non digit characters
) // Cast it to numeric
) // Creates a new Date object with the resultant number
Now, for more accurate solution for your problem, like display the date w/o javascript(which I think would be better choice), you can improve your question with more detail/information/code.
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