Date prototype getDay return error

[Pranab]

I tried in the console Date.prototype.getDay and it return the correct getDay function. but after doing this Date.prototype.getDay(), it return error.
Error is “Uncaught TypeError: this is not a Date object.”
Why it’s giving error?

[Xiija]

 var time = new Date();
 var wkday = [0,"sun",1,"mon",2,"tues",3,"wed",4,"thurs",5,"fri",6,"sat"]
 var check = time.getDay();
 console.log ( "today is " + wkday[check + 1] );

[Author]

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