date isssue in javascript need help

Question

var NewFDate = new Date(2017, 01, 31);

 

its giveing me out put as NewFDate =  Fri Mar 03 2017 00:00:00 GMT+0530 (India Standard Time)

but i need tue  jan 31 2017  

 

 

var NewTDate = new Date(2017, 02, 2);

 

 

its giveing me out put as NewTDate =Thu Mar 02 2017 00:00:00 GMT+0530 (India Standard Time)

 

 but i need tue feb 02 2017

 why i a getting wrong date