javascript Date function is not working properly for me

Question

var d = new Date();
var hours = d.getHours();//hours is equal to the current hour
var min=d.getMinutes();
var sec=d.getSeconds();
var millisec=d.getMilliseconds();
var year=d.getFullYear();
var month=d.getMonth();
var date=d.getDate();
var day=d.getDay();
document.write(hours+":"+min+":"+sec+":"+millisec+" "+day+"/"+date+"/"+month+"/"+year);

output:
7:59:56:87 2/20/1/2018

day method is not working ,and mont method showing "1" and day method showing my current month

Answer 1

getDay() returns a number from 0-6(days of the week where 0 is Sunday)
getDate() returns a number from 1-31(day of the month)
getMonth() returns a number from 0-11(months of the year where 0 is January) .

The code is fine.

For better reference:
https://www.w3schools.com/jsref/jsref_obj_date.asp

Answer 2

ok , something wrong with the month,may be it's my system problem , thanks for answering . now I understand the output..