Wrong week number

[KevinHerklotz]

Example for Jan 05 2016:

var isoWeek = require('iso-week');
console.log(isoWeek(new Date(2016,0,5)));

outputs 2 but expected output is 1
See here: Link

[KevinHerklotz]

by the way: here you can find a function called isoWeek that works for me.

And your test should test for moment().isoWeek();