sort.js

var a = [0, 0, 1, 1, 1, 2, 2, 3, 4, 5, 5, 6, 6, 6]
var wday = 3;

console.log('wday', wday);

for (var i = 0; i < a.length; i++) {
  console.log('i',((a[i] + wday) % 7));
}

/*
 * Output:
 * i 3
 * i 3
 * i 4
 * i 4
 * i 4
 * i 5
 * i 5
 * i 6
 * i 0
 * i 1
 * i 1
 * i 2
 * i 2
 * i 2
 */