calendar-matrix
Returns a two-dimensional array representing the days on a calendar
Accepts a year and month, or a Date instance, or no arguments, in which case the current date is used. Days from surrounding months are represented as negative numbers.
res = ;// orres = ;// orres = ; console; // outputs -28 -29 -30 -31 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31