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# FCC Friendly Date Ranges Algorithm

a guest Aug 30th, 2016 81 Never
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1.
2. function makeFriendlyDates(arr) {
3.   var months = ["January", "Febraury", "March", "April",
4.                "May", "June", "July", "August",
5.                "September", "October", "November", "December"];
6.
7.   function ordinal(num){
8.     var end = "th";
9.     if (num % 10 == 1){
10.       end = "st";
11.     }else if (num % 10 == 2){
12.       end = "nd";
13.     }else if (num % 10 == 3 && num != 13){
14.       end = "rd";
15.     }
16.     return num + end;
17.   }
18.
19.   var result = [];
20.   var one = arr[0].split('-');
21.   var two = arr[1].split('-');
22.   for (var i = 0; i<one.length; i++){
23.     one[i] = parseInt(one[i]);
24.   }
25.   for (var j = 0; j<two.length; j++){
26.     two[j] = parseInt(two[j]);
27.   }
28.
29.   //year, month, day
30.
31.   var date1 = new Date(one[0], one[1] - 1, one[2]);
32.   var date2 = new Date(two[0], two[1] - 1, two[2]);
33.
34.   //used for testing
35.   //date1 = new Date(2022, 9 - 1, 5);
36.   //date2 = new Date(2023, 9 - 1, 4);
37.
38.   var month2 = date2.getUTCFullYear()*12 + date2.getUTCMonth();
39.   var month1 = date1.getUTCFullYear()*12 + date1.getUTCMonth();
40.
41.   var dayDiff = Math.abs(date2.getUTCDate() - date1.getUTCDate());
42.   var monthDiff = month2 - month1;
43.   var yearDiff = date2.getUTCFullYear() - date1.getUTCFullYear();
44.
45.   //same day
46.   if (dayDiff === 0 && monthDiff === 0 && yearDiff === 0){
47.     return [months[date1.getUTCMonth()] + " " + ordinal(date1.getUTCDate()) + ", " +
48.       date1.getUTCFullYear()];
49.   }else if (monthDiff === 0 && date1.getUTCFullYear() == date2.getUTCFullYear()){
50.     //less than 12 months and same month and same year
51.     result.push(months[date1.getUTCMonth()] + " " + ordinal(date1.getUTCDate()));
52.     result.push(ordinal(date2.getUTCDate()));
53.     return result;
54.   }else if (monthDiff < 12 && date1.getUTCFullYear() == date2.getUTCFullYear()){
55.     //less than 12 months and same year
56.     result.push(months[date1.getUTCMonth()] + " " + ordinal(date1.getUTCDate()) + ", " +
57.       date1.getUTCFullYear());
58.     result.push(months[date2.getUTCMonth()] + " " + ordinal(date2.getUTCDate()));
59.     return result;
60.   }else if (monthDiff < 12){
61.     //less than 12 months
62.     result.push(months[date1.getUTCMonth()] + " " + ordinal(date1.getUTCDate()));
63.     result.push(months[date2.getUTCMonth()] + " " + ordinal(date2.getUTCDate()));
64.     return result;
65.   }else if (yearDiff == 1 && monthDiff == 12 && date1.getUTCDate() > date2.getUTCDate()){
66.     result.push(months[date1.getUTCMonth()] + " " + ordinal(date1.getUTCDate()) + ", " +
67.       date1.getUTCFullYear());
68.     result.push(months[date2.getUTCMonth()] + " " + ordinal(date2.getUTCDate()));
69.     return result;
70.   }else if (yearDiff >= 1){
71.     result.push(months[date1.getUTCMonth()] + " " + ordinal(date1.getUTCDate()) + ", " +
72.       date1.getUTCFullYear());
73.     result.push(months[date2.getUTCMonth()] + " " + ordinal(date2.getUTCDate()) + ", " +
74.       date2.getUTCFullYear());
75.     return result;
76.   }
77.
78. }
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