feat: ✨ add getDayOfYear functionality

thkruz · Aug 24, 2022 · 46ffa20 · 46ffa20
1 parent cbfd7e4
commit 46ffa20
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diff --git a/src/utils/utils.ts b/src/utils/utils.ts
@@ -90,6 +90,32 @@ class Utils {
     );
   };
 
+  public static getDayOfYear(date: Date): number {
+    date = date || new Date();
+
+    const dayCount = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
+    const mn = date.getMonth();
+    const dn = date.getUTCDate();
+    let dayOfYear = dayCount[mn] + dn;
+
+    if (mn > 1 && Utils.isLeapYear(date)) {
+      dayOfYear++;
+    }
+
+    return dayOfYear;
+  }
+
+  private static isLeapYear(dateIn: Date) {
+    const year = dateIn.getUTCFullYear();
+
+    // eslint-disable-next-line no-bitwise
+    if ((year & 3) !== 0) {
+      return false;
+    }
+
+    return year % 100 !== 0 || year % 400 === 0;
+  }
+
   public static roundToNDecimalPlaces(value: number, places: number): number {
     return Math.round(value * 10 ** places) / 10 ** places;
   }

diff --git a/test/utils/utils.test.js b/test/utils/utils.test.js
@@ -110,3 +110,35 @@ describe('Create Vector Function', () => {
     expect(Utils.createVec(1, 10, 2)).toEqual([1, 3, 5, 7, 9]);
   });
 });
+
+describe('doy Functions', () => {
+  test('if doy is correct', () => {
+    expect(Utils.getDayOfYear(new Date(2022, 0, 1))).toEqual(1);
+    expect(Utils.getDayOfYear(new Date(2022, 1, 1))).toEqual(32);
+    expect(Utils.getDayOfYear(new Date(2022, 2, 1))).toEqual(60);
+    expect(Utils.getDayOfYear(new Date(2022, 3, 1))).toEqual(91);
+    expect(Utils.getDayOfYear(new Date(2022, 4, 1))).toEqual(121);
+    expect(Utils.getDayOfYear(new Date(2022, 5, 1))).toEqual(152);
+    expect(Utils.getDayOfYear(new Date(2022, 6, 1))).toEqual(182);
+    expect(Utils.getDayOfYear(new Date(2022, 7, 1))).toEqual(213);
+    expect(Utils.getDayOfYear(new Date(2022, 8, 1))).toEqual(244);
+    expect(Utils.getDayOfYear(new Date(2022, 9, 1))).toEqual(274);
+    expect(Utils.getDayOfYear(new Date(2022, 10, 1))).toEqual(305);
+    expect(Utils.getDayOfYear(new Date(2022, 11, 1))).toEqual(335);
+  });
+
+  test('if getDayOfYear is correct in leap year', () => {
+    expect(Utils.getDayOfYear(new Date(2020, 0, 1, 0))).toEqual(1);
+    expect(Utils.getDayOfYear(new Date(2020, 1, 1, 0))).toEqual(32);
+    expect(Utils.getDayOfYear(new Date(2020, 2, 1, 0))).toEqual(61);
+    expect(Utils.getDayOfYear(new Date(2020, 3, 1, 0))).toEqual(92);
+    expect(Utils.getDayOfYear(new Date(2020, 4, 1, 0))).toEqual(122);
+    expect(Utils.getDayOfYear(new Date(2020, 5, 1, 0))).toEqual(153);
+    expect(Utils.getDayOfYear(new Date(2020, 6, 1, 0))).toEqual(183);
+    expect(Utils.getDayOfYear(new Date(2020, 7, 1, 0))).toEqual(214);
+    expect(Utils.getDayOfYear(new Date(2020, 8, 1, 0))).toEqual(245);
+    expect(Utils.getDayOfYear(new Date(2020, 9, 1, 0))).toEqual(275);
+    expect(Utils.getDayOfYear(new Date(2020, 10, 1, 0))).toEqual(306);
+    expect(Utils.getDayOfYear(new Date(2020, 11, 1, 0))).toEqual(336);
+  });
+});