Solution

.github/workflows/test.yml-template

@@ -0,0 +1,23 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm install
+    - run: npm test

package.json

@@ -17,7 +17,7 @@
   "license": "GPL-3.0",
   "devDependencies": {
     "@mate-academy/eslint-config": "latest",
-    "@mate-academy/scripts": "^1.8.6",
+    "@mate-academy/scripts": "^2.1.3",
     "eslint": "^8.57.0",
     "eslint-plugin-jest": "^28.6.0",
     "eslint-plugin-node": "^11.1.0",

src/formatDate.js

@@ -9,6 +9,43 @@
  */
 function formatDate(date, fromFormat, toFormat) {
   // write code here
+  const arrDate = date.split(fromFormat.at(-1));
+  const parts = {};
+  const resArr = [];
+
+  for (let i = 0; i < arrDate.length; i++) {
+    parts[fromFormat[i]] = arrDate[i];
+  }
+
+  for (let j = 0; j < toFormat.length - 1; j++) {
+    if (
+      (fromFormat.includes('YYYY') && toFormat[j] === 'YY') ||
+      (fromFormat.includes('YY') && toFormat[j] === 'YYYY')
+    ) {
+      const changedYear = normalizeYear(parts, toFormat[j]);
+
+      resArr.push(changedYear);
+      continue;
+    }
+
+    resArr.push(parts[toFormat[j]]);
+  }
+
+  return resArr.join(toFormat.at(-1));
+}
+
+function normalizeYear(obj, targetYearFormat) {
+  if (targetYearFormat !== 'YY' && targetYearFormat !== 'YYYY') {
+    throw new Error('Unsupported year format');
+  }
+
+  if (targetYearFormat === 'YYYY') {
+    return obj.YY >= 30 ? '19' + obj.YY : '20' + obj.YY;
+  }
+
+  if (targetYearFormat === 'YY') {
+    return obj.YYYY.slice(-2);
+  }
 }
 
 module.exports = formatDate;