diff --git a/src/shared/lib/formatDate.test.ts b/src/shared/lib/formatDate.test.ts
new file mode 100644
index 0000000..02ff72e
--- /dev/null
+++ b/src/shared/lib/formatDate.test.ts
@@ -0,0 +1,48 @@
+import { describe, expect, it } from 'vitest';
+import { formatYearRange } from './formatDate';
+
+describe('formatYearRange', () => {
+  describe('Success Paths', () => {
+    it('formats a date range within the same year', () => {
+      const start = '2024-01-01 12:00:00.000Z';
+      const end = '2024-12-31 12:00:00.000Z';
+      expect(formatYearRange(start, end)).toBe('2024');
+    });
+
+    it('formats a range between different years', () => {
+      const start = '2021-05-15 12:00:00.000Z';
+      const end = '2024-03-20 12:00:00.000Z';
+      expect(formatYearRange(start, end)).toBe('2021 — 2024');
+    });
+
+    it('formats a range with null end date as "Present"', () => {
+      const start = '2022-08-01 12:00:00.000Z';
+      const end = null;
+      expect(formatYearRange(start, end)).toBe('2022 — Present');
+    });
+  });
+
+  describe('Error & Edge Cases', () => {
+    it('throws if start date is invalid', () => {
+      const start = 'not-a-date';
+      const end = '2024-01-01';
+      expect(() => formatYearRange(start, end)).toThrow('Invalid start date');
+    });
+
+    it('throws if end date is provided but invalid', () => {
+      const start = '2024-01-01';
+      const end = 'invalid';
+      expect(() => formatYearRange(start, end)).toThrow('Invalid end date');
+    });
+
+    it('throws if start year is after end year', () => {
+      const start = '2024-01-01';
+      const end = '2020-01-01';
+      expect(() => formatYearRange(start, end)).toThrow('Start year cannot be after end year');
+    });
+
+    it('handles empty strings by throwing', () => {
+      expect(() => formatYearRange('', null)).toThrow('Invalid start date');
+    });
+  });
+});
diff --git a/src/shared/lib/formatDate.ts b/src/shared/lib/formatDate.ts
new file mode 100644
index 0000000..4fc97df
--- /dev/null
+++ b/src/shared/lib/formatDate.ts
@@ -0,0 +1,31 @@
+/**
+ * Formats a PocketBase date string into a localized year string or "Present".
+ * @throws {Error} if any date is invalid or if the range is logically impossible.
+ */
+export function formatYearRange(start: string, end: string | null): string {
+  const startDate = new Date(start);
+  if (Number.isNaN(startDate.getTime())) {
+    throw new Error('Invalid start date');
+  }
+  const startYear = startDate.getFullYear();
+
+  if (end === null) {
+    return `${startYear} — Present`;
+  }
+
+  const endDate = new Date(end);
+  if (Number.isNaN(endDate.getTime())) {
+    throw new Error('Invalid end date');
+  }
+  const endYear = endDate.getFullYear();
+
+  if (startYear > endYear) {
+    throw new Error('Start year cannot be after end year');
+  }
+
+  if (startYear === endYear) {
+    return `${startYear}`;
+  }
+
+  return `${startYear} — ${endYear}`;
+}
diff --git a/src/shared/lib/index.ts b/src/shared/lib/index.ts
index a914abd..e8331fc 100644
--- a/src/shared/lib/index.ts
+++ b/src/shared/lib/index.ts
@@ -1,3 +1,4 @@
-export { cn } from './cn';
 export type { ClassValue } from 'clsx';
+export { cn } from './cn';
 export * from './fonts';
+export * from './formatDate';
diff --git a/src/shared/ui/index.ts b/src/shared/ui/index.ts
index 2c4ac10..586af4f 100644
--- a/src/shared/ui/index.ts
+++ b/src/shared/ui/index.ts
@@ -1,17 +1,12 @@
-export { Badge } from './Badge';
 export type { BadgeVariant } from './Badge';
-
+export { Badge } from './Badge';
+export type { ButtonSize, ButtonVariant } from './Button';
 export { Button } from './Button';
-export type { ButtonVariant, ButtonSize } from './Button';
-
-export { Card, CardHeader, CardTitle, CardDescription, CardContent, CardFooter } from './Card';
 export type { CardBackground } from './Card';
+export { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from './Card';
 
 export { Input, Textarea } from './Input';
-
-export { Section, Container } from './Section';
-export type { SectionBackground, ContainerSize } from './Section';
-
-export { SectionAccordion } from './SectionAccordion';
+export type { ContainerSize, SectionBackground } from './Section';
+export { Container, Section } from './Section';
 
 export { TechStackBrick, TechStackGrid } from './TechStack';
diff --git a/src/test/__mocks__/next-font-google.ts b/src/test/__mocks__/next-font-google.ts
new file mode 100644
index 0000000..9c99157
--- /dev/null
+++ b/src/test/__mocks__/next-font-google.ts
@@ -0,0 +1,12 @@
+import { vi } from 'vitest';
+
+const mockFont = () => ({
+  variable: '--font-mock',
+  className: 'mock-font',
+  style: { fontFamily: 'mock-font' },
+});
+
+vi.mock('next/font/google', () => ({
+  Fraunces: mockFont,
+  Public_Sans: mockFont,
+}));
diff --git a/src/test/setup.ts b/src/test/setup.ts
index 7b0828b..b166ee9 100644
--- a/src/test/setup.ts
+++ b/src/test/setup.ts
@@ -1 +1,2 @@
 import '@testing-library/jest-dom';
+import './__mocks__/next-font-google';