diff --git a/__tests__/git.test.ts b/__tests__/git.test.ts
index 8beb864..b562802 100644
--- a/__tests__/git.test.ts
+++ b/__tests__/git.test.ts
@@ -279,3 +279,10 @@ describe('tag', () => {
     });
   });
 });
+
+describe('getCommitDate', () => {
+  it('head', async () => {
+    const date = await Git.commitDate('HEAD');
+    await expect(date).toBeInstanceOf(Date);
+  });
+});
diff --git a/src/git.ts b/src/git.ts
index 33d89c0..b2c7595 100644
--- a/src/git.ts
+++ b/src/git.ts
@@ -163,4 +163,8 @@ export class Git {
       return res.stdout.trim();
     });
   }
+
+  public static async commitDate(ref: string): Promise<Date> {
+    return new Date(await Git.exec(['show', '-s', '--format="%ci"', ref]));
+  }
 }