diff --git a/src/createCheckbox.ts b/src/createCheckbox.ts
index 6d66238..03f8a0e 100644
--- a/src/createCheckbox.ts
+++ b/src/createCheckbox.ts
@@ -22,7 +22,11 @@ const createCheckboxOfLine = (
 
   const dateNow = helpers.getDateString(new Date());
   const checkboxOfLine = helpers.getCheckboxOfLine(line);
-  const checkboxCharacters = dateWhenCreated ? `[ ] ${dateNow} ` : '[ ] ';
+  const hasDate = helpers
+    .getPlainLineText(line.text)
+    .match(/^\d{4}-\d{2}-\d{2} /);
+  const checkboxCharacters =
+    dateWhenCreated && !hasDate ? `[ ] ${dateNow} ` : '[ ] ';
 
   return editor.edit((editBuilder: TextEditorEdit) => {
     if (!checkboxOfLine) {
diff --git a/src/test/spec/checkbox/createCheckbox.spec.ts b/src/test/spec/checkbox/createCheckbox.spec.ts
index 154be0b..c6b80a7 100644
--- a/src/test/spec/checkbox/createCheckbox.spec.ts
+++ b/src/test/spec/checkbox/createCheckbox.spec.ts
@@ -173,4 +173,36 @@ describe('create checkboxes', () => {
 
     assert.strictEqual(content, expectedResult);
   });
+
+  it('should not insert creation date twice if exists', async () => {
+    // create new document
+    const newDocument = await vscode.workspace.openTextDocument({
+      content: '9999-99-99 this is a text',
+      language: 'markdown',
+    });
+    await vscode.window.showTextDocument(newDocument);
+
+    // update config to insert creation date if configured
+    await vscode.workspace
+      .getConfiguration('markdown-checkbox')
+      .update('dateWhenCreated', true);
+
+    // set the cursor to the current line
+    const editor = getEditor();
+    const position = editor.selection.active;
+    const newCursorPosition = position.with(0, 0);
+    const newSelection = new vscode.Selection(
+      newCursorPosition,
+      newCursorPosition
+    );
+    editor.selection = newSelection;
+
+    await createCheckbox(editor);
+
+    const content = editor.document.getText();
+    const typeOfBulletPoint = getConfig<string>('typeOfBulletPoint');
+    const expectedResult = `${typeOfBulletPoint} [ ] 9999-99-99 this is a text`;
+
+    assert.strictEqual(content, expectedResult);
+  });
 });