diff --git a/packages/ui/components/form-core/src/validate/FileLastModifiedDateValidator.js b/packages/ui/components/form-core/src/validate/FileLastModifiedDateValidator.js
new file mode 100644
index 0000000000..4ca6f6a7cf
--- /dev/null
+++ b/packages/ui/components/form-core/src/validate/FileLastModifiedDateValidator.js
@@ -0,0 +1,33 @@
+import { Validator } from './Validator.js';
+
+export class FileLastModifiedDateValidator extends Validator {
+  static validatorName = 'FileLastModifiedDate';
+
+  /**
+   * Checks if the file's last modified date is within the specified range.
+   * @param {Date} fileLastModifiedDate - The file's last modified date.
+   * @param {Date} startDate - The start date of the allowed range.
+   * @param {Date} endDate - The end date of the allowed range.
+   * @returns {boolean}
+   */
+  static isDateWithinRange(fileLastModifiedDate, startDate, endDate) {
+    return fileLastModifiedDate >= startDate && fileLastModifiedDate <= endDate;
+  }
+
+  /**
+   * @param {Array<File>} modelValue - Array of file objects.
+   * @param {{ startDate: Date; endDate: Date; }} params - Validation parameters.
+   * @returns {boolean}
+   */
+  execute(modelValue, params = this.param) {
+    const ctor = /** @type {typeof FileLastModifiedDateValidator} */ (this.constructor);
+    return modelValue.every(file => {
+      const fileDate = new Date(file.lastModified);
+      return ctor.isDateWithinRange(fileDate, params.startDate, params.endDate);
+    });
+  }
+
+  static async getMessage() {
+    return 'The file must have been last modified within the specified date range.';
+  }
+}
diff --git a/packages/ui/components/form-core/test/validate/FileLastModifiedDateValidator.test.js b/packages/ui/components/form-core/test/validate/FileLastModifiedDateValidator.test.js
new file mode 100644
index 0000000000..93e6181bb9
--- /dev/null
+++ b/packages/ui/components/form-core/test/validate/FileLastModifiedDateValidator.test.js
@@ -0,0 +1,40 @@
+import { expect } from '@open-wc/testing';
+import { FileLastModifiedDateValidator } from '@lion/ui/FileLastModifiedDateValidator';
+
+describe('FileLastModifiedDateValidator', () => {
+  let validator;
+
+  beforeEach(() => {
+    validator = new FileLastModifiedDateValidator({
+      startDate: new Date('2022-01-01'),
+      endDate: new Date('2023-01-01'),
+    });
+  });
+
+  it('validates files within the specified date range', () => {
+    const validFile = new File(['content'], 'test.txt', {
+      type: 'text/plain',
+      lastModified: new Date('2022-06-01').getTime(),
+    });
+
+    const result = validator.execute([validFile]);
+    expect(result).to.be.true;
+  });
+
+  it('invalidates files outside the specified date range', () => {
+    const invalidFile = new File(['content'], 'test.txt', {
+      type: 'text/plain',
+      lastModified: new Date('2021-12-31').getTime(),
+    });
+
+    const result = validator.execute([invalidFile]);
+    expect(result).to.be.false;
+  });
+
+  it('returns a validation message for invalid files', async () => {
+    const message = await FileLastModifiedDateValidator.getMessage();
+    expect(message).to.equal(
+      'The file must have been last modified within the specified date range.',
+    );
+  });
+});
diff --git a/packages/ui/exports/form-core.js b/packages/ui/exports/form-core.js
index 05ed1e575d..81aa2a9f43 100644
--- a/packages/ui/exports/form-core.js
+++ b/packages/ui/exports/form-core.js
@@ -46,6 +46,7 @@ export {
 export { DefaultSuccess } from '../components/form-core/src/validate/resultValidators/DefaultSuccess.js';
 
 export { LionValidationFeedback } from '../components/form-core/src/validate/LionValidationFeedback.js';
+export { FileLastModifiedDateValidator } from '../components/form-core/src/validate/FileLastModifiedDateValidator.js';
 
 export { ChoiceGroupMixin } from '../components/form-core/src/choice-group/ChoiceGroupMixin.js';
 export { ChoiceInputMixin } from '../components/form-core/src/choice-group/ChoiceInputMixin.js';