Anyone who was previously employed can obtain an employment history by requesting a Social Security Earnings Information report from the Social Security Administration. The certified detailed earnings information includes employment or self-employment dates of the requester as well as the complete name and address of previous and current employers.
Locate previous W2 forms issued by former employers. The form includes the employee's yearly earning, compensation and the company's information that can be used to estimate the date of employment. Call the Human Resources Department of any previous company to check and verify the date of employment they have on record. It may also be worthwhile to inquire if the company issues a Certificate of Employment.