This legislation, titled the "Federal Retirement Fairness Act," significantly alters the criteria for creditable service under the Federal Employees Retirement System (FERS). It specifically amends title 5, United States Code, to eliminate the previous restriction that only temporary civilian service performed before January 1, 1989, could be counted towards FERS retirement benefits. By striking this date, the bill allows individuals who served in temporary positions after December 31, 1988, to potentially count that time as creditable service. This change applies to any individual who is an employee (including temporary employees of the United States Postal Service) or a Member on or after the date of enactment. The Office of Personnel Management (OPM) is mandated to notify agency Chief Human Capital Officers to inform eligible employees and Members about their ability to make deposits for this newly creditable service and is also required to promulgate regulations to carry out the Act's provisions.