Does a company have the right to publish my birthdate without my permission in an online time clock program that 2583 contractors have access to?

This research company which has 2583 people, the majority of which are contractors such as myself use an application to login and logout to keep track of our hours. Our jobs are virtual and all of our work is done online. There is a an area in the dashboard of the application entitled Birthday Alerts that tell you the name of the contractor and the birthdate, in month and day, omitting the year. I did not consent to the use of my birthdate, partial or in full and do not want that information publicized as I see it as just more information that can add to possible identity theft. It has nothing to do with tracking our hours, payroll, or anything to my knowledge. If I am within my right to demand they remove my information from that list I intend to do so. Is there some unknown employment law that gives them the right to do this? The headquarters is in the state of Utah. I am a Washington DC resident.