The TBC Newsletter
will keep you periodically up-to-date on what is happening at The Baseball Cube.
There is a birthdays section on the site that shows you birthdays for the current day as well as for any day of the year. You can also see birth dates on a given date in history through the "This Day in Baseball" section under the Boxscores.
The birthdate is obviously derived through the inclusion of the player's birth date, often referred to as Born Date on the site. The birth date can be expressed as an actual date or as a year. The year will be either accurate or guessed. For College players, birth dates are often not available in data sources and so the estimated year of birth will be determined based on the college player's class (Freshman,Sophomore,Junior,Senior). The idea though is that no actual birthdays will be guessed though certainly at times, they can be incorrect.