Abstract: An automatic timekeeping and accounting unit is provided which has particular utility for use by professional persons such as lawyers, accountants, and the like. The unit of the invention keeps track of the person's working activities during the day, and it also serves to record the time and subject matter of interrupting telephone calls, if the user so desires, along with information relating to other work activities. The unit to be described also includes a simple switch which converts the unit into an electronic calculator for performing additions, divisions, subtractions, multiplications, and other calculations, similar to the commercially available solid state pocket calculators, without affecting its timing capabilities.