Trying to word a message to employees about tardiness?

Staff gets sick and personal days but we are starting a new policy for excessive tardiness. The plan is to total the time of late arrivals and that time will be considered a personal day. I am letting them know I am documenting late arrivals and the acumulatedly time will be.... I m stuck there. Help!
Update: It is salaried employees. We do not have a time clock. We are a small preschool. One employees is habitual tardy. Any other job she woulld be fired but that would really put us in a tight spot.
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