The first day of the 30-day period is the day after the County Board Order is "mailed" (the County Board Order may simply say "dated" or "issued" and not say "mailed".) The last day of the period-the 30th day-is included in the count, unless it falls on a Saturday, Sunday, or legal state holiday. Then, the 30-day period runs through the Saturday, Sunday, or legal state holiday to the next weekday. Remember that some months have 31 days, so you cannot assume, for example, that you have until June 18 to appeal a County Board Order that was mailed on May 18. If you do, you will be one day late, and the State Board cannot accept your appeal.