When you have a response deadline and need to count the number of days involved, it’s handy to have a deadline calculator. Many websites offer these calculators, including http://www.deadlinecalculators.com/, which has two calculators: one to calculate a past or future date, and the other to calculate the difference between two dates. Unfortunately, this calculator does not take public holidays into account, although it does provide a list of those holidays in a link at the bottom of the page. Another site, http://www.timeanddate.com/date/weekdayadd.html?type=add, allows you to include holidays in your calculations, but does not have a calculator that determine the number of days between two dates.