anyone with a watch might not have one after a emp.but yet,mainly if the clock and/or watch has any electronics of any kind..what will you do,if you want to keep up with the time? or keep up with the month date and year?as for me.i won't be to concerned about the time of day to much,if at all.but im thinking that it'd be nice to keep up with the month/date and year.and thats why im thinking of getting a wooden calender where the months and dates can be changed out.