Abit late, but in case it helps anyone else - I was having the same problem and have figured it out. Using the pop-up date picker you choose your start date, then when you pick the finish date, if you're like me you assume Zencart has kept the year but it hasn't, it defaults to the start of it's list: 2002, so when you pick the rest of your date you're picking a finish date in the past, Zencart won't allow this so defaults to 2036 instead. Just remember to set the year for the finish date and it works.
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