A Dutch-format (perpetual) birthday calendar provides a means of listing the birthdays of friends and family. Its use is not limited to any individual calendar year, and can thus last a lifetime, which is probably why it is so popular amongst the Dutch!

The UnDutchables interpretation expands on this concept by adding additional entry lines to optimize spending decisions. Each page contains a unique and humorous color illustration that reflects on Dutch life during the subject month.

Sample illustrations from the Undutchables Birthday Calendar.
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