It was in ancient Rome. At that time, there was a kind of people who specialized in money lending business.
Go and collect interest from debtors. For the sake of convenience, they recorded the debts and interest paid by someone on a book on which month and day. Because this kind of notebook is based on the month as a unit, arranged by date, with a note column, its recording method is simple and clear, and it is gradually being used by other industries for reference.
After Mo Zaoquan, the second Chinese comprador of Hong Kong’s famous British businessman Tai Koo, took office, he built a sugar factory. In 1884, he launched a “month card” similar to a poster advertisement to promote Taikoo Sugar’s products. Mo Zaoquan specially hired designer Guan Huinong to design the pictures, the content mostly included flowers, auspicious characters, blessings, luck, longevity, joy, ancient Chinese heavenly officials’ blessings, greeting blessings in spring, and pictures of ladies. Those who purchase Taikoo Sugar will be given a frame of “Month Sign”. Later, many manufacturers rushed to print “month cards” for free, and continued to improve the form. With the passage of time, “debt collection” and “month card” have gradually evolved into today’s wall calendar.