This paper mainly introduces the software and hardware design of multifunctional electronic calendar based on STC89C52. This design is mainly composed of temperature acquisition module, display module, adjustment and setting module and time processing module. The main controller of the system is STC89C52 single chip microcomputer, which records the calendar and time with the serial clock and calendar chip DS1302. It can time the year, month, day, hour, minute and second. In addition, it also has many practical functions such as leap year compensation. The calendar uses a more intuitive digital display, the data display uses 1602 LCD module, and the temperature acquisition uses DS18B20 chip. It can simultaneously display year, month, week, day, hour, minute and second on LCD1602, and has the function of time calibration. The calendar has the advantages of easy reading, various functions, intuitive display and high cost performance. As a tool with a wide range of applications in daily life, the electronic multi-functional calendar has a broad market prospect.<br>
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