Huawei's mobile phone calendar is one day different from Gregorian calendar and lunar calendar. What is the reason?

Well, hello, let me explain why. Of course it is them. They made a mistake when editing the calendar. I also found this problem. 20 13 There is no 30 in April of the lunar calendar, but there is an extra day in this calendar. Even the calendar can make mistakes. This technology sucks. . . It is this lunar April that is wrong one day, and May is missing 30 days, that is, that day in summer, which is 30 days in the lunar calendar and 29 days in the calendar. It is right to return to the lunar calendar. Answer over. Please give the best answer.