在调试过程中由于水平有限，可能有隐含的问题并未能在此次的实验中表现出来，要求完成多时区切换，但由于本人能力有限未能做出，制作出了单一时区的倒计时，由于计算时为严格按照各个月份天数不同及闰年与非闰年差别，在计算倒计时间时不够严谨-In the debugging process because of the limited level, there may be hidden problems and unable in this experiment shown, required to complete a long time of handover, but because I failed to make a limited capacity, to produce a single time zone, countdown , because the calculation is in strict accordance with the different number of days each month and leap years and non-leap year difference when calculating the remaining time is not stringent enough