时钟/日历功能
在本节中：
sys_wClockCalendarHourMin
sys_wClockCalendarMinSec
sys_wClockCalendarDayHour
sys_wClockCalendarYearMonth
sys_wClockCalendarDayOfWeek
sys_iClockCalendarDayOfWeek
sys_wClockCalendarSet
sys_bIsClockCalendarError
sys_bIsSNTPTimeSynchFailure
sys_bIsSNTPTimeSynchCompleted
sys_iClockCalendarYear_2digits
sys_iClockCalendarMonth
sys_iClockCalendarDay
sys_iClockCalendarHour
sys_iClockCalendarMinute
sys_iClockCalendarSecond