When overridden in a derived class, determines whether a date is a leap day.
在衍生类别覆写时，判断某个日期是否为闰日。
When overridden in a derived class, determines whether a month is a leap month.
在衍生类别覆写时，判断某个月份是否为闰月。
When overridden in a derived class, determines whether a month is a leap month.
在衍生类别覆写时，判断某个月份是否为闰月。
应用推荐