两个是且的关系,因此对应代码 (year%100==0 && year%400!=0) 上面a,b两种情况是“或”的关系,也就是满足其中之一就不是闰年。 如何理解ytd和mtd指标ytd(year to date)和 mtd(month to date)是两个在财务分析和业务管理中常用的时间周期指标,理解如下:一、ytd(year to date)定.

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