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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.
