Duration类型

Duration - 无创建接口,会在Integer类型数据调用日期/时间类型数据时返回

定义Duration:<Integer>.years;

                        <Integer>.months;

                        <Integer>.days;

                       <Integer>.hours;

                       <Integer>.minutes;

例:

>     Date date = "2019-01-01"

>     date = date + 1.months //返回:2019-02-01
2022-08-09
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