我如何获得31天前的日期? [英] How do I get the date of 31 days ago?

问题描述

我应该如何获取x，该时间应该早于current_date 31天?

How can I get x which should be 31 days before current_date?

x(date)___________________________current_date
                       31 

推荐答案

只需减去31天.例如:

Just subtract 31 days. For example:

LocalDate current = new LocalDate(2015, 6, 19);
LocalDate x = current.minusDays(31); // 2015-05-19

要获取当前日期，可以使用:

To get the current date, you could use:

LocalDate current = new LocalDate(); // Default time zone

或

LocalDate current = new LocalDate(zone); // Some specific zone

或者您可能想要创建自己的时钟"表示形式，以便为您提供当前的Instant，在这种情况下，您将使用:

Or you may want to create your own "clock" representation which is able to give you the current Instant, in which case you'd use:

LocalDate current = clock.getCurrentInstant().toDateTime(zone).toLocalDate();

(这使您可以使用依赖注入来使用伪造的时钟编写更简单的单元测试.)

(That lets you use dependency injection to write simpler unit tests with a fake clock.)

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