使用日期[duplicate]获取昨天的日期(Get yesterday's date using Date [duplicate])

使用日期[duplicate]获取昨天的日期(Get yesterday's date using Date [duplicate])

这个问题已经在这里有一个答案：

如何检查日期对象是否等于昨天？ 8答案

以下功能生成今天的日期; 如何才能让它只在昨天的日期生产？

private String toDate() { DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); Date date = new Date(); return dateFormat.format(date).toString(); }

这是输出：

2012-07-10

我只需要昨天的日期如下。 有可能在我的功能吗？

2012-07-09

This question already has an answer here:

How to check if a date Object equals yesterday? 8 answers

The following function produces today's date; how can I make it produce only yesterday's date?

private String toDate() { DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); Date date = new Date(); return dateFormat.format(date).toString(); }

This is the output:

2012-07-10

I only need yesterday's date like below. Is it possible to do this in my function?

2012-07-09

最满意答案

你减去错误的数字：

改用Calendar

private Date yesterday() { final Calendar cal = Calendar.getInstance(); cal.add(Calendar.DATE, -1); return cal.getTime(); }

然后，将您的方法修改为以下内容：

private String getYesterdayDateString() { DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); return dateFormat.format(yesterday()); }

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看到

IDEOne演示

You are subtracting the wrong number:

Use Calendar instead:

private Date yesterday() { final Calendar cal = Calendar.getInstance(); cal.add(Calendar.DATE, -1); return cal.getTime(); }

Then, modify your method to the following:

private String getYesterdayDateString() { DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); return dateFormat.format(yesterday()); }

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See

IDEOne Demo