java 如何在没有日历的情况下向日期添加月份？
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how to add months to the date without Calendar?
提问by Naoj
I'm now developing gwt project that want to add month to the given date. gwt doesn't support Calendar class so how can I do this ? Date is in "dd.MM.yyyy"format
我现在正在开发想要在给定日期添加月份的 gwt 项目。gwt 不支持 Calendar 类，所以我该怎么做？日期是"dd.MM.yyyy"格式
public Date addMonth(Date d, int months){
}
mine implementation is so long that I need help. Thanks
我的实施时间太长了，我需要帮助。谢谢
[EDIT]
[编辑]
addMonth() means just add months to the given date's month. If it is 01.06.2010adding 4 months is 01.10.2010
addMonth() 表示只在给定日期的月份添加月份。如果01.06.2010增加 4 个月是01.10.2010
for 31 Jan and add 1 it will 28. Feb
1 月 31 日加上 1 将是 28. 二月
回答by Naoj
you can use CalendarUtil
你可以使用 CalendarUtil
import com.google.gwt.user.datepicker.client.CalendarUtil;
...
// Now
Date d = new Date();
// Now + 2 months
CalendarUtil.addMonthsToDate(d, 2);
回答by keuleJ
回答by CoolBeans
How about this? Ofcourse you will have to refine this based on how many days in a month and stuff but you get the basic idea. I am not familiar with gwt but I assumed it doesn't support joda time.
这个怎么样？当然，您必须根据一个月中的天数等来完善它，但您会了解基本概念。我不熟悉 gwt，但我认为它不支持 joda 时间。
This is a rather crude solution. But without using the Calendar class or joda-time this is the only way I can think of for now.
这是一个相当粗糙的解决方案。但是不使用 Calendar 类或 joda-time 这是我现在能想到的唯一方法。
Date date = new Date();
SimpleDateFormat df = new SimpleDateFormat("dd.MM.yyyy"); //today is 02.02.2011
Date baseDate = null;
try {
baseDate = df.parse(df.format(date));
} catch (ParseException e) {
e.printStackTrace();
}
long oneMonthTime = baseDate.getTime()+30*24*60*60; //30 should change based on which month you are on
System.out.println(df.format(oneMonthTime)); //prints 03.02.2011
