java 如何在java中获取给定月份的最小和最大日期
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how to get minimum and maximum date from given month in java
提问by Annu
how to get minimum and maximum date from given month in java using java.util.Calendar.
如何使用 java.util.Calendar 在 java 中获取给定月份的最小和最大日期。
回答by stacker
The minimum is always the 1st of this month. The maximum can be determined by adding 1 to month and subtracting 1 from the Calendar day field.
最小值始终是本月 1 日。最大值可以通过将月份加 1 并从日历日字段中减去 1 来确定。
回答by oiavorskyi
This could be done this way:
这可以通过这种方式完成：
c = ... // get calendar for month you're interested in
int numberOfDays = c.getActualMaximum(Calendar.DAY_OF_MONTH)
You could find minimum and maximum value the same way for any of components of the date.
您可以以相同的方式为日期的任何组成部分找到最小值和最大值。
回答by Ervi B
Have you tried the following?
您是否尝试过以下方法？
After setting your calendar object to your desired month,
calendar.getActualMaximum(Calendar.DATE);
将日历对象设置为所需的月份后，
calendar.getActualMaximum(Calendar.DATE);
For the minimum, I suppose it's always the first.
至少，我想它总是第一个。
Hope that helps.
希望有帮助。
回答by Imran
Minimum date is always 1 and Maximum date can be calculate as
最小日期始终为 1，最大日期可以计算为
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
int year = 2010;
int month = Calendar.FEBRUARY;
int date = 1;
int maxDay =0;
calendar.set(year, month, date);
System.out.println("First Day: " + formatter.format(calendar.getTime()));
//Getting Maximum day for Given Month
maxDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
calendar.set(year, month, maxDay);
System.out.println("Last Day: " + formatter.format(calendar.getTime()));
Hopefully this will helps
希望这会有所帮助
回答by Annu
I got solution as below,
我得到了如下解决方案，
public void ddl_month_valueChange(ValueChangeEvent event) {
int v_month = Integer.parseInt(event.getNewValue().toString()) - 1;
java.util.Calendar c1 = java.util.Calendar.getInstance();
c1.set(2011, v_month, 1);
Date d_set_att_from = c1.getTime();
cal_att_from_date.setValue(d_set_att_from);
c1.add(java.util.Calendar.MONTH, 1);
c1.add(java.util.Calendar.DATE, -1);
Date d_set_att_to = c1.getTime();
cal_att_to_date.setValue(d_set_att_to); }
