java 如何获取当前月份，上个月和两个月前
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How to get current month, previous month and two months ago
提问by Daniel Stoica
I need a function that will return three strings:
我需要一个返回三个字符串的函数：
- first string will contain the current month and the current year.
- second string will contain the previous month and current year.
- third string will contain two months ago and current year.
- 第一个字符串将包含当前月份和当前年份。
- 第二个字符串将包含上个月和当前年份。
- 第三个字符串将包含两个月前和当前年份。
This, of course, should also work if current month is January, for example.
当然，如果当前月份是一月，这也应该有效，例如。
So right now, the results should be:
所以现在，结果应该是：
- September 2015
- August 2015
- July 2015
- 2015 年 9 月
- 2015 年 8 月
- 2015 年 7 月
回答by Phylogenesis
A Java 8 version (using the java.time.YearMonthclass) is here.
Java 8 版本（使用java.time.YearMonth类）在这里。
YearMonth thisMonth = YearMonth.now();
YearMonth lastMonth = thisMonth.minusMonths(1);
YearMonth twoMonthsAgo = thisMonth.minusMonths(2);
DateTimeFormatter monthYearFormatter = DateTimeFormatter.ofPattern("MMMM yyyy");
System.out.printf("Today: %s\n", thisMonth.format(monthYearFormatter));
System.out.printf("Last Month: %s\n", lastMonth.format(monthYearFormatter));
System.out.printf("Two Months Ago: %s\n", twoMonthsAgo.format(monthYearFormatter));
This prints the following:
这将打印以下内容：
Today: September 2015
Last Month: August 2015
Two Months Ago: July 2015
今天：2015 年 9 月
上个月：2015 年 8 月
两个月前：2015 年 7 月
回答by Davide Lorenzo MARINO
Calendar c = new GregorianCalendar();
c.setTime(new Date());
SimpleDateFormat sdf = new SimpleDateFormat("MMMM YYYY");
System.out.println(sdf.format(c.getTime())); // NOW
c.add(Calendar.MONTH, -1);
System.out.println(sdf.format(c.getTime())); // One month ago
c.add(Calendar.MONTH, -1);
System.out.println(sdf.format(c.getTime())); // Two month ago
回答by CloudyMarble
回答by Pankaj Saboo
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public static void main(String[] args) {
Date currentDate = null;
String dateString = null;
try {
Calendar c = new GregorianCalendar();
c.set(Calendar.HOUR_OF_DAY, 0); // anything 0 - 23
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
//c.add(Calendar.MONTH, -1);//previous month
//c.add(Calendar.MONTH, -2);//two months back
currentDate = c.getTime(); // the midnight, that's the first second
// of the day.
SimpleDateFormat sdfr = new SimpleDateFormat("MMMM yyyy");
dateString = sdfr.format(currentDate);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(dateString); //prints current date
}
}
