如何获取当前月份、上个月和两个月前

Question

我需要一个函数来 return 三个字符串：

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前一个月和当前年份。
第三个字符串将包含两个月前和当年。

当然，如果当前月份是 1 月，这也应该有效，例如。

所以现在，结果应该是：

2015 年 9 月
2015 年 8 月
2015 年 7 月

Answer 1

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

Answer 2

获取您需要的月份（当前、当前 -1 和当前 -2）请参阅 here
获取月份的文本形式，如图所示here

Answer 3

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

}

Answer 4

A Java 8 版本（使用 java.time.YearMonth class) is here.

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));

这将打印以下内容：

Today: September 2015

Last Month: August 2015

Two Months Ago: July 2015

Answer 5

下面是使用 LocalDate 用 Kotlin 编写的示例。

import java.time.LocalDate
import java.time.format.TextStyle
import java.util.Locale

val currentMonth = LocalDate.now().month.getDisplayName(TextStyle.FULL, Locale.getDefault()) //February
val prevMonth = LocalDate.now().minusMonths(1).getDisplayName(TextStyle.FULL, Locale.getDefault()) //January
val twoMonthsAgo = LocalDate.now().minusMonths(2) //DECEMBER

如何获取当前月份、上个月和两个月前

How to get current month, previous month and two months ago

java