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[英]SimpleDateFormat for past month, two months ago, three months ago
[英]How to get current month, previous month and two months ago
我需要一个返回三个字符串的函数:
当然,例如,如果当前月份是 1 月,这也应该有效。
所以现在,结果应该是:
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));
这将打印以下内容:
今天:2015 年 9 月
上个月:2015 年 8 月
两个月前:2015 年 7 月
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
下面是一个使用 Kotlin 编写的LocalDate
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
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
}
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