In Java how can I add one month to the current date?
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, 1);
爪哇 8
LocalDate futureDate = LocalDate.now().plusMonths(1);
You can make use of apache's commons lang DateUtils helper utility class.
Date newDate = DateUtils.addMonths(new Date(), 1);
You can download commons lang jar at http://commons.apache.org/proper/commons-lang/
LocalDate::plusMonths
Example:
LocalDate.now( )
.plusMonths( 1 );
Better to specify time zone.
LocalDate.now( ZoneId.of( "America/Montreal" )
.plusMonths( 1 );
The java.time framework is built into Java 8 and later. These classes supplant the old troublesome date-time classes such as java.util.Date
, .Calendar
, & java.text.SimpleDateFormat
. The Joda-Time team also advises migration to java.time.
To learn more, see the Oracle Tutorial . And search Stack Overflow for many examples and explanations.
Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP .
If you want the date-only, use the LocalDate
class.
ZoneId z = ZoneId.of( "America/Montreal" );
LocalDate today = LocalDate.now( z );
today.toString(): 2017-01-23
Add a month.
LocalDate oneMonthLater = today.plusMonths( 1 );
oneMonthLater.toString(): 2017-02-23
Perhaps you want a time-of-day along with the date.
First get the current moment in UTC with a resolution of nanoseconds .
Instant instant = Instant.now();
Adding a month means determining dates. And determining dates means applying a time zone. For any given moment, the date varies around the world with a new day dawning earlier to the east. So adjust that Instant
into a time zone.
ZoneId zoneId = ZoneId.of( "America/Montreal" );
ZonedDateTime zdt = ZonedDateTime.ofInstant( instant , zoneId );
Now add your month. Let java.time handle Leap month, and the fact that months vary in length.
ZonedDateTime zdtMonthLater = zdt.plusMonths( 1 );
You might want to adjust the time-of-day to the first moment of the day when making this kind of calculation. That first moment is not always 00:00:00.0
so let java.time determine the time-of-day.
ZonedDateTime zdtMonthLaterStartOfDay = zdtMonthLater.toLocalDate().atStartOfDay( zoneId );
The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date
, Calendar
, & SimpleDateFormat
.
To learn more, see the Oracle Tutorial . And search Stack Overflow for many examples and explanations. Specification is JSR 310 .
The Joda-Time project, now in maintenance mode , advises migration to the java.time classes.
You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.*
classes. Hibernate 5 & JPA 2.2 support java.time .
Where to obtain the java.time classes?
Update: The Joda-Time project is now in maintenance mode. Its team advises migration to the java.time classes. I am leaving this section intact for posterity.
The Joda-Time library offers a method to add months in a smart way.
DateTimeZone timeZone = DateTimeZone.forID( "Europe/Paris" );
DateTime now = DateTime.now( timeZone );
DateTime nextMonth = now.plusMonths( 1 );
You might want to focus on the day by adjust the time-of-day to the first moment of the day.
DateTime nextMonth = now.plusMonths( 1 ).withTimeAtStartOfDay();
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, 1);
java.util.Date dt = cal.getTime();
(adapted from Duggu)
public static Date addOneMonth(Date date)
{
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(Calendar.MONTH, 1);
return cal.getTime();
}
Use calander and try this code.
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
Date nextMonthFirstDay = calendar.getTime();
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
Date nextMonthLastDay = calendar.getTime();
您可以使用 org.apache.commons.lang3.time 包中的 DateUtils 类
DateUtils.addMonths(new Date(),1);
public Date addMonths(String dateAsString, int nbMonths) throws ParseException {
String format = "MM/dd/yyyy" ;
SimpleDateFormat sdf = new SimpleDateFormat(format) ;
Date dateAsObj = sdf.parse(dateAsString) ;
Calendar cal = Calendar.getInstance();
cal.setTime(dateAsObj);
cal.add(Calendar.MONTH, nbMonths);
Date dateAsObjAfterAMonth = cal.getTime() ;
System.out.println(sdf.format(dateAsObjAfterAMonth));
return dateAsObjAfterAMonth ;
}`
如果您需要一个单行(即 Jasper Reports 公式)并且不介意调整是否不完全是一个月(即“30 天”就足够了):
new Date($F{invoicedate}.getTime() + 30L * 24L * 60L * 60L * 1000L)
This method returns the current date plus 1 month.
public Date addOneMonth() {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, 1);
return cal.getTime();
}`
In order to find the day after one month, it is necessary to look at what day of the month it is today.
So if the day is first day of month run following code
Calendar calendar = Calendar.getInstance();
Calendar calFebruary = Calendar.getInstance();
calFebruary.set(Calendar.MONTH, Calendar.FEBRUARY);
if (calendar.get(Calendar.DAY_OF_MONTH) == 1) {// if first day of month
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
Date nextMonthFirstDay = calendar.getTime();
System.out.println(nextMonthFirstDay);
}
if the day is last day of month, run following codes.
else if ((calendar.getActualMaximum(Calendar.DAY_OF_MONTH) == calendar.get(Calendar.DAY_OF_MONTH))) {// if last day of month
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
Date nextMonthLastDay = calendar.getTime();
System.out.println(nextMonthLastDay);
}
if the day is in february run following code
else if (calendar.get(Calendar.MONTH) == Calendar.JANUARY
&& calendar.get(Calendar.DAY_OF_MONTH) > calFebruary.getActualMaximum(Calendar.DAY_OF_MONTH)) {// control of february
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
Date nextMonthLastDay = calendar.getTime();
System.out.println(nextMonthLastDay);
}
the following codes are used for other cases.
else { // any day
calendar.add(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
Date theNextDate = calendar.getTime();
System.out.println(theNextDate);
}
You can use like this;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String d = "2000-01-30";
Date date= new Date(sdf.parse(d).getTime());
date.setMonth(date.getMonth() + 1);
Date dateAfterOneMonth = new DateTime(System.currentTimeMillis()).plusMonths(1).toDate();
Use the plusMonths() method of the LocalDate class for Java 8 and Higher Versions.
// Add one month to the current local date
LocalDate localDate = LocalDate.now().plusMonths(1);
// Add one month to any local date object
LocalDate localDate = LocalDate.parse("2022-02-14").plusMonths(1); // 2022-03-14
Reference: https://www.javaexercise.com/java/java-add-months-to-date
Constants are in Portuguese because yes , but javadoc is understandable enough.
Just call
Calendar cal = Calendar.getInstance();
cal.setTime(yourDate);
DateSumUtil.sumOneMonth(cal);
and that's that. Related code:
package you.project.your_package_utils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.List;
public class DateSumUtil {
private static Integer[] meses31 = { 2, 4, 7, 9 };
private static List<Integer> meses31List = Arrays.asList(meses31);
private static SimpleDateFormat s = new SimpleDateFormat("dd/MM/yyyy");
private static final int MES = Calendar.MONTH;
private static final int ANO = Calendar.YEAR;
private static final int DIA = Calendar.DAY_OF_MONTH;
/**
* Receives a date and adds one month. <br />
*
* @param c date to receive an added month, as {@code java.util.Calendar}
* @param dia day of month of the original month
*/
public static void addOneMonth(Calendar c, int dia) throws ParseException {
if (cal.get(MES) == 0) { if (dia < 29) cal.add(MES, 1);
else { if (cal.get(ANO) % 4 == 0) { if (dia < 30) cal.add(MES, 1);
else cal.setTime(s.parse("29/02/" + cal.get(ANO)));
} else { if (dia < 29) cal.add(MES, 1);
else cal.setTime(s.parse("28/02/" + cal.get(ANO)));
} } } else if (meses31List.contains(cal.get(MES))) {
if (dia < 31) { cal.add(Calendar.MONTH, 1);
cal.set(DIA, dia);
} else cal.setTime(s.parse("30/" + (cal.get(MES) + 2) + "/" + cal.get(ANO)));
} else { cal.add(MES, 1);
cal.set(DIA, dia); }
}
public Date addMonth(Date inputDate, int monthToAddNumber){
Calendar calendar = Calendar.getInstance();
calendar.setTime(inputDate);
// Add 'monthToAddNumber' months to inputDate
calendar.add(Calendar.MONTH, monthToAddNumber);
return calendar.getTime();
}
then call method:
addMonth(new Date(), 1)
public class StringSplit {
public static void main(String[] args) {
// TODO Auto-generated method stub
date(5, 3);
date(5, 4);
}
public static String date(int month, int week) {
LocalDate futureDate = LocalDate.now().plusMonths(month).plusWeeks(week);
String Fudate = futureDate.toString();
String[] arr = Fudate.split("-", 3);
String a1 = arr[0];
String a2 = arr[1];
String a3 = arr[2];
String date = a3 + "/" + a2 + "/" + a1;
System.out.println(date);
return date;
}
}
Output:
10/03/2020
17/03/2020
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