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  • Java – How to add days to current date

    1. Calendar.add

    Example to add 1 year, 1 month, 1 day, 1 hour, 1 minute and 1 second to the current date.

    DateExample.java
    package com.mkyong.time;
    
    import java.text.DateFormat;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    public class DateExample {
    
        private static final DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    
        public static void main(String[] args) {
    
            Date currentDate = new Date();
            System.out.println(dateFormat.format(currentDate));
    
            // convert date to calendar
            Calendar c = Calendar.getInstance();
            c.setTime(currentDate);
    
            // manipulate date
            c.add(Calendar.YEAR, 1);
            c.add(Calendar.MONTH, 1);
            c.add(Calendar.DATE, 1); //same with c.add(Calendar.DAY_OF_MONTH, 1);
            c.add(Calendar.HOUR, 1);
            c.add(Calendar.MINUTE, 1);
            c.add(Calendar.SECOND, 1);
    
            // convert calendar to date
            Date currentDatePlusOne = c.getTime();
    
            System.out.println(dateFormat.format(currentDatePlusOne));
    
        }
    
    }
    

    Output

    2016/11/10 17:11:48
    2017/12/11 18:12:49


    2. Java 8 Plus Minus

    In Java 8, you can use the plus and minus methods to manipulate LocalDate, LocalDateTime and ZoneDateTime, see the following examples

    LocalDateTimeExample.java
    package com.mkyong.time;
    
    import java.text.DateFormat;
    import java.text.SimpleDateFormat;
    import java.time.LocalDateTime;
    import java.time.ZoneId;
    import java.time.format.DateTimeFormatter;
    import java.util.Date;
    
    public class LocalDateTimeExample {
    
        private static final String DATE_FORMAT = "yyyy/MM/dd HH:mm:ss";
        private static final DateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
        private static final DateTimeFormatter dateFormat8 = DateTimeFormatter.ofPattern(DATE_FORMAT);
    
        public static void main(String[] args) {
    
    		// Get current date
            Date currentDate = new Date();
            System.out.println("date : " + dateFormat.format(currentDate));
    
            // convert date to localdatetime
            LocalDateTime localDateTime = currentDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime();
            System.out.println("localDateTime : " + dateFormat8.format(localDateTime));
    
            // plus one
            localDateTime = localDateTime.plusYears(1).plusMonths(1).plusDays(1);
            localDateTime = localDateTime.plusHours(1).plusMinutes(2).minusMinutes(1).plusSeconds(1);
    
            // convert LocalDateTime to date
            Date currentDatePlusOneDay = Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
    
            System.out.println("
    Output : " + dateFormat.format(currentDatePlusOneDay));
    
        }
    
    }
    

    Output

    date : 2016/11/10 17:40:11
    localDateTime : 2016/11/10 17:40:11
    
    Output : 2017/12/11 18:41:12


    http://www.mkyong.com/java/java-how-to-add-days-to-current-date/
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  • 原文地址:https://www.cnblogs.com/shy1766IT/p/10162123.html
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