Calendar工具类使用2

冷不防 2022-06-01 04:57 188阅读 0赞

package com.xhx.calendar;
    
    import java.util.Calendar;
    import java.util.Date;
    
    /** * @author xuhaixing * @date 2018/1/20 12:09 */ public class App2 {
        /** * 取得当天的起始时间 */ private static Calendar getDayStartTime() {
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(new Date().getTime());
            calendar.set(Calendar.HOUR_OF_DAY,0);
            calendar.set(Calendar.MINUTE,0);
            calendar.set(Calendar.SECOND,0);
            calendar.set(Calendar.MILLISECOND,0);
    
            System.out.println("当天开始时间："+calendar.getTime());
            return calendar;
        }
    
        /** * 获取当天结束时间 * @return */ public static Calendar getDayEndTime(){
            Calendar calendar = getDayStartTime();
    
            calendar.add(Calendar.DATE,1);
            calendar.add(Calendar.MILLISECOND,-1);
            System.out.println("当天结束时间: "+calendar.getTime());
            return calendar;
        }
    
        public static Calendar getFirstDayOfMonth(){
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(new Date());
    
            calendar.set(Calendar.DAY_OF_MONTH,1);
            calendar.set(Calendar.HOUR_OF_DAY,0);
            calendar.set(Calendar.MINUTE,0);
            calendar.set(Calendar.SECOND,0);
            calendar.set(Calendar.MILLISECOND,0);
    
            System.out.println("当前月第一天: "+calendar.getTime());
            return calendar;
        }
    
        /** * 获得所在月份最后一天 * @return */ public static Calendar getEndDayOfMonth(){
            //第一种实现方式 月份+1，日期置1，日期-1 （只关注日期，不关注时间） Calendar calendar1 = Calendar.getInstance();
            calendar1.add(Calendar.MONTH,1);
            calendar1.set(Calendar.DAY_OF_MONTH,1);
            calendar1.add(Calendar.DAY_OF_MONTH,-1);
            System.out.println("所在月份最后一天: "+calendar1.getTime());
    
            //第二种实现方式 月份+1，日期置1，时间置0，毫秒减一 Calendar calendar2 = Calendar.getInstance();
            calendar2.setTime(new Date());
            calendar2.add(Calendar.MONTH,1);
            calendar2.set(Calendar.DAY_OF_MONTH,1);
            calendar2.set(Calendar.HOUR_OF_DAY,0);
            calendar2.set(Calendar.MINUTE,0);
            calendar2.set(Calendar.SECOND,0);
            calendar2.set(Calendar.MILLISECOND,0);
            calendar2.add(Calendar.MILLISECOND,-1);
            System.out.println("所在月份最后一天："+calendar2.getTime());
    
            
            return calendar1;
        }
    
        /** * 上个月最后一天 * @return */ public static Calendar getPreMonthOfMonth(){
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(new Date());
            calendar.set(Calendar.DAY_OF_MONTH,0);  //日期设置为0，为上个月最后一天 System.out.println("上个月最后一天："+calendar.getTime());
            return calendar;
        }
    
        /** * 设置时间 * @return */ public static Calendar setDateTime(){
            Calendar calendar = Calendar.getInstance();
            calendar.set(2017,10,16,9,8,7);
            System.out.println("当前时间："+calendar.getTime());
            return calendar;
        }
        public static void main(String[] args) {
            setDateTime();
            getDayStartTime();
            getDayEndTime();
            getFirstDayOfMonth();
            getEndDayOfMonth();
            getPreMonthOfMonth();
        }
    
    
    
    }

![20180120165305840][]

满意请支持一下：

![SouthEast][]![SouthEast 1][]

[20180120165305840]: /images/20220601/3cbe82e2353b43ad933916593265630b.png
[SouthEast]: https://img-blog.csdn.net/20180120165714481?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMjMyNjQ2Mg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast
[SouthEast 1]: /images/20220601/edb09794ad49494ca447cf0d6d7744fa.png