计算2个日期之间相差的

心已赠人 2022-09-03 00:23 220阅读 0赞

package com.linlong.crm.util;
    
    
    import com.linlong.util.DateUtil;
    
    import java.text.*;
    import java.util.Calendar;
    import java.util.Date;
    
    /** */
    public class DateCompareUtil { 
        /** * 计算2个日期之间相差的 相差多少年月日 * 比如：2011-02-02 到 2017-03-02 相差 6年，1个月，0天 * @param fromDate * @param toDate * @return */
        public static DayCompare dayComparePrecise(Date fromDate,Date toDate){ 
            Calendar  from  =  Calendar.getInstance();
            from.setTime(fromDate);
            Calendar  to  =  Calendar.getInstance();
            to.setTime(toDate);
    
            int fromYear = from.get(Calendar.YEAR);
            int fromMonth = from.get(Calendar.MONTH);
            int fromDay = from.get(Calendar.DAY_OF_MONTH);
    
            int toYear = to.get(Calendar.YEAR);
            int toMonth = to.get(Calendar.MONTH);
            int toDay = to.get(Calendar.DAY_OF_MONTH);
            int year = toYear  -  fromYear;
            int month = toMonth  - fromMonth;
            int day = toDay  - fromDay;
            return DayCompare.builder().day(day).month(month).year(year).build();
        }
    
    
        /** * 计算2个日期之间相差的 以年、月、日为单位，各自计算结果是多少 * 比如：2011-02-02 到 2017-03-02 * 以年为单位相差为：6年 * 以月为单位相差为：73个月 * 以日为单位相差为：2220天 * @param fromDate * @param toDate * @return */
        public static DayCompare dayCompare(Date fromDate,Date toDate){ 
            Calendar  from  =  Calendar.getInstance();
            from.setTime(fromDate);
            Calendar  to  =  Calendar.getInstance();
            to.setTime(toDate);
            //只要年月
            int fromYear = from.get(Calendar.YEAR);
            int fromMonth = from.get(Calendar.MONTH);
    
            int toYear = to.get(Calendar.YEAR);
            int toMonth = to.get(Calendar.MONTH);
    
            int year = toYear  -  fromYear;
            int month = toYear *  12  + toMonth  -  (fromYear  *  12  +  fromMonth);
            int day = (int) ((to.getTimeInMillis()  -  from.getTimeInMillis())  /  (24  *  3600  *  1000));
            return DayCompare.builder().day(day).month(month).year(year).build();
        }
    
        /** * 计算2个日期相差多少年 * 列：2011-02-02 ~ 2017-03-02 大约相差 6.1 年 * @param fromDate * @param toDate * @return */
        public static String yearCompare(Date fromDate,Date toDate){ 
            DayCompare result = dayComparePrecise(fromDate, toDate);
            double month = result.getMonth();
            double year = result.getYear();
            //返回2位小数，并且四舍五入
            DecimalFormat df = new DecimalFormat("######0.0");
            return df.format(year + month / 12);
        }
    
        /** * 将字符串格式的时间转为毫秒值 * * @param dateTime * 字符串时间（格式：2015 -12- 31 23:59:53） * @return */
        public static long getLongFromString(String dateTime) { 
            try { 
                StringBuffer buffer = new StringBuffer();
                char[] charArray = dateTime .toCharArray();
                for (int i = 0; i < charArray .length ; i ++) { 
                    if (Character.isDigit( charArray[i ])) { 
                        buffer.append( charArray[i ]);
                    }
                }
                dateTime = buffer.toString();
                buffer = null;
                Calendar c = Calendar. getInstance();
                c.setTime( new SimpleDateFormat("yyyyMMddHHmmss" ).parse(dateTime ));
                return c .getTimeInMillis();
            } catch (Exception e ) { 
                e.printStackTrace();
            }
            return 0L ;
        }
    
        public static void main(String[] args) { 
    // DayCompare dayCompare = dayCompare(new Date(1610700841000L), new Date());
    // System.out.println(dayCompare.getMonth());
            System.out.println(getLongFromString("2021-08-03 16:03:58"));
        }
    }

package com.linlong.crm.util;
    
    import lombok.Builder;
    import lombok.Data;
    
    @Data
    @Builder
    public class DayCompare{ 
        private int year;
        private int month;
        private int day;
    }