Get Difference Between Two Dates

引用

import java.sql.Timestamp;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class BaseModel {
    /**
     * @Des for view mode to show friendly record date.
     * @param modTs(record data time)
     * @return Today, Yesterday, More than 1 week ...
     */
    public String getFriendStr(Timestamp modTs) {
        Date todayDate = new Date();
        Date recordDate = new Date();
        java.text.SimpleDateFormat df = new java.text.SimpleDateFormat();
        df.applyPattern("yyyy-MM-dd");
        try {
            recordDate = df.parse(modTs.toString());
            todayDate = df.parse(todayDate.toString());
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        String friendlyStr = "";
        int countDays = this.daysBetween(recordDate,todayDate);
        int countMonths = this.getDateDif(recordDate,todayDate)[1];
        
        if(countDays>100 || countMonths>2){
            friendlyStr = "More than 3 months";
        }else if(countMonths == 1 || countMonths == 2){
            friendlyStr = "More than 1 month";
        }else if(countDays >= 14){
            friendlyStr = "More than 2 weeks";
        }else if(countDays >= 7){
            friendlyStr = "More than 1 week";
        }else if(countDays >= 4 && countDays = 3){
            friendlyStr = "3 days before";
        }else if(countDays >= 1){
            friendlyStr = "Yesterday";
        }else {
            friendlyStr = "Today";
            /*df.applyPattern("HH:mm:ss");
            friendlyStr = df.format(modTs);*/
        }
        return friendlyStr;
    }
    /**
     * @Des: Get Difference Between Two Dates in Days, Months and Year format.
     * @param date1
     * @param date2
     * @return
     */
    public int[] getDateDif(Date date1, Date date2) {
        int[] monthDay = { 31, -1, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
        Calendar fromDate;
        Calendar toDate;
        int increment = 0;
        int[] ageDiffArr = new int[3];
        int year;
        int month;
        int day;
        Calendar d1 = new GregorianCalendar().getInstance();
        d1.setTime(date1);
        Calendar d2 = new GregorianCalendar().getInstance();
        d2.setTime(date2);
        if (d1.getTime().getTime() > d2.getTime().getTime()) {
            fromDate = d2;
            toDate = d1;
        } else {
            fromDate = d1;
            toDate = d2;
        }
        if (fromDate.get(Calendar.DAY_OF_MONTH) > toDate.get(Calendar.DAY_OF_MONTH)) {
            increment = monthDay[fromDate.get(Calendar.MONTH)];
        }
        GregorianCalendar cal = new GregorianCalendar();
        boolean isLeapYear = cal.isLeapYear(fromDate.get(Calendar.YEAR));
        if (increment == -1) {
            if (isLeapYear) {
                increment = 29;
            } else {
                increment = 28;
            }
        }
        // DAY CALCULATION
        if (increment != 0) {
            day = (toDate.get(Calendar.DAY_OF_MONTH) + increment) - fromDate.get(Calendar.DAY_OF_MONTH);
            increment = 1;
        } else {
            day = toDate.get(Calendar.DAY_OF_MONTH) - fromDate.get(Calendar.DAY_OF_MONTH);
        }
        // MONTH CALCULATION
        if ((fromDate.get(Calendar.MONTH) + increment) > toDate.get(Calendar.MONTH)) {
            month = (toDate.get(Calendar.MONTH) + 12) - (fromDate.get(Calendar.MONTH) + increment);
            increment = 1;
        } else {
            month = (toDate.get(Calendar.MONTH)) - (fromDate.get(Calendar.MONTH) + increment);
            increment = 0;
        }
        // YEAR CALCULATION
        year = toDate.get(Calendar.YEAR) - (fromDate.get(Calendar.YEAR) + increment);
        ageDiffArr[0] = day;
        ageDiffArr[1] = month;
        ageDiffArr[2] = year;
        return ageDiffArr; // RESULT AS DAY, MONTH AND YEAR in form of Array
    }
    /**
     * @Des  Get Difference Between Two Dates in Days (Total days)
     * @param early
     * @param late
     * @return
     */
    public int daysBetween(Date early, Date late) {
        java.util.Calendar calst = java.util.Calendar.getInstance();
        java.util.Calendar caled = java.util.Calendar.getInstance();
        calst.setTime(early);
        caled.setTime(late);
        // init set time to zero.
        calst.set(java.util.Calendar.HOUR_OF_DAY, 0);
        calst.set(java.util.Calendar.MINUTE, 0);
        calst.set(java.util.Calendar.SECOND, 0);
        caled.set(java.util.Calendar.HOUR_OF_DAY, 0);
        caled.set(java.util.Calendar.MINUTE, 0);
        caled.set(java.util.Calendar.SECOND, 0);
        // get between tow one.
        int days = ((int) (caled.getTime().getTime() / 1000) - (int) (calst.getTime().getTime() / 1000)) / 3600 / 24;
        return days;
    }
}