Calculates the difference of two dates

Package com.xcfh.util;

Import java.text.ParseException;
Import Java.text.SimpleDateFormat;
Import Java.util.Calendar;
Import Java.util.Date;
Import Java.util.GregorianCalendar;

/**
*
* @ClassName: Datemargin
*
* @Description: Calculates the difference of days between two dates
* @author Pinetree
* @date December 20, 2014 2:20:17
* @version
*/
public class Datemargin {

public static void Main (string[] args) {
try{
/**
* GregorianCalendar (int year, int month, int dayofmonth, int hourofday, int minute, int second)
* year-used to set the value of the year Calendar field in the calendar.
* Month-Used to set the value of the month calendar field in the calendar. The Month value is based on 0, for example, 0 for January.
* DayOfMonth-Used to set the value of the Day_of_month Calendar field in the calendar.
* Hourofday-Used to set the value of the Hour_of_day Calendar field in the calendar.
* minute-used to set the value of the minute Calendar field in the calendar.
* Second-used to set the value of the second Calendar field in the calendar.
*/
Date startdate = new GregorianCalendar (n, 0). GetTime ();
Date endDate = new GregorianCalendar (). GetTime ();
System.out.println (startdate + "\ T" + endDate);
System.out.println ("Number of days using Getintervaldays =" + getintervaldays (StartDate, endDate));
System.out.println ("Number of days using Daysoftwo =" + Daysoftwo (StartDate, endDate));
System.out.println ("Number of days using Daysbetween =" + Daysbetween (StartDate, endDate));
System.out.println ("Number of days using Daysmargin =" + Daysmargin (startdate.tolocalestring (), enddate.tolocalestring ()));
}catch (Exception e) {
E.printstacktrace ();
}
}

/**
* Calculates the number of days between two dates
*
* This version of the method to compare to the strict sense of the day, for example, the calculation today compared to yesterday, a few days,
* We may all think of it as 1, but we're going to enter two date-type parameters, and this date contains not only days,
* There are hours, minutes, etc., version 1 will be different depending on the hours you enter, return different results,
* For example, you enter the parameters today at noon and last night two time, it will tell you the difference of 0 days.
*
* @param startdate Start date
* @param endDate End Date
* @return int If yes-1 description start date or end date is null
*/
public static int Getintervaldays (date startdate, date endDate) {
if (null = = StartDate | | null = = endDate) {
return-1;
}
System.out.println ("endDate =" + enddate.gettime () + "\tstartdate =" + Startdate.gettime ());
Long Intervalmilli = Enddate.gettime ()-startdate.gettime ();
System.out.println ("Intervalmilli =" + Intervalmilli);
return (int) (Intervalmilli/(24 * 60 * 60 * 1000));
}

/**
* Calculates the number of days between two dates
*
* @param startdate Start date
* @param endDate End Date
* @return int If yes-1 description start date or end date is null
*/
public static int Daysoftwo (date startdate, date endDate) {
if (null = = StartDate | | null = = endDate) {
return-1;
}
Calendar calendar = Calendar.getinstance ();
Calendar.settime (StartDate);
int startday = Calendar.get (calendar.day_of_year);
System.out.println ("StartDay =" + StartDay);
Calendar.settime (endDate);
int endday = Calendar.get (calendar.day_of_year);
System.out.println ("Endday =" + Endday);
return endday-startday;
}

/**
* Calculate two date difference days, first turn the date into YYYY-MM-DD format, and then calculate.
*
* @param startdate Start date
* @param endDate End Date
* @return int If yes-1 description start date or end date is null
* @throws ParseException
*/
public static int Daysbetween (date startdate, date endDate) throws parseexception{
System.out.println (startdate.tolocalestring () + "\ T" + enddate.tolocalestring ());
if (null = = StartDate | | null = = endDate) {
return-1;
}
SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd");
StartDate = Sdf.parse (Sdf.format (startdate));
EndDate = Sdf.parse (Sdf.format (endDate));
Calendar calendar = Calendar.getinstance ();
Calendar.settime (StartDate);
Long StartDay = Calendar.gettimeinmillis ();
Calendar.settime (endDate);
Long endday = Calendar.gettimeinmillis ();

return (int) ((endday-startday)/(24 * 60 * 60 *1000));
}

/**
* String type Date calculation difference days
*
* @param startdate Start date
* @param endDate End Date
* @return int If yes-1 description start date or end date is null
* @throws ParseException
*/
public static int Daysmargin (string startdate, String endDate) throws parseexception{
if (null = = StartDate | | null = = endDate) {
return-1;
}
SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd");
Date newstartdate = Sdf.parse (startdate);
Date newenddate = Sdf.parse (endDate);
Calendar calendar = Calendar.getinstance ();
Calendar.settime (newstartdate);
Long StartDay = Calendar.gettimeinmillis ();
Calendar.settime (newenddate);
Long endday = Calendar.gettimeinmillis ();
return (int) ((endday-startday)/(24 * 60 * 60 *1000));
}
}

Calculates the difference of two dates