Techno News, How To Unbrick Qualcomm Android Devices, 15 Second ADB Installer Latest Version V1.4.3 Free, Samsung FRP Reset Files Using Odin Flash, ATF Box Full Crack Tool, Facebook Contacts Sync, Miracle Box Latest Setup Full Crack Free, 4 Steps Jcow Social Networking Web Server, Infinity Box Chinese Miracle 2 MTK v 1.58 setup, Miracle Box Crack Latest Version 2.26 Full Setup, Nokia Asha 501 RM-899 Latest Flash File

Kamis, 12 Juli 2007

Java - calculate the difference between two dates

Java - calculate the difference between two dates - is the information you are looking for in search engines like google and others, okay we have provided such information in the blog Techno News, we have around collecting information from various reliable sources and presenting it in this blog, well please read Java - calculate the difference between two dates to finish:

Articles : Java - calculate the difference between two dates
full Link : Java - calculate the difference between two dates

You can also see our article on:


Java - calculate the difference between two dates

Finding the difference between two dates isn't as straightforward as subtracting the two dates and dividing the result by (24 * 60 * 60 * 1000). Infact, its erroneous! 

Going the 'milliseconds way' will lead to rounding off errors and they become most evident once you have a little thing like "Daylight Savings Time" come into the picture.

The Correct Way:

/** Using Calendar - THE CORRECT WAY**/
//assert: startDate must be before endDate
public static long daysBetween(Calendar startDate, Calendar endDate) {
Calendar date = (Calendar) startDate.clone();
long daysBetween = 0;
while (date.before(endDate)) {
date.add(Calendar.DAY_OF_MONTH, 1);
daysBetween++;
}
return daysBetween;
}
}

or more efficiently, (thanks Mauro), if you're using the Gregorian Calendar:
/** Using Calendar - THE CORRECT (& Faster) WAY**/
/****Needs testing ...... Anyone?****/
//assert: startDate must be before endDate
public static long daysBetween(final Calendar startDate, final Calendar endDate) {
int MILLIS_IN_DAY = 1000 * 60 * 60 * 24;
long endInstant = endDate.getTimeInMillis();
int presumedDays = (int) ((endInstant - startDate.getTimeInMillis()) / MILLIS_IN_DAY);
Calendar cursor = (Calendar) startDate.clone();
cursor.add(Calendar.DAY_OF_YEAR, presumedDays);
long instant = cursor.getTimeInMillis();
if (instant == endInstant)
return presumedDays;
final int step = instant < endInstant ? 1 : -1;
do {
cursor.add(Calendar.DAY_OF_MONTH, step);
presumedDays += step;
} while (cursor.getTimeInMillis() != endInstant);
return presumedDays;
}



The Nuances:

Lets take, for example, the difference between the two dates
03/24/2007 and 03/25/2007 should be 1 day; 

However, using the millisecond route, you'll get 0 days, if you run this in the UK!


import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class DateTest {

public class DateTest {

static SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy");

public static void main(String[] args) {

TimeZone.setDefault(TimeZone.getTimeZone("Europe/London"));

//diff between these 2 dates should be 1
Date d1 = new Date("01/01/2007 12:00:00");
Date d2 = new Date("01/02/2007 12:00:00");

//diff between these 2 dates should be 1
Date d3 = new Date("03/24/2007 12:00:00");
Date d4 = new Date("03/25/2007 12:00:00");

Calendar cal1 = Calendar.getInstance();cal1.setTime(d1);
Calendar cal2 = Calendar.getInstance();cal2.setTime(d2);
Calendar cal3 = Calendar.getInstance();cal3.setTime(d3);
Calendar cal4 = Calendar.getInstance();cal4.setTime(d4);

printOutput("Manual ", d1, d2, calculateDays(d1, d2));
printOutput("Calendar ", d1, d2, daysBetween(cal1, cal2));
System.out.println("---");
printOutput("Manual ", d3, d4, calculateDays(d3, d4));
printOutput("Calendar ", d3, d4, daysBetween(cal3, cal4));
}


private static void printOutput(String type, Date d1, Date d2, long result) {
System.out.println(type+ "- Days between: " + sdf.format(d1)
+ " and " + sdf.format(d2) + " is: " + result);
}

/** Manual Method - YIELDS INCORRECT RESULTS - DO NOT USE**/
/* This method is used to find the no of days between the given dates */
public static long calculateDays(Date dateEarly, Date dateLater) {
return (dateLater.getTime() - dateEarly.getTime()) / (24 * 60 * 60 * 1000);
}

/** Using Calendar - THE CORRECT WAY**/
public static long daysBetween(Calendar startDate, Calendar endDate) {
Calendar date = (Calendar) startDate.clone();
long daysBetween = 0;
while (date.before(endDate)) {
date.add(Calendar.DAY_OF_MONTH, 1);
daysBetween++;
}
return daysBetween;
}
}

OUTPUT:
Manual - Days between: 01-Jan-2007 and 02-Jan-2007 is: 1
Calendar - Days between: 01-Jan-2007 and 02-Jan-2007 is: 1
---
Manual - Days between: 24-Mar-2007 and 25-Mar-2007 is: 0
Calendar - Days between: 24-Mar-2007 and 25-Mar-2007 is: 1



Information about the Java - calculate the difference between two dates has been discussed

A few of our information about the Java - calculate the difference between two dates, hopefully give more knowledge for you

You have finished reading Java - calculate the difference between two dates and many articles about Techno News in our blog this, please read it. and url link of this article is https://ikkemunandar.blogspot.com/2007/07/java-calculate-difference-between-two.html Hopefully discussion articles on provide more knowledge about the world of new tech gadgets and Techno News.

Tag :
Share on Facebook
Share on Twitter
Share on Google+
Tags :

Related : Java - calculate the difference between two dates

0 komentar:

Posting Komentar