Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Dates etc

Posted on 1998-07-29
4
186 Views
Last Modified: 2010-03-30
Im looking for a way to take a String convert it to a GregorianCalendar object and add
a number of days to it and return a string
Something like:

String date="01/01/1998";
int month=Integer.parseInt(substring(0,2));
int month=Integer.parseInt(substring(3,5));
int year= Integer.parseInt(substring(6));

Calendar cal= new GregorianCalendar(year,month,day);
cal.roll(Calendar.DATE,true);
for (int i=0;i<10;i++)  {
     cal.add(GregorianCalendar.DATE,7);  //to get a week in the future
     System.out.println("DATE: " + cal.getTime());
     //convert new date to string in MM/DD/YYYY format??????
}

This gives an incorrect date i think because it uses 0 for January, 1 for Feb, etc in the GregorianCalendar constructor
So the output is something like:
DATE: Mon Feb 02 00:00:00 CST 1998
DATE: Mon Feb 09 00:00:00 CST 1998
DATE: Mon Feb 16 00:00:00 CST 1998
DATE: Mon Feb 23 00:00:00 CST 1998
DATE: Mon Mar 02 00:00:00 CST 1998
DATE: Mon Mar 09 00:00:00 CST 1998
DATE: Mon Mar 16 00:00:00 CST 1998
DATE: Mon Mar 23 00:00:00 CST 1998
DATE: Mon Mar 30 00:00:00 CST 1998
DATE: Mon Apr 06 00:00:00 CDT 1998
DATE: Mon Apr 13 00:00:00 CDT 1998
 
Which is not what was intended if i use:
Calendar cal= new GregorianCalendar(year,month,day-1);
it works like i intended but i still have the problem of converting what is returned by getTime() to a format
that I prefer (or better yet that I can alter whether it be MM/DD/YYYY or DD/MM/YYYY or maybe even a two digit year) without having the time show up

I guess what im asking is what is the best way to do this (or even a good way)
The whole Date/Calendar class thing is a bit confusing
anyone out there figure it out and want to share some knowledge?

PS i may left out exception catching
 
0
Comment
Question by:mbunkows
  • 2
  • 2
4 Comments
 
LVL 5

Accepted Solution

by:
msmolyak earned 50 total points
ID: 1229106
Try this:

DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
String formattedDate = dateFormat.format(cal.getTime());
0
 

Author Comment

by:mbunkows
ID: 1229107
ahhh java.text package didnt even look in there :(

but what about the converting from string to Calender
do i just use the constructer like:
GregorianCalendar gc=GregorianCalendar(year,month,day-1);  ???
seems a bit illogical
is there a better way?
i guess im just not sure why it works that way

Thanks
0
 
LVL 5

Expert Comment

by:msmolyak
ID: 1229108
Check the DateFormat.parse(String date) method which returns the Date object. (It works in reverse top the format() method).
0
 

Author Comment

by:mbunkows
ID: 1229109
works great!
just need to leave the constructers out of it

Thanks alot!

0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
hibernate example using maven 12 56
null output 3 35
ejb entity bean example issue 2 16
Is Applet the way to go for my drag and drop system? 8 25
Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers learn how to read error messages and identify possible mistakes that could cause hours of frustration. Coding is as much about debugging your code as it is about writing it. Define Error Message: Line Numbers: Type of Error: Break Down…
This video teaches viewers about errors in exception handling.

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question