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How to manipulate date / time using Calendar and then put the modified data inside the Date class?

James Dekker
Ranch Hand

Joined: Dec 09, 2006
Posts: 215
Hi there,

I am trying to do the following:

(1) Get today's date.

(2) Subtract one month from it.

(3) Check and see if the actual day is less than a specific number (e.g. 15).

(4) Set it back as a Date object with the new day and previous month.

For example, if today's date is:

April 1, 2010

I want my method to return a Date object which contains this:

March 15, 2010

Here's what I have so far:



Output:


As you can see that I am printing out to stdout to check my values... I need it to return a date object (the SimpleDateFormat was only to see my printlns).
Any help will be greatly appreciated...
Ireneusz Kordal
Ranch Hand

Joined: Jun 21, 2008
Posts: 423
Change line 16 to:
cal.set(Calendar.MONTH, lastMonthInt - 1);

Months in Calendar starts with 0 for January - if you set month to 3, Calendar teats this value as April.

You also can use:
cal.roll(Calendar.MONTH, - 1);
James Dekker
Ranch Hand

Joined: Dec 09, 2006
Posts: 215
Ireneusz,

Thank you so much for the response... I think you didn't understand my question. I know how to manipulate date and time using the Calendar class but how do I set the changed date and / or time into a Date object?

Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14144
    
  18

Call the getTime() method on the Calendar object - that will return a Date object set to the time and date of the Calendar.


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James Dekker
Ranch Hand

Joined: Dec 09, 2006
Posts: 215
Jesper,

I know this, on line 5, I am getting the time like this:



I am not seeking to get the current time, use the Calendar class to manipulate the current time's data, and set it as a String (the SimpleDateFormat is already in there so I can print to console what the values are).

What I am seeking is to get the current time, use the Calendar class to change the current date's values (specifically month and day) and store in back into a Date object.

With thanks and kindess...
Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14144
    
  18

James Dekker wrote:What I am seeking is to get the current time, use the Calendar class to change the current date's values (specifically month and day) and store in back into a Date object.

But you can do that exactly with the getTime() method of class Calendar:

Isn't that what you mean?
 
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