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Calendar question

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Join Date: Mar 2006

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degamer106 degamer106 is offline

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Calendar question

May 8th, 2008

Suppose I have a week that begins with Sunday and ends with Saturday (so UMTWThFS). How do I get the date for each day of the week if, lets say, we use this month and year? I looked in the API but I wasn't sure what to extract to make it work.

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masijade

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Re: Calendar question

May 8th, 2008

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
Calendar a = new Calendar();
a.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
Date b = Calendar.getTime();
Calendar a = new Calendar();
a.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
Date b = Calendar.getTime();

As an example. There's a bit more to it, depending on exactly what you want to do, but that's a start (and more than a start).

Java Programmer and Sun Systems Administrator

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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
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Join Date: Mar 2006

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degamer106 degamer106 is offline

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Re: Calendar question

May 8th, 2008

Thanks, it worked perfectly.

I have another question though: Given some date, how do I find out what the date for the first day of the week is? For instance,

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
GregorianCalendar cal = new GregorianCalendar(thisYear, thisMonth, todaysDate);
cal.set(GregorianCalendar.DAY_OF_WEEK, i);
int tempDate = cal.get(GregorianCalendar.DAY_OF_MONTH);
GregorianCalendar cal = new GregorianCalendar(thisYear, thisMonth, todaysDate);
cal.set(GregorianCalendar.DAY_OF_WEEK, i);
int tempDate = cal.get(GregorianCalendar.DAY_OF_MONTH);

When I do this, the first day of the week is set to whatever todaysDate is, which isn't what I want.

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masijade

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Re: Calendar question

May 8th, 2008

Look at the add method of Calendar (hint, you can give it negative numbers). Cycle backwards and use get(Calendar.DAY_OF_WEEK) and compare it to the GregorianCalendar method getFirstDayOfWeek().

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degamer106 degamer106 is offline

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Re: Calendar question

May 8th, 2008

All right I managed to get it. Thanks a bunch.

I'm still a little unclear about some of the fields in Calendar/GregorianCalendar though. I had to find out the hard day that decrementing DAY_OF_MONTH will also affect DAY_OF_WEEK. Am I reading the API wrong? b/c I was under the impression that they were distict fields with DAY_OF_MONTH giving you the date and DAY_OF_WEEK giving you UMTWThFS.