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Posted on 1998-02-06
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I am trying to create a calendar applet and I am having difficulty with setting the days of the calendar.  I want the user to be able to select month and year, but when they do, how do u tell how many days the month has, and what day the first day of the month falls on?  How can I do these calculations?
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Question by:bjg
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imladris earned 200 total points
ID: 1232920
It is easiest to hardcode the number of days in months (though you do need to make allowance for leap years).

Which day the first day of the month falls on could be done as follows:

assume the month and year selection are in variables of the same name:

Date ms=new Date(year-1900,month-1,1);
int sd=ms.getDay();

Date is a slightly strange class in the util package. It takes years (assuming 1900 as 0) and month (from 0-11). getDay returns the day of the week (0-6 with Sunday being 0).

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by:bjg
ID: 1232921
How do I determine leap years?
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by:bjg
ID: 1232922
How do I tell what day the first of each month falls on?

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by:imladris
ID: 1232923
A leapyear occurs when year%4==0 (i.e. if the remainder after dividing the year by 4 is 0).

The day the first of any particular month falls on is obtained by creating an instance of the date object as specified above. For March 1998, for example, you would have year set to 1998 and month to 3. Now create a date object for the first of March 1998:

Date ms=new Date(year-1900,month-1,1);

Adjustments are needed due to the way the date object is defined as explained before.
Now you have an object that represents the 1st of March 1998 and you can get various kinds of information from it, like the UTC (Universal Time Code), a String representing that date etc. etc. For our purposes you wish to know what day of the week this date falls on. The method "public int getDay();" will return a value from 0 to 6 (with Sunday being 0) indicating what day of the week it is on this date (March 1st, 1998).


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