Finding day of week

[qball]

This could be for any language. Should be pretty easy.

don't you hate when you work on something, and you get brainfreeze and all of sudden you're dumber than a box of rocks...

anyway, here's the deal. you are given:

0 = sunday ... 6 = saturday
//I personally prefer 1-7, but...
startday of given month. ie. for jan 2003, the first is on a wednesday, or as defined 3.
a day of the month. for jan 2003, 1-31.

return the day of the week for the day of the month.

so if we have integer calcdow(int startday, int dayofmonth), the above example would be

calcdow(3, 1) returns 3.

or

calcdow(3, 15) returns 3. as today is wednesday.

a very poor way would be:

public integer calcdow(int startday, int dayofmonth)
{
	for (int i= 1; i < dayofmonth; i++) 
	{
		startday++;
		if (startday == 7)
		{
			startday =0;
		}
	}
	
	return startday;
}

DOH!, brainfreeze just left, nevermind, as:

dayofweek = dayofmonth%7 + startday - 1;

sometimes you just have to step away from the issue....

[chris64]

Got an idea get a calendar. ROFL.

[krohnjw]

Hm, or help him with his coding....i believe either would be a constructive post....or would only one......
The last should work to find the day of the week.

[qball]

it's OK.

Quote:

Got an idea get a calendar. ROFL.

useless posting seems common, as this thread shows.

ROFL,

[flart]
what calendar do you use?
[/flart]

[qball]

very curious.

dayofweek = dayofmonth%7 + startday - 1;

nobody even tried code to see if it works? as it doesn't.

lol.

[ctaylor]

I don't know if this is of value to you, but there is a DATEDIFF function detailed within the MSDN website.

I have used this function to exclude weekends when determining the number of days early/late a delivery was received.

EDIT: http://msdn.microsoft.com/library/de...ctdatediff.asp

[qball]

thanks.

I was working with some other code (let's say inherited, lol, not OO inherited), and my opinion of that code, is, eh..ah..no comment.

the solution was simple:

date datatypes generally have info one needs given various date/time functions (DB, scripting, lang...). as in:

value of "1/28/03" (whatever format), already knows it is:

Monday, the 82th of 1203bc????

sorry, but "0" == sunday?, even if done for easy loop indexing, not good idea.