Mark Volkmann wrote:
> On Dec 21, 2008, at 6:34 PM, Stephen Colebourne wrote:
>
>> Joda-Time doesn't have anything to help with this particular
>> calculation
>> (JSR-310 does).
>
> I'm new to Joda-Time. Perhaps some of my assumptions were wrong. I
> thought JSR-310 was all based on Joda-Time and assumed that anything
> new in JSR-310 would be tested by adding it to Joda-Time. When you say
> JSR-310 has it, do you mean that it's in the spec or that there is
> different library I could download now that has it?
JSR-310 is inspired by Joda-Time, rather than a straight adoption of it.
Thus, there are key differences in the APIs. JSR-310 isn't at the
download and use stage yet.
> Here's the implementation I came up with. If it looks useful, feel
> free to add it to Joda-Time under whatever name you think is best.
>
> /**
> * Gets the nth given weekday of a given month.
> * For example, to find the 4th Thursday of the month of November
> in 2008,
> * getNthWeekday(2008, 11, DateTimeConstants.THURSDAY, 4)
> * @param year the year
> * @param month the month
> * @param weekday the day of the week (such as Thursday)
> * @param n the number of that day within the month (such as the
> 4th)
> * @return the LocalDate
> */
> private static LocalDate getNthWeekday(
> int year, int month, int weekday, int n) {
>
> // Get the 1st day of the month.
> LocalDate ld = new LocalDate(year, month, 1);
>
> // Determine the number of days to advance to get to
> // the first requested weekday of the month.
> int firstWeekday = ld.getDayOfWeek();
> int diff = (7 - firstWeekday + weekday) % 7;
>
> return ld.plusDays(diff).plusWeeks(n - 1);
> }
I do remember having something like this on the Partial class at one
point, but taking it out. I might see if it can go back at some point.
Stephen
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