Peter,
I'm not sure `Date` class in EScript have Day DayOfWeek properties.
but based on your requiement I did this, a little augly but works:
function dayInMonth(date, weekday, n) {
var day = date.getDay();
if (day !== weekday) {
return false;
}
var preMonthLast = new Date(new Date().setTime(date.getTime() - n * 7 *
86400000));
var first = new Date(new Date().setTime(date.getTime() - (n - 1) * 7 *
86400000));
if (date.getMonth() - preMonthLast.getMonth() === 1 ||
(date.getMonth() === 0 && preMonthLast.getMonth() === 11)) {
if (date.getMonth() === first.getMonth()) {
return true;
}
}
return false;
}
console.log(dayInMonth(new Date('2016-12-01T00:00:01'), 4, 1));
console.log(dayInMonth(new Date('2016-12-02T00:00:01'), 5, 1));
console.log(dayInMonth(new Date('2016-12-08T00:00:01'), 4, 2));
console.log(dayInMonth(new Date('2017-01-03T00:00:01'), 2, 1));
console.log(dayInMonth(new Date('2017-01-03T00:00:01'), 2, 2));
On Sunday, November 6, 2016 at 1:31:22 PM UTC+8, Peter Scargill wrote:
>
> Can someone give me a hand...
>
> I need a simple function, given a day of the week - and a number, to do
> queries like "is this the 3rd Monday of the month" - returning true or
> false.
>
> I thought I had it here but it is returning false regardless. Can anyone
> spot what's wrong?
>
> function dayinmonth(weekday,n)
> {
> var date=new Date();
> if (n > 0)
> {
> var first = new Date(date.Year, date.Month, 1);
> return ((date.Day - first.Day)/ 7 == n - 1) && (date.DayOfWeek
> == weekday);
>
> }
> else
> {
> var last = new Date(date.Year, date.Month,
> 1).AddMonths(1).AddDays(-1);
> return ((last.Day - date.Day) / 7 == (Math.Abs(n) - 1)) &&
> (date.DayOfWeek == weekday);
> }
> }
>
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