On Tue, May 8, 2018 at 9:14 AM, Ted Roche <tedroche@gmail.com> wrote:

> So, do you want a function that returns the second Tuesday in May or

> one that returns the Tuesday closest to May 8? Both would fit the

> specs.

>

> Date math was one of my many VFP hobbies. There were lots of date math

> answers in Ask Advisor.

>

> GOMONTH() gets you to the year you want, then you can use DOW() to

> figure out the day of the week that date has, then add/subtract to get

> to the Tuesday you're after.

>

I know there's a better algorithm to do this, but this might work...

function olddate(thedate, offset)

* parameters: thedate: date to start from

* offset: number of years offset, positive or negative

* returns: nearest date to the offset that falls on the same day of the week

local thedow, thenewdow, thediff, theoffset

thedow = dow(thedate)

thenewdow = dow(gomonth(thedate, offset*12))

thediff = thedow - thenewdow

theoffset = iff(thediff>3, 7-thediff, thediff)

return gomonth(thedate, offset*12) + thediff

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