LB Booster - Nth Day of Month

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Nth Day of Month

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Topic: Nth Day of Month (Read 710 times)

joker
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Re: Nth Day of Month
« Reply #3 on: Sep 5^th, 2016, 09:47am »

on Sep 5^th, 2016, 08:47am, Richard Russell wrote:

... But the Year 2000 bug is shocking, well spotted. wink

Too funny, Richard! Wasn't that the year that we were all supposed to be slung off the Earth never to be heard from again? Perhaps I exaggerate a bit? cheesy

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Jack Kelly
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Re: Nth Day of Month
« Reply #4 on: Sep 5^th, 2016, 11:37am »

I have corrected the issues in the original post, code section. Sorry about the Y2K leap year error. Endless confusion is my normal state-of-mind. Thank you for your feedback. It's always appreciated!

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Richard Russell
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Re: Nth Day of Month
« Reply #5 on: Sep 5^th, 2016, 12:02pm »

on Sep 5^th, 2016, 09:47am, pnlawrence wrote:

Wasn't that the year that we were all supposed to be slung off the Earth never to be heard from again?

In all seriousness this conditional test in Jack's program is surprising:

Code:

if yyyy mod 4 = 0 and yyyy<>2000 then

It was/is quite fortuitous that 2000 (being a multiple-of-400 year) fitted in with the simple leap-year rule because it meant that programs written carelessly, or with an expectation that they wouldn't still be in use by then, nevertheless worked correctly. But there's no accounting for somebody inserting a special test for 2000, when it wasn't special!

If the test had said year<>2100 it would have been correct, and we would have been congratulating Jack for his optimism!

Richard.

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