Bug 105174 - IsLeapYear function gives erratic results.
Summary: IsLeapYear function gives erratic results.
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Calc (show other bugs)
(earliest affected) release
Hardware: x86-64 (AMD64) Linux (All)
: medium minor
Assignee: Not Assigned
Depends on:
Blocks: Calc-Function
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Reported: 2017-01-07 14:48 UTC by Louie
Modified: 2018-03-02 10:06 UTC (History)
4 users (show)

See Also:
Crash report or crash signature:

Known correct determinations of leap years vs isleapyear() function (239.20 KB, application/pdf)
2017-01-11 03:09 UTC, Louie

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Description Louie 2017-01-07 14:48:54 UTC
Testing confirms many leap years return 0, "not leap"; some non-leap years return 1, "are leap", some return correct results. Same results in version build ID 1:5.1.4-0ubunto1 and version Build ID: 40m0(Build:2)

Range years tested 0 - 3000.
Comment 1 Regina Henschel 2017-01-07 15:33:31 UTC
Please be more specific, which cases give a wrong result and why you think, that the result is wrong.
Comment 2 Louie 2017-01-11 03:09:39 UTC
Created attachment 130310 [details]
Known correct determinations of leap years vs isleapyear() function

Sequence of 3001 years tested in 4 known correct methods of determining leap year are used as arguments to isleapyear() function resulting in many false positives and many missed leap years.
Comment 3 GerardF 2017-01-11 10:35:31 UTC
A calc sheet would had been more usefull than a pdf.
We can't see how you are trying to use this function.

ISLEAPYEAR need a true date as argument, see the help for a correct use of the function :
Comment 4 Louie 2017-01-13 02:18:02 UTC
What is needed?
Comment 5 Xisco Faulí 2017-01-13 12:03:58 UTC
(In reply to Louie from comment #4)
> What is needed?

As said in comment 3, could you please attach a calc sheet ?
Comment 6 QA Administrators 2018-01-29 10:27:57 UTC Comment hidden (obsolete)
Comment 7 QA Administrators 2018-03-02 10:06:20 UTC
Dear Bug Submitter,

Please read this message in its entirety before proceeding.

Your bug report is being closed as INSUFFICIENTDATA due to inactivity and
a lack of information which is needed in order to accurately
reproduce and confirm the problem. We encourage you to retest
your bug against the latest release. If the issue is still
present in the latest stable release, we need the following
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