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<base href="https://bugs.documentfoundation.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - ISLEAPYEAR gives FALSE for years displaying Feb 29th"
href="https://bugs.documentfoundation.org/show_bug.cgi?id=144687">144687</a>
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<th>Summary</th>
<td>ISLEAPYEAR gives FALSE for years displaying Feb 29th
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<th>Product</th>
<td>LibreOffice
</td>
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<th>Version</th>
<td>3.4.0 release
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>UNCONFIRMED
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Calc
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<th>Assignee</th>
<td>libreoffice-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>mikekaganski@hotmail.com
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<p>
<div>
<pre>1. Enter number '-292127' in A1, and format as a date
=> it will show 1100-02-29
2. In B1, put formula '=ISLEAPYEAR(A1)'
=> it will show FALSE
The problem is that the date is before introduction of Gregorian calendar
(1582-10-15); the serial dates from that period are displayed using Julian
calendar, but ISLEAPYEAR uses proleptic Gregorian calendar to determine if the
year is leap.</pre>
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