Apache OpenOffice (AOO) Bugzilla – Issue 87259
Roman numerals with number format MMM not fully implemented
Last modified: 2017-05-20 11:33:51 UTC
Czech localization seems to use roman numerals for short month names. But when you enter roman numerals in a sheet cell, they denote a date value only if it is a single i, v or x. See http://user.services.openoffice.org/en/forum/viewtopic.php?f=9&t=3609 for more details.
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