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for historic dates before the adoption of the
Gregorian calendar—all dates before 1582, many before 1752, and some as late as the twentieth century. Autoformatting into and out of this format could be misleading or erroneous for dates on the Julian Calendar, if one thought this format was truly ISO
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Even when surrounded by square brackets, those dates that do not contain both a day and a month—such as solitary months, solitary days of the week, solitary years, decades, centuries, and month-year combinations—are not autoformatted. One could make them links by using the standard piped-link
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Autoformatting is implemented by wikilinking dates. The resulting links point to articles on notable events that happened on that particular date or year. Since these lists of historical trivia typically have little or nothing to do with the subject of the article linked from, the links are
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The following table shows how the autoformatting mechanism behaves. The preference settings that a registered user can choose are displayed in the second row. The year and the day-month combination are wikilinked separately, except for dates in the
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Some dates were entered in source code in one or more of the last two formats. While most editors did not notice this, most users saw a format that was much less familiar to them than either MDY or DMY.
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As a result, editors did not notice that the source code often had two (or possibly more) date formats in the same article, while most users saw inconsistent date formats on the same page.
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Links to date ranges in the same calendar month, such as "]" or "the night of ]" cause autoformatting to fail. The autoformatting mechanism will output such dates in a damaged form:
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Autoformatting does not function for piped links to date elements, such as "]" or "]". (Several forms of piped links override the date-formatting function.)
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Date elements on disambiguation pages and section headings should never be linked; the same applies to quotations, unless the original quote is linked.
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Editors are discouraged from using this format since non-registered users, who constitute the majority of readers, may see a hard-to-read date format.
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format. Full date formats not found in the first column are not autoformatted when wikilinked, and are likely to produce a redlink; for instance,
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as in 2001-01-15 (symbolized as YYYY-MM-DD) Though not identified as such on the preferences page, this is the same way dates are displayed in
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Since at least 2004, it has been possible for registered users to set a preference regarding the way dates appear to them. Wikilinking all
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notation, but the same advice applies here: such links should not be created unless they are of high value to the reader. (See
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A combination of a day and a month, plus optionally a year, is autoformatted by adding square brackets,
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superfluous, and only serve to clutter articles unnecessarily. All links from articles should be of
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Dates that are wikilinked (see below) are autoformatted according to the user's chosen preference.
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The square brackets instruct the MediaWiki software to format the item according to a user's
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The following information is provided to document how date autoformatting works.
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Its effects can only be seen by registered editors who select a date preference (
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to all users, regardless of their date preference (or non-preference).
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The last format, being most like ISO 8601, was sometimes referred to as
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ISO format. However, ISO 8601 format implies use of the
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January 15, 2001 (symbolized as MMMM dD, YYYY)
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