Well, that's actually exactly what this plugin is.

<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
  <ShortName>InterSystems</ShortName>
  <Description>Latest InterSystems documentation search</Description>
  <InputEncoding>UTF-8</InputEncoding>
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
</Image>
<Url type="text/html" method="GET" template="http://docs.intersystems.com/latest/csp/docbook/DocBook.UI.SearchPageZen.cls" rel="searchform">
  <Param name="KeyWord" value="{searchTerms}"/>
</Url>
</OpenSearchDescription>

localeopt parameter solved the problem. This Boolean parameter specifies either the user’s current locale definition or the ODBC locale definition as the source for defaults for the locale-specified parameters dformat, monthlist, yearopt, mindate and maxdate:

  • If localeopt=0, all of these parameters take the current locale definition defaults.
  • If localeopt=1, all of these parameters take the ODBC defaults.

For example:

write $zd($h,11,,,,,,,,1)
>Mon