Antero, Thanks for your answer.
I had tried to use the post that you recommended.
But I can't find this file "date.xsl" (broken link to http://exslt.org/date/date.zip).
So, I found the "date.xsl" in https://github.com/bzerangue/exslt.org/blob/master/date/date.xsl (I dont know if is the same)
When I import this file to ItemStyle.xsl, all CQWP of the site display errors.
Here my header of ItemStyle.xsl:
<xsl:stylesheet
version="1.0"
exclude-result-prefixes="x d xsl msxsl cmswrt"
xmlns:x="http://www.w3.org/2001/XMLSchema"
xmlns:d="http://schemas.microsoft.com/sharepoint/dsp"
xmlns:cmswrt="http://schemas.microsoft.com/WebParts/v3/Publishing/runtime"
xmlns:ddwrt="http://schemas.microsoft.com/WebParts/v2/DataView/runtime"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:date="http://exslt.org/dates-and-times"
extension-element-prefixes="date"
xmlns:msxsl="urn:schemas-microsoft-com:xslt">
<xsl:import href="date.xsl" />
Have you a tip to do this work well?
Thx!
Paulo Junior