Hello Dmitry,
I have several .gan files. Should I then copy the plain text of the holidays to each and every .gan file to add the 2022 holidays?
Here is my way to contribute and have that data available for any other Ganttproject user interested in 2022 holidays in Spain.
<calendars base-id="es">
<day-types>
<day-type id="0"/>
<day-type id="1"/>
<default-week id="1" name="default" sun="1" mon="0" tue="0" wed="0" thu="0" fri="0" sat="1"/>
<only-show-weekends value="false"/>
<overriden-day-types/>
<days/>
</day-types>
<date year="" month="1" date="1" type="HOLIDAY">
<![CDATA[Año Nuevo]]>
</date>
<date year="" month="1" date="6" type="HOLIDAY">
<![CDATA[Reyes Magos]]>
</date>
<date year="" month="5" date="1" type="HOLIDAY">
<![CDATA[Fiesta del Trabajo]]>
</date>
<date year="" month="8" date="15" type="HOLIDAY">
<![CDATA[Asunción]]>
</date>
<date year="" month="10" date="12" type="HOLIDAY">
<![CDATA[Fiesta Nacional]]>
</date>
<date year="" month="11" date="1" type="HOLIDAY">
<![CDATA[Todos los Santos]]>
</date>
<date year="" month="12" date="6" type="HOLIDAY">
<![CDATA[Constitución]]>
</date>
<date year="" month="12" date="8" type="HOLIDAY">
<![CDATA[Inmaculada Concepción]]>
</date>
<date year="" month="12" date="25" type="HOLIDAY">
<![CDATA[Christmas Day]]>
</date>
<date year="" month="11" date="9" type="HOLIDAY">
<![CDATA[Almudena (MADRID)]]>
</date>
<date year="" month="5" date="2" type="HOLIDAY">
<![CDATA[Comunidad MADRID]]>
</date>
<date year="" month="7" date="25" type="HOLIDAY">
<![CDATA[Santiago]]>
</date>
<date year="2020" month="11" date="2" type="HOLIDAY">
<![CDATA[All Saints Day (in lieu)]]>
</date>
<date year="2020" month="12" date="7" type="HOLIDAY">
<![CDATA[Constitution Day (in lieu)]]>
</date>
<date year="2021" month="3" date="19" type="HOLIDAY">
<![CDATA[San José 2021]]>
</date>
<date year="2021" month="5" date="3" type="HOLIDAY">
<![CDATA[Com MADRID 2021]]>
</date>
<date year="2021" month="4" date="1" type="HOLIDAY">
<![CDATA[Jueves Santo]]>
</date>
<date year="2021" month="4" date="2" type="HOLIDAY">
<![CDATA[Viernes Santo]]>
</date>
<date year="2021" month="5" date="4" type="HOLIDAY">
<![CDATA[Elecciones CAM]]>
</date>
<date year="2021" month="10" date="11" type="HOLIDAY">
<![CDATA[Días festivos en 11/10/21 0:00]]>
</date>
<date year="2021" month="11" date="8" type="HOLIDAY">
<![CDATA[Días festivos en 8/11/21 0:00]]>
</date>
<date year="2021" month="12" date="7" type="HOLIDAY">
<![CDATA[Días festivos en 7/12/21 0:00]]>
</date>
<date year="2022" month="4" date="14" type="HOLIDAY">
<![CDATA[Jueves Santo]]>
</date>
<date year="2022" month="4" date="15" type="HOLIDAY">
<![CDATA[Viernes Santo]]>
</date>
<date year="2022" month="12" date="26" type="HOLIDAY">
<![CDATA[Navidad 2022]]>
</date>
<date year="2022" month="5" date="16" type="HOLIDAY">
<![CDATA[Madrid San Isidro]]>
</date>
</calendars>