Hi Pablo,
We have prepared a sample to achieve your requirement of
“Changing opacity to 1 for the dates that are not part of present month”. In
the attached sample we have edited the style of ‘CalendarDayButton’ class and
the templates are applied using CellTemplate property.
Please find the sample in below link,
calendar_opacity.zip
Please let us know if you have any queries,
Regards,
Vignesh V