If PHP is not compiled with the --enable-calendar option, this module throws an error when drilling down into facets:
Error: Call to undefined function Drupal\facet_granular_date\Plugin\facets\processor\cal_days_in_month() in Drupal\facet_granular_date\Plugin\facets\processor\DateItemGranularProcessor->createFacets() (line 198 of modules/contrib/facet_granular_date/src/Plugin/facets/processor/DateItemGranularProcessor.php).
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1.0
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