I have been challenged in finding a way to provide granularity features for contextual filters based on Smart Date fields similar to what I could do with date/time fields in Drupal 7. While the granularity features added to traditional filter handler work very well, the lack of a way to effectively contextualize an argument passed to the view via a contextual filter pretty much stopped one of my projects dead in its tracks.
The traditional filter's granularity options are defined in a handler. Update the argument handler to provide similar functionality in the contextual filters.
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4.2
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