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Arcade Date expression for symbology in ArcGIS Pro 2.2.0

Question asked by bruce.j.anderson on Jun 29, 2018
Latest reply on Jun 29, 2018 by bruce.j.anderson

Arcade Date expression for symbology in ArcGIS Pro 2.2.0

I'm trying to use an Arcade expression to symbolize data based on a date field. I want to display records for each Year/Month combination. the expression verifies and seems to work but if I look at the counts for the year/month groupings they are off by one month. e.g. the number of records for 2018/5 are showing as 2018/4. Any idea what might be causing this? 

 

here is the expression that I'm using: 

Year($feature.observation_date) + "/" + Month($feature.observation_date)

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