Get-PnPSite Get-SPOSite LastItemModifiedDate LastItemUserModifiedDate LastContentModifiedDate #166
              
                
                  
                  
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                    erwinvanhunen
                  
              
          
                  
                    
                      YuriySamorodov
                    
                  
                
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          Answered by
          
            erwinvanhunen
          
      
      
        Jan 25, 2021 
      
    
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| The first: the last modified date of any content in any of the webs that make up the site collection | 
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        YuriySamorodov
  
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The first: the last modified date of any content in any of the webs that make up the site collection
The second: the last modified date of items in that specific web. (e.g. the first one is an aggregation of these for each web)
The last: the last modified date a -user- has been modifying an item in the web. The first two also report changes done by the system/server.