FileSystemService.getLastModifiedTimeById Method
        
 Gets the file's last modified time for cache comparison.
 
         
        Parameters
        
            - id
            
 
            - 
                
Type: String
The ID of the file or folder to get the last modified time of. 
        
        Return Value
        
Type: jQuery.Promise
        
Value: Date
        
A promise object that is resolved when the call is complete.
 If successful, a Date object is returned.