I see. The logic must be including the initial activity if it intersects since this only happens with the first day. We can look at changing this but the modification I suggested would deal with it without any adverse affects. i.e.

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            var d  = DateTime.Now.AddDays(2); 
            var d1 = new DateTime(d.Year, d.Month, d.Day, 0, 0, 0);
            var d2 = new DateTime(d.Year, d.Month, d.Day, 23, 59, 59);

            var localRange = new Infragistics.DateRange( d1 );

            var result = dataManager.GetActivities(new ActivityQuery(
                ActivityTypes.Appointment,
                new DateRange( localRange.Start.ToUniversalTime(), localRange.End.ToUniversalTime() ),
                calendars[0]));

            var localToken = dataManager.DataConnector.TimeZoneInfoProviderResolved.LocalToken;
            string activities = "";
            int i = 1;
            foreach (Appointment app in result.Activities)
            {
                if ( app.GetEndLocal( localToken ) == localRange.Start && app.Start != app.End )
                    continue;

                activities += i + ": " + app.Subject + "\n";
                i++;
            }
            Console.WriteLine(activities);

            localRange = new DateRange( d1, d2 );
                  
             result = dataManager.GetActivities(new ActivityQuery(
                ActivityTypes.Appointment,
                new DateRange( localRange.Start.ToUniversalTime(), localRange.End.ToUniversalTime() ),
                calendars[0]));

             activities = "";
             i = 1;
            foreach (Appointment app in result.Activities)
            {
                if ( app.GetEndLocal( localToken ) == localRange.Start && app.Start != app.End )
                    continue;

                activities += i + ": " + app.Subject + "\n";
                i++;
            }
            Console.WriteLine(activities);
        }

Hallo Andrew,

thanks for the quick replay.

Please please change the method used in the example AddDays 2days then only one activity displayed.
that would have to be linear behavior

Thank you.

The range you are passing is in a 0 minute range starting at midnight (e.g. Monday 1/21/2013 00:00:00). The query manager returns all activities that intersect with this time. In your case you have 2 day long activities so one goes from Sunday 1/20/2013 00:00:00 to Monday 1/21/2013 00:00:00 and another goes from Monday 1/21/2013 00:00:00 to Tuesday 1/21/2013 00:00:00. Since you have 2 activities that intersect with Monday 1/21/2013 00:00:00 you get 2 results. Now the display/view controls treat the end date as exclusive (unless the activity is a 0 minute activity) so the view would skip that activity but the query result doesn't assume that so you get both. If you want to ignore the end time as well then you might do something like:

var localRange = new Infragistics.DateRange( d1 );
var utcRange = new DateRange( localRange.Start.ToUniversalTime(), localRange.End.ToUniversalTime() );

var result = dataManager.GetActivities(new ActivityQuery(
    ActivityTypes.Appointment,
    utcRange,
    calendars[0]));

var localToken = dataManager.DataConnector.TimeZoneInfoProviderResolved.LocalToken;
string activities = "";
int i = 1;
foreach (Appointment app in result.Activities)
{
    if ( app.GetEndLocal( localToken ) == localRange.Start && app.Start != app.End )
        continue;

Hello Krasimir

I modified the example again.
Please look at the issue ... now the next day, two Activities displayed.