how can I show yesterday's page view statistics in Kentico?

This is mainly an example Web Part. I'd recommend to clone it and create your own Web Part.

You can alter this one, but it might break functionality on other places or when applying upgrades or a hotfix.

That being said; When you've cloned it:

You have to alter the Web Part Properties and Code. In Kentico:

In Code:

In the ReloadData() method you can extend the switch logic for the StatisticsType based on what you extended in the previous step setting the fromDate (00:00 yesterday) and toDate (23:59? yesterdaor 00:00 today) values.

@David I used below codes to show yesterday case 5: { fromDate = fromDate.AddDays(-1); toDate = DateTimeHelper.GetDayStart(DateTime.Now); interval = HitsIntervalEnum.Day; } break; Is it correct?

Allmost, think you also need to round the FromDate.

So something like:

case 5:
    {
        fromDate = DateTimeHelper.GetDayStart(fromDate.AddDays(-1));
        toDate = DateTimeHelper.GetDayStart(toDate);
        interval = HitsIntervalEnum.Day;
    }
    break;

Since both to and from properties are already set I'd use those instead of adding a new DateTime.Now. But the result would be the same :)

Cross posted here, with the answer.