Hello Real,

The easiest way to make all the week day and month names to show in French, or any other language, is to set the CurentCulture and CurentUICulture of your application to French CultureInfo. To do so add these two rows in the very beginning of your application’s Main method:

Thread.CurrentThread.CurrentCulture = new CultureInfo("fr-FR");
Thread.CurrentThread.CurrentUICulture = new CultureInfo("fr-FR");

You may check this article in MSDN for additional information “How to: Set the Culture and UI Culture for Windows Forms Globalization”. I am not sure what you have changed in your UltraCalendarInfo, but this should be enough to force your application to show each localizable string in French.

If you need to change the way strings are shown in UltraTimeLineView header you may set HeaderTextFormat like this:

this.ultraTimelineView1.PrimaryInterval.HeaderTextFormat = "dddd, MMMM d, yyyy";

Attached is a small sample project showing how to localize you application.

Please check my sample and let me know if you have any additional questions.

https://www.infragistics.com/my-account/support-activity

In the mean time you may try to set / reset the UI culture in Activated / Deactivate events of your form. However, I do not know what your application logic is, so cannot tell you where is the best place to set / reset the UI culture is.

We have investigated this further and this seems to be expected behavior. LongDescription and ShortDescription properties are not supposed to affect the TimeLine headers. They are for cases where the control displays the names by itself. The headers of the TimeLineView format a particular DateTime. To format the headers you may handle ColumnHeaderInitializing event. In this event you can set the header text like this:

private CultureInfo fr = new CultureInfo("fr-FR");

private void UltraTimelineView1_ColumnHeaderInitializing(object sender, ColumnHeaderInitializingEventArgs e)
{
    e.Text = e.DateTimeRange.StartDateTime.ToString("dddd, MMMM d, yyyy", this.fr);
}

Attached is a small sample project showing how you can format header's text by the help of this event.

Please let me know if any additional questions arise.