The column format applied through the .Format() option is ignored, if the column is bound to a nullable DateOnly field.
public DateOnly? PaymentDate { get; set; }
columns.Bound(p => p.PaymentDate).Title("Date").Format("{0:MM/dd/yyyy}").Width(160);
The specified format is ignored, e.g., the Grid shows 2025-01-21, instead of 01/21/2025
The specified column format is applied.