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Gets whether the horizontal axis of the sparkline is based on date values.
Returns true when the sparkline group uses a date range for its
horizontal axis.
bool IsDateAxis { get; }
ReadOnly Property IsDateAxis As Boolean
worksheet.Range["A1:A4"].Value = new object[,] {{2}, {5}, {3}, {6}};
worksheet.Range["C1:C4"].Value = new object[,] {{"2024/1/1"}, {"2024/1/3"}, {"2024/1/6"}, {"2024/1/10"}};
ISparklineGroup group = worksheet.Range["B1"].SparklineGroups.Add(SparkType.Line, "A1:A4");
group.DateRange = "C1:C4";
ISparkHorizontalAxis horizontalAxis = group.Axes.Horizontal;
bool isDateAxis = horizontalAxis.IsDateAxis;