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Gets or sets the first date included in the grouped range.
When AutoStart is true, this value is ignored and the first date is determined from the PivotCache.
public DateTime? Start { get; set; }
Public Property Start As Date?
PivotFieldDateGroupOptions options = new PivotFieldDateGroupOptions();
options.Start = new DateTime(2024, 1, 1);
DateTime? start = options.Start;