/// <summary>
/// 현재 분기 첫번째 일자(<see cref="DateTime"/>
/// </summary>
/// <param name="quarter">해당 분기</param>
/// <returns>특정 분기의 첫번째 DateTime <see cref="DateTime"/> (2007-04-01 00:00:00:000)</returns>
public static DateTime GetStartOfQuarter(this Quarters quarter)
{
return(quarter.GetStartOfQuarter(DateTime.Now.Year));
}