/// <summary>
/// 获取季度的第一天
/// </summary>
/// <param name="month">2018Q1</param>
/// <returns></returns>
public static DateTime ToQuarterFirstday(string quarter)
{
if (quarter == "")
{
quarter = ConvertDateTime.ToYearQuarterString();
}
int yearIndex = ConvertObject.ToInt32(quarter.Substring(0, 4));
int quarterIndex = ConvertObject.ToInt32(quarter.Substring(5, 1));
switch (quarterIndex)
{
case 4:
return(new DateTime(yearIndex, 10, 1));
case 3:
return(new DateTime(yearIndex, 7, 1));
case 2:
return(new DateTime(yearIndex, 4, 1));
default:
return(new DateTime(yearIndex, 1, 1));
}
}
