获取特定月份的开始日期和结束日期

Question

int months = applicationLookBack.LookBackPeriod; //In Months

public class DateRange 
{
     public virtual DateTime? Startdate { get; set; }
     public virtual DateTime? Enddate { get; set; }
}

What will be the best way to calculate and fill this DateRange with the month count?

Answer 1

    int months = 14;
    int currentYear = DateTime.Now.Year;

    DateTime firstDate = new DateTime(currentYear, 1, 1);
    DateTime lastDate = firstDate.AddMonths(months - 1);

    var lastMonthDays = DateTime.DaysInMonth(lastDate.Year, lastDate.Month);
    lastDate = lastDate.AddDays(lastMonthDays - 1);