<pre name="code" class="csharp"> //獲取本月份天數
int days = System.Threading.Thread.CurrentThread.CurrentUICulture.Calendar.GetDaysInMonth(dt.Year, dt.Month);
//15號日期
DateTime dt15 =Convert.ToDateTime(dt.ToString("MM-15"));
//月底日期
DateTime dt30 = Convert.ToDateTime(dt.ToString("MM-"+days+""));
//第一個返息日
DateTime dtFirst;
if (dt > dt15)
{
dtFirst = dt30;
}
else
{
dtFirst = dt15;
}
/// <summary>
/// 日期天數差
/// </summary>
/// <param name="DateTime1"></param>
/// <param name="DateTime2"></param>
/// <returns></returns>
private int DateDiff(DateTime DateTime1, DateTime DateTime2)
{
string dateDiff = null;
TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
TimeSpan ts = ts1.Subtract(ts2).Duration();
dateDiff = ts.Days.ToString(); //+ "天"; +ts.Hours.ToString() + "小時" + ts.Minutes.ToString() + "分鐘" + ts.Seconds.ToString() + "秒";
return Convert.ToInt32(dateDiff);
}