如何计算未来指定时间段的日期？

Question

我有这个：

string dataNow = DateTime.Today.tostring();
string dateAfter = dateNow + ( 20 days);

如何在20天内找到日期？
如何查找当月的天数？

Answer 1

您可能的意图是将日期作为日期类型DateTime。在这种情况下，请勿在完成操作日期之前调用ToString()：

string dataNow = DateTime.Today.AddDays(20).ToString();

DateTime.AddDays

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更新后：

获取当月的天数：

var date = DateTime.Today;
int days = DateTime.DaysInMonth(date.Year, date.Month);

DateTime.DaysInMonth

Answer 2

这应该这样做：

    DateTime dtNow = DateTime.Today;
    string dateNow = dtNow.ToString();
    string dateAfter = dtNow.AddDays(20).ToString();
    int DaysInTheMonth = DateTime.DaysInMonth(dtNow.Year, dtNow.Month);

Answer 3

DateTime today = DateTime.Today;
DateTime later = today.AddDays(20);

string todayAsString = today.ToString("d");
string laterAsString = later.ToString("d");

int daysThisMonth = DateTime.DaysInMonth(today.Year, today.Month);
int daysLaterMonth = DateTime.DaysInMonth(later.Year, later.Month);