C# 我怎样才能知道一个月的哪一天?
我必须找出给定日期的月份,比如说我有2020年1月26日的日期,现在26日是该月的第4个星期日,我如何才能找到月份中可重复计数的日期?没有直接的方法来实现这一点。您需要调用以下代码C# 我怎样才能知道一个月的哪一天?,c#,date,dayofweek,dayofmonth,C#,Date,Dayofweek,Dayofmonth,我必须找出给定日期的月份,比如说我有2020年1月26日的日期,现在26日是该月的第4个星期日,我如何才能找到月份中可重复计数的日期?没有直接的方法来实现这一点。您需要调用以下代码 DateTime dateValue = new DateTime(2019, 12, 19); int getDayOfWeek = GetWeekNumberOfMonth(dateValue); //convert to ordinal string ordin
DateTime dateValue = new DateTime(2019, 12, 19);
int getDayOfWeek = GetWeekNumberOfMonth(dateValue);
//convert to ordinal
string ordinalWeekOfMonth = AddOrdinal(getDayOfWeek);
Console.WriteLine(ordinalWeekOfMonth + " " + dateValue.DayOfWeek);//output like 2nd sunday
以下依赖方法可用于调用上述代码
public static int GetWeekNumberOfMonth(DateTime date)
{
date = date.Date;
DateTime firstMonthDay = new DateTime(date.Year, date.Month, 1);
DateTime firstMonthMonday = firstMonthDay.AddDays((DayOfWeek.Monday + 7 - firstMonthDay.DayOfWeek) % 7);
if (firstMonthMonday > date)
{
firstMonthDay = firstMonthDay.AddMonths(-1);
firstMonthMonday = firstMonthDay.AddDays((DayOfWeek.Monday + 7 - firstMonthDay.DayOfWeek) % 7);
}
return (date - firstMonthMonday).Days / 7 + 1;
}
public static string AddOrdinal(int num)
{
if (num <= 0) return num.ToString();
switch (num % 100)
{
case 11:
case 12:
case 13:
return num + "th";
}
switch (num % 10)
{
case 1:
return num + "st";
case 2:
return num + "nd";
case 3:
return num + "rd";
default:
return num + "th";
}
}
public static int GetWeekNumberOfMonth(日期时间日期)
{
日期=日期。日期;
DateTime firstMonthDay=新的日期时间(date.Year,date.Month,1);
DateTime firstMonthMonday=firstMonthDay.AddDays((DayOfWeek.Monday+7-firstMonthDay.DayOfWeek)%7);
如果(第一个月星期日>日期)
{
firstMonthDay=firstMonthDay.AddMonths(-1);
firstMonthMonday=firstMonthDay.AddDays((DayOfWeek.Monday+7-firstMonthDay.DayOfWeek)%7);
}
返回(日期-第一个月的星期一)。天/7+1;
}
公共静态字符串AddOrdinal(int num)
{
如果(num)你问的是什么语言?我需要C语言。