Question

我如何才能获得本周四的星期日？例如，本周四是2010年7月8日

Answer 1

您可以使用现有的.NET DateTime执行此操作（难以理解）。诀窍是使用DayOfWeek枚举作为整数 - 因为它以升序数字顺序（0-6）表示太阳 - 星期六。

DateTime someDay = DateTime.Today;
var daysTillThursday = (int)someDay.DayOfWeek - (int)DayOfWeek.Thursday;
var thursday = someDay.AddDays( daysTillThursday );

甚至更简单：

var today = DateTime.Today;
var thursday = today.AddDays(-(int)today.DayOfWeek).AddDays(4);

Answer 2

查看此库：http://datetimeextensions.codeplex.com/

来自主页上的示例：

DateTime nextFriday = DateTime.Now.Next(DayOfWeek.Friday);

Answer 3

DateTime.Today.AddDays(-(int)DateTime.Today.DayOfWeek).AddDays(4)

Answer 4

private static DateTime GetDayOfWeek(DayOfWeek dayOfWeek)
{
    var date = DateTime.Now;
    if (date.DayOfWeek != dayOfWeek)
    {
        var direction = date.DayOfWeek > dayOfWeek ? -1D : 1D;
        do
        {
            date = date.AddDays(direction);
        } while (date.DayOfWeek != dayOfWeek);
    }
    return date;
}

Answer 5

找到最近的星期四的伪代码：

for 0 to 3 as x
    if today + x days is Thursday
        return (today + x days)
    if today - x days is Thursday
        return (today - x days)

本周四发现的伪代码：

lookForward = true
lookBackward = true
FirstDayOfTheWeek = Sunday

for 0 to 6 as x
    if today + x days is FirstDayOfTheWeek
        lookForward = false
    if today - x days is FirstDayOfTheWeek
        lookBackward = false
    if lookForward and today + x days is Thursday
        return (today + x days)
    if lookBackward and today - x days is Thursday
        return (today - x days)

对不起，我不会说C＃：）

Answer 6

// This is fixed...
int thursday = 4;

int difference = thursday - (int)DateTime.Now.DayOfWeek;

DateTime thursdayThisWeek = DateTime.Now.Date.AddDays(difference);

查找当前周的具体日期

6 个答案: