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[英]How to get start and end date of week by using week number and year and insert those dates into mysql table in c#
[英]Given a week number in C#, how can I gain start and end dates of that week?
我想編寫一個函數,該函數在一年中獲取星期數,並返回該星期的開始日期。 另外一個獲取周數並返回該周結束日期的函數。
偽代碼:
public DateTime GetSaturdayDateOfWeek(int weekNumberInYear)
{
// calculations, that finds the Saturday of that week, 00:00:00 of midnight
return DateTime.Now;
}
public DateTime GetFriddayDateOfWeek(int weekNumberInYear)
{
// calculations, that finds the Friday of that week, 23:59:59
return DateTime.Now;
}
如何計算這些日期?
這個問題在PHP中 ,對我沒有幫助。 這個問題也得到一個月的星期數 。 我有一年中的星期幾。
它不是很漂亮,並且Zohar Peled的評論非常有效,但這適用於“正常”(缺少更好的單詞)日歷。 (即:沒有本地化,沒有什么特別的)這應該提供足夠的基礎。
public DateTime GetSaturdayDateOfWeek(int weekNumberInYear)
{
var myDate = new DateTime(DateTime.Now.Year, 1, 1);
myDate = myDate.AddDays((weekNumberInYear -1)* 7);
if (myDate.DayOfWeek < DayOfWeek.Saturday)
{
myDate = myDate.AddDays(DayOfWeek.Saturday - myDate.DayOfWeek);
}
if (myDate.DayOfWeek > DayOfWeek.Saturday)
{
myDate = myDate.AddDays(myDate.DayOfWeek - DayOfWeek.Saturday);
}
return myDate;
}
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