c# 根据日期获取星期方法

protected void Page_Load(object sender, EventArgs e)

{

int m = System.DateTime.Today.Month;

int y = System.DateTime.Today.Year;

int d = System.DateTime.Today.Day;

int weeks = getWeekDay(y, m, d);

switch (weeks)

{

case 1:

this.TextBox1.Text = "星期一";

break;

case 2:

this.TextBox1.Text = "星期二";

break;

case 3:

this.TextBox1.Text = "星期三";

break;

case 4:

this.TextBox1.Text = "星期四";

break;

case 5:

this.TextBox1.Text = "星期五";

break;

case 6:

this.TextBox1.Text = "星期六";

break;

case 7:

this.TextBox1.Text = "星期日";

break;

}

}

/// <summary>根据日期，获得星期几</summary>

/// <param name="y">年</param>

/// <param name="m">月</param>

/// <param name="d">日</param>

/// <returns>星期几，1代表星期一；7代表星期日</returns>

public static int getWeekDay(int y, int m, int d)

{

if (m == 1) m = 13;

if (m == 2) m = 14;

int week = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7 + 1;

return week;

}