C# instance code for calculating the day of the week based on dates

This example uses the Kim Larson calculation formula to calculate the day of the week based on the date:

First, let’s take a look at the definition of the Kim Larson calculation formula in Baidu Encyclopedia:

Kim Larson Calculation Formula

W= (d+2*m+3*(m+1)/5+y+y/4-y/100+y/400) mod 7

In the formula, d represents the number of days in the date, m represents the number of months, and y represents the number of years.

Note: There is a difference in the formula from other formulas:

Consider January and February as the thirteenth and fourteenth months of the previous year. For example: if it is 2004-1-10, it will be converted into: 2003-13-10 to substitute the formula to calculate.

1. Client (called in ajax mode):

$.get('CaculateWeekDay', { y: 2016, m: 8, d: 9 }, function (result) {
alert(result);
})

2. Server:

/// <summary>
/// Calculate the specific date of the week/// </summary>
/// <param name="y">year</param>/// <param name="m">month</param>/// <param name="d">Day</param>/// &lt;returns&gt;&lt;/returns&gt;
public string CaculateWeekDay(int y, int m, int d) 
{
if (m == 1 || m == 2) 
{
m += 12;
y--;
}
int week = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7;
string weekstr = "";
switch (week)
{
case 0: weekstr = "Monday"; break;
case 1: weekstr = "Tuesday"; break;
case 2: weekstr = "Wednesday"; break;
case 3: weekstr = "Thursday"; break;
case 4: weekstr = "Friday"; break;
case 5: weekstr = "Saturday"; break;
case 6: weekstr = "Skies"; break;
}
return weekstr;
}

The above is the example code for C# calculation of the day of the week based on dates introduced by the editor. I hope it will be helpful to everyone. If you have any questions, please leave me a message and the editor will reply to everyone in time. Thank you very much for your support for my website!