The algorithm is as follows: Kelason Computational Formula W = (D 2 * m 3 * (M 1) / 5 Y Y / 4-Y / 100 Y / 400) MOD 7 in the formula D The number of days in the date, M represents the number of months, y indicates the number of years. Note: There is a different place in the formula: seeing January and February as the last year of the last year of the last year of the last year of the last year of the last year of the last year, the example: If it is 2004-10, the exchange is: 2003- 13-10 Come to the formula calculation. The code is as follows: // Y-year, M-month, D-date String Caculateweekday (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; string weekstr = ""; switch (week) {cas 1: Weekstr = "Monday"; Break; Case 2: Weekstr = "Tuesday"; Break; Case 3: Weekstr = "Wednesday"; Break; Case 4: Weekstr = "Thursday"; Break; Case 5: Weekstr = " Friday "; Break; Case 6: Weekstr =" Saturday "; Break; Case 7: Weekstr =" Sunday "; Break;} Return Weekstr;} Call method: label2.text = CaculateWeekDay (2004, 12, 9);
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