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using System; using System.Globalization; namespace SysBasicClass { public class DateTimeHelper { public static string GetToday() { return DateTime.Now.ToString("yyyy-MM-dd"); } public static string GetToday(string format) { return DateTime.Now.ToString(format); } public static string GetDate(int i) { return DateTime.Now.AddDays((double)i).ToString("yyyy-MM-dd"); } public static string GetNumberWeekDay(DateTime dt) { int num = dt.Year; int num2 = dt.Month; int num3 = dt.Day; if (num2 < 3) { num2 += 12; num--; } if (num % 400 == 0 || (num % 100 != 0 && num % 4 == 0)) { num3--; } else { num3++; } return ((num3 + 2 * num2 + 3 * (num2 + 1) / 5 + num + num / 4 - num / 100 + num / 400) % 7).ToString(); } public string GetChineseWeekDay(int y, int m, int d) { string[] array = new string[] { "日", "一", "二", "三", "四", "五", "六" }; if (m < 3) { m += 12; y--; } if (y % 400 == 0 || (y % 100 != 0 && y % 4 == 0)) { d--; } else { d++; } return "星期" + array[(d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7]; } public static int GetDaysOfYear(int iYear) { if (!DateTimeHelper.IsRuYear(iYear)) { return 365; } return 366; } public static int GetDaysOfYear(DateTime dt) { if (!DateTimeHelper.IsRuYear(dt.Year)) { return 365; } return 366; } public static int GetDaysOfMonth(int iYear, int Month) { int result = 0; switch (Month) { case 1: result = 31; break; case 2: result = (DateTimeHelper.IsRuYear(iYear) ? 29 : 28); break; case 3: result = 31; break; case 4: result = 30; break; case 5: result = 31; break; case 6: result = 30; break; case 7: result = 31; break; case 8: result = 31; break; case 9: result = 30; break; case 10: result = 31; break; case 11: result = 30; break; case 12: result = 31; break; } return result; } public static int GetDaysOfMonth(DateTime dt) { int result = 0; int year = dt.Year; switch (dt.Month) { case 1: result = 31; break; case 2: result = (DateTimeHelper.IsRuYear(year) ? 29 : 28); break; case 3: result = 31; break; case 4: result = 30; break; case 5: result = 31; break; case 6: result = 30; break; case 7: result = 31; break; case 8: result = 31; break; case 9: result = 30; break; case 10: result = 31; break; case 11: result = 30; break; case 12: result = 31; break; } return result; } public static string GetWeekNameOfDay(DateTime dt) { string result = string.Empty; switch (dt.DayOfWeek) { case DayOfWeek.Sunday: result = "星期日"; break; case DayOfWeek.Monday: result = "星期一"; break; case DayOfWeek.Tuesday: result = "星期二"; break; case DayOfWeek.Wednesday: result = "星期三"; break; case DayOfWeek.Thursday: result = "星期四"; break; case DayOfWeek.Friday: result = "星期五"; break; case DayOfWeek.Saturday: result = "星期六"; break; } return result; } public static int GetWeekNumberOfDay(DateTime dt) { int result = 0; switch (dt.DayOfWeek) { case DayOfWeek.Sunday: result = 7; break; case DayOfWeek.Monday: result = 1; break; case DayOfWeek.Tuesday: result = 2; break; case DayOfWeek.Wednesday: result = 3; break; case DayOfWeek.Thursday: result = 4; break; case DayOfWeek.Friday: result = 5; break; case DayOfWeek.Saturday: result = 6; break; } return result; } public static int GetWeekAmount(int year) { DateTime time = new DateTime(year, 12, 31); GregorianCalendar gregorianCalendar = new GregorianCalendar(); return gregorianCalendar.GetWeekOfYear(time, CalendarWeekRule.FirstDay, DayOfWeek.Monday); } public static int GetWeekOfYear(DateTime dt) { GregorianCalendar gregorianCalendar = new GregorianCalendar(); return gregorianCalendar.GetWeekOfYear(dt, CalendarWeekRule.FirstDay, DayOfWeek.Monday); } public static void WeekRange(int year, int weekOrder, ref DateTime firstDate, ref DateTime lastDate) { DateTime dateTime = new DateTime(year, 1, 1); int num = Convert.ToInt32(dateTime.DayOfWeek); int num2 = -1 * num + 1; int num3 = 7 - num; firstDate = dateTime.AddDays((double)num2).Date; lastDate = dateTime.AddDays((double)num3).Date; if (weekOrder != 1) { int num4 = (weekOrder - 1) * 7; firstDate = firstDate.AddDays((double)num4); lastDate = lastDate.AddDays((double)num4); } } public static int DiffDays(DateTime dtfrm, DateTime dtto) { return (dtto.Date - dtfrm.Date).Days; } private static bool IsRuYear(int iYear) { return iYear % 400 == 0 || (iYear % 4 == 0 && iYear % 100 != 0); } public static DateTime ToDate(string strInput) { DateTime result; try { result = DateTime.Parse(strInput); } catch (Exception) { result = DateTime.Today; } return result; } public static string ToString(DateTime oDateTime, string strFormat) { string result; try { string text = strFormat.ToUpper(); if (text != null) { if (text == "SHORTDATE") { result = oDateTime.ToShortDateString(); goto IL_41; } if (text == "LONGDATE") { result = oDateTime.ToLongDateString(); goto IL_41; } } result = oDateTime.ToString(strFormat); IL_41:; } catch (Exception) { result = oDateTime.ToShortDateString(); } return result; } } } 优化代码