using System;
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using System.Globalization;
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namespace Common
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{
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public class DateTimeHelper
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{
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public static string GetToday()
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{
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return DateTime.Now.ToString("yyyy-MM-dd");
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}
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public static string GetToday(string format)
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{
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return DateTime.Now.ToString(format);
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}
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public static string GetDate(int i)
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{
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return DateTime.Now.AddDays((double)i).ToString("yyyy-MM-dd");
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}
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public static string GetNumberWeekDay(DateTime dt)
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{
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int y = dt.Year;
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int i = dt.Month;
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int d = dt.Day;
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if (i < 3)
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{
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i += 12;
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y--;
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}
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if (y % 400 == 0 || (y % 100 != 0 && y % 4 == 0))
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{
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d--;
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}
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else
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{
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d++;
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}
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return ((d + 2 * i + 3 * (i + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7).ToString();
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}
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public string GetChineseWeekDay(int y, int m, int d)
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{
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string[] weekstr = new string[]
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{
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"日",
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"一",
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"二",
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"三",
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"四",
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"五",
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"六"
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};
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if (m < 3)
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{
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m += 12;
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y--;
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}
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if (y % 400 == 0 || (y % 100 != 0 && y % 4 == 0))
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{
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d--;
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}
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else
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{
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d++;
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}
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return "星期" + weekstr[(d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7];
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}
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public static int GetDaysOfYear(int iYear)
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{
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return DateTimeHelper.IsRuYear(iYear) ? 366 : 365;
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}
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public static int GetDaysOfYear(DateTime dt)
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{
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return DateTimeHelper.IsRuYear(dt.Year) ? 366 : 365;
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}
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public static int GetDaysOfMonth(int iYear, int Month)
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{
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int days = 0;
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switch (Month)
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{
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case 1:
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days = 31;
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break;
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case 2:
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days = (DateTimeHelper.IsRuYear(iYear) ? 29 : 28);
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break;
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case 3:
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days = 31;
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break;
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case 4:
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days = 30;
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break;
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case 5:
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days = 31;
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break;
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case 6:
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days = 30;
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break;
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case 7:
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days = 31;
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break;
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case 8:
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days = 31;
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break;
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case 9:
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days = 30;
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break;
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case 10:
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days = 31;
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break;
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case 11:
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days = 30;
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break;
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case 12:
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days = 31;
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break;
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}
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return days;
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}
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public static int GetDaysOfMonth(DateTime dt)
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{
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int days = 0;
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int year = dt.Year;
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switch (dt.Month)
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{
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case 1:
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days = 31;
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break;
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case 2:
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days = (DateTimeHelper.IsRuYear(year) ? 29 : 28);
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break;
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case 3:
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days = 31;
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break;
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case 4:
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days = 30;
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break;
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case 5:
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days = 31;
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break;
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case 6:
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days = 30;
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break;
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case 7:
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days = 31;
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break;
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case 8:
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days = 31;
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break;
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case 9:
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days = 30;
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break;
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case 10:
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days = 31;
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break;
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case 11:
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days = 30;
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break;
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case 12:
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days = 31;
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break;
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}
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return days;
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}
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public static string GetWeekNameOfDay(DateTime dt)
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{
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string week = string.Empty;
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switch (dt.DayOfWeek)
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{
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case DayOfWeek.Sunday:
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week = "星期日";
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break;
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case DayOfWeek.Monday:
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week = "星期一";
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break;
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case DayOfWeek.Tuesday:
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week = "星期二";
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break;
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case DayOfWeek.Wednesday:
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week = "星期三";
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break;
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case DayOfWeek.Thursday:
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week = "星期四";
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break;
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case DayOfWeek.Friday:
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week = "星期五";
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break;
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case DayOfWeek.Saturday:
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week = "星期六";
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break;
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}
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return week;
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}
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public static int GetWeekNumberOfDay(DateTime dt)
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{
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int week = 0;
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switch (dt.DayOfWeek)
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{
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case DayOfWeek.Sunday:
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week = 7;
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break;
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case DayOfWeek.Monday:
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week = 1;
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break;
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case DayOfWeek.Tuesday:
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week = 2;
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break;
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case DayOfWeek.Wednesday:
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week = 3;
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break;
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case DayOfWeek.Thursday:
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week = 4;
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break;
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case DayOfWeek.Friday:
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week = 5;
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break;
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case DayOfWeek.Saturday:
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week = 6;
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break;
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}
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return week;
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}
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public static int GetWeekAmount(int year)
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{
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DateTime end = new DateTime(year, 12, 31);
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GregorianCalendar gc = new GregorianCalendar();
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return gc.GetWeekOfYear(end, CalendarWeekRule.FirstDay, DayOfWeek.Monday);
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}
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public static int GetWeekOfYear(DateTime dt)
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{
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GregorianCalendar gc = new GregorianCalendar();
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return gc.GetWeekOfYear(dt, CalendarWeekRule.FirstDay, DayOfWeek.Monday);
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}
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public static void WeekRange(int year, int weekOrder, ref DateTime firstDate, ref DateTime lastDate)
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{
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DateTime firstDay = new DateTime(year, 1, 1);
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int firstOfWeek = Convert.ToInt32(firstDay.DayOfWeek);
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int dayDiff = -1 * firstOfWeek + 1;
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int dayAdd = 7 - firstOfWeek;
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firstDate = firstDay.AddDays((double)dayDiff).Date;
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lastDate = firstDay.AddDays((double)dayAdd).Date;
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if (weekOrder != 1)
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{
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int addDays = (weekOrder - 1) * 7;
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firstDate = firstDate.AddDays((double)addDays);
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lastDate = lastDate.AddDays((double)addDays);
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}
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}
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public static int DiffDays(DateTime dtfrm, DateTime dtto)
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{
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return (dtto.Date - dtfrm.Date).Days;
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}
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private static bool IsRuYear(int iYear)
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{
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return iYear % 400 == 0 || (iYear % 4 == 0 && iYear % 100 != 0);
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}
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public static DateTime ToDate(string strInput)
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{
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DateTime oDateTime;
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try
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{
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oDateTime = DateTime.Parse(strInput);
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}
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catch (Exception)
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{
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oDateTime = DateTime.Today;
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}
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return oDateTime;
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}
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public static string ToString(DateTime oDateTime, string strFormat)
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{
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string strDate;
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try
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{
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string text = strFormat.ToUpper();
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if (text != null)
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{
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if (text == "SHORTDATE")
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{
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strDate = oDateTime.ToShortDateString();
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goto IL_47;
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}
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if (text == "LONGDATE")
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{
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strDate = oDateTime.ToLongDateString();
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goto IL_47;
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}
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}
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strDate = oDateTime.ToString(strFormat);
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IL_47: ;
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}
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catch (Exception)
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{
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strDate = oDateTime.ToShortDateString();
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}
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return strDate;
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}
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}
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}
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