Samuele Locatelli
101 lines
3.9 KiB
C#
101 lines
3.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace EgwCoreLib.Razor.Data
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{
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public class WeekData
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{
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public int anno { get; set; } = DateTime.Today.Year;
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public DateTime inizio { get; set; } = DateTime.Today;
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public DateTime fine { get; set; } = DateTime.Today.AddDays(1);
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public int weekNumber { get; set; } = 1;
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/// <summary>
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/// Calcola estremi settimana dato un giorno come lunedì-domenica
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/// </summary>
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/// <param name="dtRif"></param>
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public WeekData(DateTime dtRif)
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{
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DayOfWeek day = CultureInfo.InvariantCulture.Calendar.GetDayOfWeek(dtRif);
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// attenzione: è domenica = 0 --> in quel caso va portato a 7!!!
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int numDay = day == DayOfWeek.Sunday ? 7 : (int)day;
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this.weekNumber = GetIso8601WeekOfYear(dtRif);
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this.inizio = dtRif.Date.AddDays(1 - numDay);
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this.anno = inizio.Year;
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this.fine = dtRif.Date.AddDays(7 - numDay);
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}
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/// <summary>
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/// Calcola estremi settimana dato numero + anno
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/// </summary>
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/// <param name="numWeek"></param>
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public WeekData(int year, int numWeek)
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{
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this.anno = year;
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this.weekNumber = numWeek;
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DateTime dtRif = FirstDateOfWeekISO8601(year, numWeek);
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DayOfWeek day = CultureInfo.InvariantCulture.Calendar.GetDayOfWeek(dtRif);
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this.inizio = dtRif.Date.AddDays(1 - (int)day);
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this.fine = dtRif.Date.AddDays(7 - (int)day);
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}
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/// <summary>
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/// Calcolo settimana dell'anno ISO 8601
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///
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/// This presumes that weeks start with Monday.
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/// Week 1 is the 1st week of the year with a Thursday in it.
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///
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/// rif: https://stackoverflow.com/questions/11154673/get-the-correct-week-number-of-a-given-date
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/// </summary>
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/// <param name="time"></param>
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/// <returns></returns>
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public static int GetIso8601WeekOfYear(DateTime time)
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{
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// Seriously cheat. If its Monday, Tuesday or Wednesday, then it'll
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// be the same week# as whatever Thursday, Friday or Saturday are,
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// and we always get those right
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DayOfWeek day = CultureInfo.InvariantCulture.Calendar.GetDayOfWeek(time);
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if (day >= DayOfWeek.Monday && day <= DayOfWeek.Wednesday)
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{
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time = time.AddDays(3);
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}
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// Return the week of our adjusted day
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return CultureInfo.InvariantCulture.Calendar.GetWeekOfYear(time, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
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}
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public static DateTime FirstDateOfWeekISO8601(int year, int weekOfYear)
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{
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DateTime jan1 = new DateTime(year, 1, 1);
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int daysOffset = DayOfWeek.Thursday - jan1.DayOfWeek;
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// Use first Thursday in January to get first week of the year as
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// it will never be in Week 52/53
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DateTime firstThursday = jan1.AddDays(daysOffset);
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var cal = CultureInfo.CurrentCulture.Calendar;
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int firstWeek = cal.GetWeekOfYear(firstThursday, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
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var weekNum = weekOfYear;
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// As we're adding days to a date in Week 1,
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// we need to subtract 1 in order to get the right date for week #1
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if (firstWeek == 1)
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{
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weekNum -= 1;
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}
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// Using the first Thursday as starting week ensures that we are starting in the right year
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// then we add number of weeks multiplied with days
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var result = firstThursday.AddDays(weekNum * 7);
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// Subtract 3 days from Thursday to get Monday, which is the first weekday in ISO8601
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return result.AddDays(-3);
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}
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}
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}
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