| public AddWeeks ( DateTime time, int weeks ) : DateTime | ||
| time | DateTime | |
| weeks | int | |
| return | DateTime | |
/// <summary>
/// 根据一年中的第几周获取该周的开始日期与结束日期
/// </summary>
/// <param name="year"></param>
/// <param name="weekNumber"></param>
/// <param name="culture"></param>
/// <returns></returns>
public static Tuple <DateTime, DateTime> GetFirstEndDayOfWeek(int year, int weekNumber, System.Globalization.CultureInfo culture)
{
System.Globalization.Calendar calendar = culture.Calendar;
DateTime firstOfYear = new DateTime(year, 1, 1, calendar);
DateTime targetDay = calendar.AddWeeks(firstOfYear, weekNumber - 1);
DayOfWeek firstDayOfWeek = culture.DateTimeFormat.FirstDayOfWeek;
while (targetDay.DayOfWeek != firstDayOfWeek)
{
targetDay = targetDay.AddDays(-1);
}
return(Tuple.Create <DateTime, DateTime>(targetDay, targetDay.AddDays(6)));
}
public static WeekAndDate GetFirstEndDayOfWeekStr(int weekNumber, System.Globalization.CultureInfo culture)
{
System.Globalization.Calendar calendar = culture.Calendar;
DateTime firstOfYear = new DateTime(DateTime.Now.Year, 1, 1, calendar);
var index = (int)firstOfYear.DayOfWeek;
DateTime targetDay = calendar.AddWeeks(firstOfYear, weekNumber - 1);
if (index > 1)
{
index = index - 1;
targetDay = targetDay.AddDays(-index);
}
//DayOfWeek firstDayOfWeek = culture.DateTimeFormat.FirstDayOfWeek;
//while (targetDay.DayOfWeek != firstDayOfWeek)
//{
// targetDay = targetDay.AddDays(-1);
//}
string str = targetDay.ToShortDateString() + "~" + targetDay.AddDays(6).ToShortDateString();
WeekAndDate wad = new WeekAndDate();
wad.Week = weekNumber;
wad.BTEDate = str;
wad.DateList = new List <DateTime>();
wad.DateList.Add(targetDay);
wad.DateList.Add(targetDay.AddDays(1));
wad.DateList.Add(targetDay.AddDays(2));
wad.DateList.Add(targetDay.AddDays(3));
wad.DateList.Add(targetDay.AddDays(4));
return(wad);
}
private static IEnumerable<DateTime> GetOccurrences(DateInterval interval, DatePeriod period, Calendar calendar, DateTime start, DateTime end, bool skipWeekends = true)
{
var difference = DateSpan.GetDifference(interval, start, end)/period.Quantifier;
if (start.Kind == DateTimeKind.Utc)
{
start = start.ToLocalTime();
}
for (var i = 0; i < difference; i++)
{
switch (period.Frequency)
{
case DatePeriodFrequency.Seconds:
var seconds = calendar.AddSeconds(start, period.Quantifier * i);
yield return DeferOccurrenceFallingOnWeekend(calendar, seconds, skipWeekends);
break;
case DatePeriodFrequency.Minutes:
var minutes = calendar.AddMinutes(start, period.Quantifier * i);
yield return DeferOccurrenceFallingOnWeekend(calendar, minutes, skipWeekends);
break;
case DatePeriodFrequency.Hours:
var hours = calendar.AddHours(start, period.Quantifier * i);
yield return DeferOccurrenceFallingOnWeekend(calendar, hours, skipWeekends);
break;
case DatePeriodFrequency.Days:
var days = calendar.AddDays(start, period.Quantifier*i);
yield return DeferOccurrenceFallingOnWeekend(calendar, days, skipWeekends);
break;
case DatePeriodFrequency.Weeks:
var weeks = calendar.AddWeeks(start, period.Quantifier*i);
yield return DeferOccurrenceFallingOnWeekend(calendar, weeks, skipWeekends);
break;
case DatePeriodFrequency.Months:
var months = calendar.AddMonths(start, period.Quantifier*i);
yield return DeferOccurrenceFallingOnWeekend(calendar, months, skipWeekends);
break;
case DatePeriodFrequency.Years:
var years = calendar.AddYears(start, period.Quantifier*i);
yield return DeferOccurrenceFallingOnWeekend(calendar, years, skipWeekends);
break;
default:
throw new ArgumentException("Frequency");
}
}
}
/// <summary>
/// Gets the first day of a week.
/// </summary>
/// <param name="year">The year.</param>
/// <param name="week">The week.</param>
/// <param name="calendar">The calendar.</param>
/// <param name="calendarWeekRule">The calendar week rule.</param>
/// <param name="firstDayOfWeek">The first day of week.</param>
/// <returns>The date of the first day in the week.</returns>
public static DateTime GetFirstDayOfWeek(
int year,
int week,
Calendar calendar = null,
CalendarWeekRule calendarWeekRule = CalendarWeekRule.FirstFourDayWeek,
DayOfWeek firstDayOfWeek = DayOfWeek.Sunday)
{
if (calendar == null)
calendar = CultureInfo.CurrentCulture.Calendar;
DateTime firstDay = new DateTime(year, 1, 7, calendar);
while (calendar.GetDayOfWeek(firstDay) != firstDayOfWeek || WeekNumber(firstDay, calendar, calendarWeekRule, firstDayOfWeek) % 52 > 1)
{
firstDay = calendar.AddDays(firstDay, -1);
}
// Add the week
return (week != 1) ? calendar.AddWeeks(firstDay, week - 1) : firstDay;
}
