| public abstract AddYears ( DateTime time, int years ) : DateTime | ||
| time | DateTime | |
| years | int | |
| return | DateTime | |
internal void UpdateDecadeMode()
{
DateTime selectedYear;
if (Owner != null)
{
selectedYear = Owner.DisplayYear;
}
else
{
selectedYear = DateTime.Today;
}
DateTime decade = GetDecadeForDecadeMode(selectedYear);
DateTime decadeEnd = _calendar.AddYears(decade, 9);
SetDecadeModeHeaderButton(decade);
SetDecadeModePreviousButton(decade);
SetDecadeModeNextButton(decadeEnd);
if (_yearView != null)
{
SetYearButtons(decade, decadeEnd);
}
}
public static DateTime?AddYears(DateTime time, int years)
{
try
{
return(cal.AddYears(time, years));
}
catch (System.ArgumentException)
{
return(null);
}
}
public virtual DateTime GetToDate(DateTime dt, System.Globalization.Calendar calendar)
{
if (this.Order == 1 && this.FromMonth > this.ToMonth)
{
if (calendar.GetMonth(dt) == 12)
{
//در اولین بازه محدوده، ماه شروع در سال قبل قرار گرفته
dt = calendar.AddYears(dt, 1);
}
}
if (this.Order == 12 && this.FromMonth > this.ToMonth)
{
if (calendar.GetMonth(dt) == 12)
{
//در آخرین بازه محدوده، ماه پایان در سال بعد قرار گرفته
dt = calendar.AddYears(dt, 1);
}
}
else if (this.Order == 0 && this.FromMonth >= this.ToMonth)
{
//بازه سالانه است و پایان در سال بعد قرار گرفته
dt = calendar.AddYears(dt, 1);
}
if (calendar is PersianCalendar)
{
if (calendar.IsLeapYear(calendar.GetYear(dt)) && this.ToMonth == 12 && this.ToDay == 29)
{
return(calendar.ToDateTime(calendar.GetYear(dt), this.ToMonth, 30, 0, 0, 0, 0));
}
else
{
return(calendar.ToDateTime(calendar.GetYear(dt), this.ToMonth, this.ToDay, 0, 0, 0, 0));
}
}
else
{
if (calendar.IsLeapYear(dt.Year) && this.ToMonth == 2 && this.ToDay == 28)
{
//اگر سال کبسه بود و برای ماه فوریه روز 28 انتخاب شده بود
//به صورت خودکار با روز 29 جایگزین می شود
return(calendar.ToDateTime(dt.Year, this.ToMonth, 29, 0, 0, 0, 0));
}
else
{
return(calendar.ToDateTime(dt.Year, this.ToMonth, this.ToDay, 0, 0, 0, 0));
}
}
}
public virtual DateTime GetFromDate(DateTime dt, System.Globalization.Calendar calendar)
{
if (this.Order == 1 && this.FromMonth > this.ToMonth)
{
if (calendar.GetMonth(dt) == 1)
{
//در اولین بازه محدوده، ماه شروع در سال قبل قرار گرفته
dt = calendar.AddYears(dt, -1);
}
}
else if (this.Order == 0 && this.FromMonth >= this.ToMonth)
{
//بازه سالانه است و شروع در سال قبل قرار گرفته
dt = calendar.AddYears(dt, -1);
}
return(calendar.ToDateTime(calendar.GetYear(dt), this.FromMonth, this.FromDay, 0, 0, 0, 0));
}
public static DateTime?AddYears(DateTime time, int years)
{
try
{
return(Cal.AddYears(time, years));
}
catch (ArgumentException)
{
return(new DateTime?());
}
}
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");
}
}
}
public static DateTime EndOfYear( this DateTime date, Calendar calendar )
{
Arg.NotNull( calendar, nameof( calendar ) );
Contract.Ensures( calendar.GetYear( Contract.Result<DateTime>() ) == Contract.OldValue( calendar.GetYear( date ) ) );
return calendar.AddYears( date.StartOfYear( calendar ), 1 ).AddTicks( -1L );
}