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8 changes: 5 additions & 3 deletions TimePeriod/TimeTool.cs
Original file line number Diff line number Diff line change
Expand Up @@ -349,7 +349,9 @@ public static DateTime GetStartOfYearWeek( int year, int weekOfYear, CultureInfo
int currentYear;
int currentWeek;
GetWeekOfYear( dateTime, culture, weekRule, firstDayOfWeek, yearWeekType, out currentYear, out currentWeek );


// get last week day of the week
DayOfWeek lastDayOfWeek = (DayOfWeek)(((int)firstDayOfWeek + TimeSpec.DaysPerWeek - 1) % TimeSpec.DaysPerWeek);

// end date of week
while ( currentWeek != weekOfYear )
Expand All @@ -358,8 +360,8 @@ public static DateTime GetStartOfYearWeek( int year, int weekOfYear, CultureInfo
GetWeekOfYear( dateTime, culture, weekRule, firstDayOfWeek, yearWeekType, out currentYear, out currentWeek );
}

// end of previous week
while ( currentWeek == weekOfYear )
// end of previous week => keep on going until got last week day
while (currentWeek == weekOfYear || dateTime.DayOfWeek != lastDayOfWeek)
{
dateTime = dateTime.AddDays( -1 );
GetWeekOfYear( dateTime, culture, weekRule, firstDayOfWeek, yearWeekType, out currentYear, out currentWeek );
Expand Down