/// <summary>
/// 取得指定月份週數。
/// </summary>
/// <param name="year">年份。</param>
/// <param name="month">月份。</param>
public static int WeeksInMonth(int year, int month)
{
DateTime oDate;
int iDays;
// 取得該月最後一天，並判斷日期為該月的第幾週
iDays = DateFunc.DaysInMonth(year, month);
oDate = new DateTime(year, month, iDays);
return(GetWeekOfYear(oDate));
}
/// <summary>
/// 以指定日期為基準，取得指定範圍的日期區間。
/// </summary>
/// <param name="value">指定日期。</param>
/// <param name="unit">日期單位。</param>
/// <param name="startDate">傳出起始日期。</param>
/// <param name="endDate">傳出終止日期。</param>
public static void GetDateRange(DateTime value, EDateUnit unit, out DateTime startDate, out DateTime endDate)
{
int iWeekday;
int iDaysOfMonth;
startDate = DateTime.MinValue;
endDate = DateTime.MinValue;
switch (unit)
{
case EDateUnit.Day:
startDate = value;
endDate = value;
break;
case EDateUnit.Week:
iWeekday = Weekday(value);
startDate = value.AddDays(iWeekday * -1); //取得該週的第一天
endDate = value.AddDays(7 - iWeekday); //取得該週的最後一天
break;
case EDateUnit.Month:
iDaysOfMonth = DateFunc.DaysInMonth(value);
startDate = new DateTime(value.Year, value.Month, 1); //取得該月的第一天
endDate = new DateTime(value.Year, value.Month, iDaysOfMonth); //取得該月的最後一天
break;
case EDateUnit.Quarter:
GetQuarterRange(value, out startDate, out endDate);
break;
case EDateUnit.Year:
startDate = new DateTime(value.Year, 1, 1); //取得該年度的第一天
endDate = new DateTime(value.Year, 12, 31); //取得該年度的最後一天
break;
}
}
