/// <summary>
/// 計(jì)算日期的間隔(靜態(tài)類)
/// </summary>
public static class dateTimeDiff
{
#region 計(jì)算日期間隔
/// <summary>
/// 計(jì)算日期間隔
/// </summary>
/// <param name="d1">要參與計(jì)算的其中一個(gè)日期字符串</param>
/// <param name="d2">要參與計(jì)算的另一個(gè)日期字符串</param>
/// <returns>一個(gè)表示日期間隔的TimeSpan類型</returns>
public static TimeSpan toResult(string d1, string d2)
{
try
{
DateTime date1 = DateTime.Parse(d1);
DateTime date2 = DateTime.Parse(d2);
return toResult(date1, date2);
}
catch
{
throw new Exception("字符串參數(shù)不正確!");
}
}
#endregion

#region 計(jì)算日期間隔
/// <summary>
/// 計(jì)算日期間隔
/// </summary>
/// <param name="d1">要參與計(jì)算的其中一個(gè)日期</param>
/// <param name="d2">要參與計(jì)算的另一個(gè)日期</param>
/// <returns>一個(gè)表示日期間隔的TimeSpan類型</returns>
public static TimeSpan toResult(DateTime d1, DateTime d2)
{
TimeSpan ts;
if (d1 > d2)
{
ts = d1 - d2;
}
else
{
ts = d2 - d1;
}
return ts;
}
#endregion

#region 計(jì)算日期間隔
/// <summary>
/// 計(jì)算日期間隔
/// </summary>
/// <param name="d1">要參與計(jì)算的其中一個(gè)日期字符串</param>
/// <param name="d2">要參與計(jì)算的另一個(gè)日期字符串</param>
/// <param name="drf">決定返回值形式的枚舉</param>
/// <returns>一個(gè)代表年月日的int數(shù)組，具體數(shù)組長度與枚舉參數(shù)drf有關(guān)</returns>
public static int[] toResult(string d1, string d2, diffResultFormat drf)
{
try
{
DateTime date1 = DateTime.Parse(d1);
DateTime date2 = DateTime.Parse(d2);
return toResult(date1, date2, drf);
}
catch
{
throw new Exception("字符串參數(shù)不正確!");
}
}
#endregion

#region 計(jì)算日期間隔
/// <summary>
/// 計(jì)算日期間隔
/// </summary>
/// <param name="d1">要參與計(jì)算的其中一個(gè)日期</param>
/// <param name="d2">要參與計(jì)算的另一個(gè)日期</param>
/// <param name="drf">決定返回值形式的枚舉</param>
/// <returns>一個(gè)代表年月日的int數(shù)組，具體數(shù)組長度與枚舉參數(shù)drf有關(guān)</returns>
public static int[] toResult(DateTime d1, DateTime d2, diffResultFormat drf)
{
#region 數(shù)據(jù)初始化
DateTime max;
DateTime min;
int year;
int month;
int tempYear, tempMonth;
if (d1 > d2)
{
max = d1;
min = d2;
}
else
{
max = d2;
min = d1;
}
tempYear = max.Year;
tempMonth = max.Month;
if (max.Month < min.Month)
{
tempYear--;
tempMonth = tempMonth + 12;
}
year = tempYear - min.Year;
month = tempMonth - min.Month;
#endregion
#region 按條件計(jì)算
if (drf == diffResultFormat.dd)
{
TimeSpan ts = max - min;
return new int[] { ts.Days };
}
if (drf == diffResultFormat.mm)
{
return new int[] { month + year * 12 };
}
if (drf == diffResultFormat.yy)
{
return new int[] { year };
}
return new int[] { year, month };
#endregion
}
#endregion
}
#region 關(guān)于返回值形式的枚舉
/// <summary>
/// 關(guān)于返回值形式的枚舉
/// </summary>
public enum diffResultFormat
{
/// <summary>
/// 年數(shù)和月數(shù)
/// </summary>
yymm,
/// <summary>
/// 年數(shù)
/// </summary>
yy,
/// <summary>
/// 月數(shù)
/// </summary>
mm,
/// <summary>
/// 天數(shù)
/// </summary>
dd,
}
#endregion

DateTime sDate = Convert.ToDateTime("2014-1-16");
DateTime eDate = Convert.ToDateTime("2014-2-16");
int month = dateTimeDiff.toResult(sDate, eDate, diffResultFormat.mm)[0];