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public static class dateTimeDiff
{
??? /// <summary>
??? /// 計算日期間隔
??? /// </summary>
??? /// <param name="d1">要參與計算的其中一個日期字符串</param>
??? /// <param name="d2">要參與計算的另一個日期字符串</param>
??? /// <returns>一個表示日期間隔的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("字符串參數不正確!");
??????? }
??? }
??? /// <summary>
??? /// 計算日期間隔
??? /// </summary>
??? /// <param name="d1">要參與計算的其中一個日期</param>
??? /// <param name="d2">要參與計算的另一個日期</param>
??? /// <returns>一個表示日期間隔的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;
??? }

??? /// <summary>
??? /// 計算日期間隔
??? /// </summary>
??? /// <param name="d1">要參與計算的其中一個日期字符串</param>
??? /// <param name="d2">要參與計算的另一個日期字符串</param>
??? /// <param name="drf">決定返回值形式的枚舉</param>
??? /// <returns>一個代表年月日的int數組，具體數組長度與枚舉參數drf有關</returns>
??? public static int[] toResult(string d1, string d2, diffFormat drf)
??? {
??????? try
??????? {
??????????? DateTime date1 = DateTime.Parse(d1);
??????????? DateTime date2 = DateTime.Parse(d2);
??????????? return toResult(date1, date2, drf);
??????? }
??????? catch
??????? {
??????????? throw new Exception("字符串參數不正確!");
??????? }
??? }
??? /// <summary>
??? /// 計算日期間隔
??? /// </summary>
??? /// <param name="d1">要參與計算的其中一個日期</param>
??? /// <param name="d2">要參與計算的另一個日期</param>
??? /// <param name="drf">決定返回值形式的枚舉</param>
??? /// <returns>一個代表年月日的int數組，具體數組長度與枚舉參數drf有關</returns>
??? public static int[] toResult(DateTime d1, DateTime d2, diffFormat drf)
??? {
??????? #region 數據初始化
??????? 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 按條件計算
??????? if (drf == diffFormat.Day)
??????? {
??????????? TimeSpan ts = max - min;
??????????? return new int[] { ts.Days };
??????? }
??????? if (drf == diffFormat.Month)
??????? {
??????????? return new int[] { month + year * 12 };
??????? }
??????? if (drf == diffFormat.Year)
??????? {
??????????? return new int[] { year };
??????? }
??????? return new int[] { year, month };
??????? #endregion
??? }
}
/// <summary>
/// 關于返回值形式的枚舉
/// </summary>
public enum diffFormat
{
??? /// <summary>
??? /// 年數和月數
??? /// </summary>
??? YearMonth,
??? /// <summary>
??? /// 年數
??? /// </summary>
??? Year,
??? /// <summary>
??? /// 月數
??? /// </summary>
??? Month,
??? /// <summary>
??? /// 天數
??? /// </summary>
??? Day,
}

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例：
??????????????? DateTime dt1 = DateTime.Parse(dt.Rows[0]["mtime"].ToString());
??????????????? DateTime dt2 = DateTime.Parse(dt.Rows[count - 1]["mtime"].ToString());

??????????????? int[] kk = dateTimeDiff.toResult(dt1, dt2, diffFormat.Month);

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本文轉自94cool博客園博客，原文鏈接：http://www.cnblogs.com/94cool/archive/2011/06/13/2079795.html，如需轉載請自行聯系原作者

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