在SQL 中有Datediff函數﹐在需要進行時間方面的計算機時很好使﹐可在C#中卻沒有這種函數﹐一個偶然的機會﹐在網上找到如下類。轉貼在這里。以供日后使用.
public enum DateInterval
{
Second, Minute, Hour, Day, Week, Month, Quarter, Year
}
public sealed class DateTimeManger
{
private DateTimeManger()
{}//end of default constructor
public static long DateDiff(DateInterval Interval, System.DateTime StartDate, System.DateTime EndDate )
{
long lngDateDiffValue = 0;
System.TimeSpan TS = new System.TimeSpan(EndDate.Ticks - StartDate.Ticks);
switch (Interval)
{
case DateInterval.Second:
lngDateDiffValue = (long) TS.TotalSeconds;
break;
case DateInterval.Minute:
lngDateDiffValue = (long) TS.TotalMinutes;
break;
case DateInterval.Hour:
lngDateDiffValue = (long)TS.TotalHours;
break;
case DateInterval.Day:
lngDateDiffValue = (long) TS.Days;
break;
case DateInterval.Week:
lngDateDiffValue = (long)( TS.Days / 7);
break;
case DateInterval.Month:
lngDateDiffValue = (long)( TS.Days / 30);
break;
case DateInterval.Quarter:
lngDateDiffValue = (long)( (TS.Days / 30) / 3 );
break;
case DateInterval.Year:
lngDateDiffValue = (long)( TS.Days / 365);
break;
}
return (lngDateDiffValue);
}//end of DateDiff
}//end of class
Samples:
public class DateDiffCS
{
public static void Main (string[] CmdLineArgs)
{
System.DateTime date1 = System.DateTime.Now;
System.DateTime date2 = System.DateTime.Now.AddYears(2);
System.Console.Out.WriteLine("Days : " + DateTimeManger.DateDiff
(DateTimeManger.DateInterval.Day,date1,date2).ToString());
System.Console.Out.WriteLine("Hours : " + DateTimeManger.DateDiff
(DateTimeManger.DateInterval.Hour,date1,date2).ToString());
System.Console.Out.WriteLine("Minutes : " + DateTimeManger.DateDiff
(DateTimeManger.DateInterval.Minute,date1,date2).ToString());
System.Console.Out.WriteLine("Month : " + DateTimeManger.DateDiff
(DateTimeManger.DateInterval.Month,date1,date2).ToString());
System.Console.Out.WriteLine("Quarter : " + DateTimeManger.DateDiff
(DateTimeManger.DateInterval.Quarter,date1,date2).ToString());
System.Console.Out.WriteLine("Seconds : " + DateTimeManger.DateDiff
(DateTimeManger.DateInterval.Second,date1,date2).ToString());
System.Console.Out.WriteLine("Week : " + DateTimeManger.DateDiff
(DateTimeManger.DateInterval.Week,date1,date2).ToString());
System.Console.Out.WriteLine("Year : " + DateTimeManger.DateDiff
(DateTimeManger.DateInterval.Year,date1,date2).ToString());
System.Console.In.ReadLine();
}
}//end of the class
From:
HP.Mahesh.UtilityManager.Libraries.DateTimeUtility