在C#内使用的DateDiff函数

using System; namespace ReflectionIT.System { public enum DateInterval { Year, Month, Weekday, Day, Hour, Minute, Second } public class DateTimeUtil { public static long DateDiff(DateInterval interval, DateTime date1, DateTime date2) { TimeSpan ts = date2 - date1; switch (interval) { case DateInterval.Year: return date2.Year - date1.Year; case DateInterval.Month: return (date2.Month - date1.Month) + (12 * (date2.Year - date1.Year)); case DateInterval.Weekday: return Fix(ts.TotalDays) / 7; case DateInterval.Day: return Fix(ts.TotalDays); case DateInterval.Hour: return Fix(ts.TotalHours); case DateInterval.Minute: return Fix(ts.TotalMinutes); default: return Fix(ts.TotalSeconds); } } private static long Fix(double Number) { if (Number >= 0) { return (long)Math.Floor(Number); } return (long)Math.Ceiling(Number); } } }