datemanage.cs

用vs2005写的一个生产任务管理系统。数据的统计和综合查询是主要功能

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace DateManage
{
    /// <summary>
    /// DateManage 的摘要说明
    /// </summary>
    /// 
    public enum DateInterval
    {
        Second, Minute, Hour, Day, Week, Month, Quarter, Year
    }


    public  class DateTimeManger
    {
        public DateTimeManger()
        { 

        }
        public  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);
        }
    }
}