using System;
using System.Collections.Generic;
using System.Text;

namespace Core.StlMes.Client.Sale.SaleFundMgt.Util
{
   public class DateTimeUtil
    {
       private static string _dateTimeDefaultFormat = "yyyyMMddHHmmss";

       /// <summary>
       /// 获取当前系统时间，并按默认格式yyyyMMddhhmmss 返回
       /// </summary>
       /// <returns></returns>
       public  static string GetSystemDate()
       {
           return GetSystemDate(_dateTimeDefaultFormat);
       }

       public static string GetSystemDate(string timeFormat)
       {
           return System.DateTime.Now.ToString(timeFormat);
       }

       private static TimeSpan GetTimeSpan(DateTime dtFrom, DateTime dtTo)
       {

           TimeSpan ts1 = new TimeSpan(dtFrom.Ticks);
           TimeSpan ts2 = new TimeSpan(dtTo.Ticks);
           TimeSpan ts = ts1.Subtract(ts2).Duration();
           return ts;
       }

       /// <summary>
       /// 获取二个世界差，到秒
       /// </summary>
       /// <param name="dtFrom"></param>
       /// <param name="dtTo"></param>
       /// <returns></returns>
       public static double GetDataTimeDiffBySeconds(DateTime dtFrom, DateTime dtTo)
       {
           return GetTimeSpan(dtFrom, dtTo).TotalSeconds;
       }

       /// <summary>
       /// 获取2个时间差，分
       /// </summary>
       /// <param name="dtFrom"></param>
       /// <param name="dtTo"></param>
       /// <returns></returns>
       public static double GetDataTimeDiffByMinutes(DateTime dtFrom, DateTime dtTo)
       {
           return GetTimeSpan(dtFrom, dtTo).TotalMinutes;
       }

       /// <summary>
       /// 获取2个时间差，天
       /// </summary>
       /// <param name="dtFrom"></param>
       /// <param name="dtTo"></param>
       /// <returns></returns>
       public static double GetDataTimeDiffByDays(DateTime dtFrom, DateTime dtTo)
       {
           return GetTimeSpan(dtFrom, dtTo).TotalDays;
       }

       /// <summary>
       /// 获取2个时间差，月
       /// </summary>
       /// <param name="dtFrom"></param>
       /// <param name="dtTo"></param>
       /// <returns></returns>
       public static int DateTimeDiffByMonths(DateTime dtFrom, DateTime dtTo)
       {
           try
           {
               int yearFrom = dtFrom.Year;
               int yearTo = dtTo.Year;
               int monthFrom = dtFrom.Month;
               int monthTo = dtTo.Month;
               int months = Math.Abs(12 * (yearTo - yearFrom) + (monthTo - monthFrom));
               return months;
           }
           catch
           {
           }
           return 0;
       }

    }
}