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/// <summary>
/// 判断两个日期之间的相差数
/// </summary>
/// <param name="howtocompare">要比较的类型,可选参数:year,month,day,hour,minute,second</param>
/// <param name="startDate">开始日期</param>
/// <param name="endDate">结束日期</param>
/// <returns>返回double型数</returns>
public static double DateDiff(string howtocompare, System.DateTime startDate, System.DateTime endDate)
{
double diff = 0;
System.TimeSpan TS = new System.TimeSpan(endDate.Ticks - startDate.Ticks);
switch (howtocompare.ToLower())
{
case "year":
diff = Convert.ToDouble(TS.TotalDays / 365);
break;
case "month":
diff = Convert.ToDouble((TS.TotalDays / 365) * 12);
break;
case "day":
diff = Convert.ToDouble(TS.TotalDays);
break;
case "hour":
diff = Convert.ToDouble(TS.TotalHours);
break;
case "minute":
diff = Convert.ToDouble(TS.TotalMinutes);
break;
case "second":
diff = Convert.ToDouble(TS.TotalSeconds);
break;
}
return diff;
}