asp.net 日期比较代码

asp教程.net 日期比较代码
下面我们有二种方法对日期进行对比，并且算出两个日期之前的相差天数，与相差小时等。

//简单易懂日期比较

datetime startdate = datetime.parse("2010-7-21 00:00:00");
datetime enddate = datetime.parse("2010-7-22 00:00:00");
timespan ts = enddate.subtract(startdate);
double days = ts.totaldays;
double hours = ts.totalhours;

//完整的封装类

 public enum enumdatecompare
  {
  year = 1,
  month = 2,
  day = 3,
  hour = 4,
  minute = 5,
  second = 6
  }

  ///

  /// 日期比较函数
  ///

  ///
  /// www.111com.net
  ///
  ///
  public double datediff(enumdatecompare howtocompare, system.datetime startdate, system.datetime enddate)
  {
  double diff = 0;
  system.timespan ts = new system.timespan(enddate.ticks - startdate.ticks);

  switch (howtocompare)
  {
  case enumdatecompare.year:
  diff = convert.todouble(ts.totaldays / 365);
  break;
  case enumdatecompare.month:
  diff = convert.todouble((ts.totaldays / 365) * 12);
  break;
  case enumdatecompare.day:
  diff = convert.todouble(ts.totaldays);
  break;
  case enumdatecompare.hour:
  diff = convert.todouble(ts.totalhours);
  break;
  case enumdatecompare.minute:
  diff = convert.todouble(ts.totalminutes);
  break;
  case enumdatecompare.second:
  diff = convert.todouble(ts.totalseconds);
  break;
  }
  return diff;
  }
//封装一下用起来比较方便 如：
datediff(enumdatecompare.hour,starttime,stoptime)