Asp.net 时间操作基类(支持短日期,长日期,时间差)

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 ec
{
/// <summary>
/// 时间操作函数
/// </summary>
public class timeobject
{
/// <summary>
/// 时间差
/// </summary>
/// <param name="starttime">开始时间</param>
/// <param name="endtime">结束时间</param>
/// <returns></returns>
public static string gettimespan(datetime starttime, datetime endtime)
{
timespan ts = endtime - starttime;
return string.format("{0}时{1}分{2}秒{3}毫秒", ts.hours, ts.minutes, ts.seconds, ts.milliseconds);
}
/// <summary>
/// 转称为月-日:09-12
/// </summary>
/// <param name="d">日期</param>
/// <returns></returns>
public static string todatemonthday(datetime d)
{
return d.tostring("mm-dd");
}
/// <summary>
/// 转换为年月日:2006-09-12
/// </summary>
/// <param name="d"></param>
/// <returns></returns>
public static string todatestring(datetime d)
{
return d.tostring("yyyy-mm-dd");
}
/// <summary>
/// 转换为:小时:分:秒 00:29:58
/// </summary>
/// <param name="t"></param>
/// <returns></returns>
public static string totimestring(datetime t)
{
return t.tostring("hh:mm:ss");
}
/// <summary>
/// 转换为长时间:2006-09-12 00:30:57
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string todatetimestring(datetime dt)
{
return dt.tostring("yyyy-mm-dd hh:mm:ss");
}
}
}