时间转换：DateTimeExtensions-创新互联

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Beehive.CloudReader.Utility
{
public static class DateTimeExtensions
    {
///    /// 
   /// 
   ///    ///    public static string ToRelativeDateTimeT(this DateTime dateTime)
        {
var time = DateTime.Now - dateTime;

//如果不在同一年 则直接显示年月日 if ((int.Parse(dateTime.ToString("yyyy")) - int.Parse(DateTime.Now.ToString("yyyy"))) != 0) // if (time.TotalDays > 365)  return dateTime.ToString("yyyy-MM-dd");
if (time.TotalDays > 2)
return dateTime.ToString("M月d日 HH:mm");
else
            {
var day = DateTime.Now.Date - dateTime.Date;
if (day.Days == 2)
return string.Format("前天{0:HH:mm}", dateTime);
if (day.Days == 1)
return string.Format("昨天{0:HH:mm}", dateTime);
if (time.TotalMinutes > 60)
return string.Format("今天{0:HH:mm}", dateTime);
if (time.TotalSeconds > 60)
return string.Format("{0}分钟前", time.Minutes);
if (time.TotalSeconds < 60 && time.TotalDays >= 0)
return "刚刚";
else
                {
if (time.Days == 0 && dateTime.Date == DateTime.Now.Date)
return string.Format("今天{0:HH:mm}", dateTime);
if (time.TotalDays >= -1)
return string.Format("明天{0:HH:mm}", dateTime);
if (time.TotalDays < -1 && time.TotalDays > -2)
return string.Format("后天{0:HH:mm}", dateTime);
return dateTime.ToString("M月d日 HH:mm");
                }
            }
        }


public static string ToRelativeDateTimeDay(this DateTime dateTime)
        {
var time = DateTime.Now - dateTime;

//如果不在同一年 则直接显示年月日 if ((int.Parse(dateTime.ToString("yyyy")) - int.Parse(DateTime.Now.ToString("yyyy"))) != 0) // if (time.TotalDays > 365)  return dateTime.ToString("yyyy-MM-dd");
if (time.TotalDays > 2)
return dateTime.ToString("M月d日");
else
            {
var day = DateTime.Now.Date - dateTime.Date;
if (day.Days == 2)
return string.Format("前天", dateTime);
if (day.Days == 1)
return string.Format("昨天", dateTime);
if (time.TotalMinutes > 60)
return string.Format("{0:HH:mm}", dateTime);
if (time.TotalSeconds > 60)
return string.Format("{0}分钟前", time.Minutes);
if (time.TotalSeconds < 60 && time.TotalDays >= 0)
return "刚刚";
else
                {
if (time.Days == 0 && dateTime.Date == DateTime.Now.Date)
return string.Format("{0:HH:mm}", dateTime);
if (time.TotalDays >= -1)
return string.Format("明天", dateTime);
if (time.TotalDays < -1 && time.TotalDays > -2)
return string.Format("后天", dateTime);
return dateTime.ToString("M月d日");
                }
            }
        }

///    /// 
   /// 
   ///    ///    public static long ToTimeStamp(this DateTime dateTime)
        {
var stamp = dateTime.Ticks - new DateTime(1970, 1, 1).Ticks;
return stamp / 10000000 - 8 * 60 * 60;
        }


public static string ToWelcome(this DateTime dateTime)
        {
var hour = DateTime.Now.Hour;
var msg = "";
if (hour >= 6 && hour < 8)
            {
                msg= "早上好";
            }
else if (hour >= 8 && hour < 11)
            {
                msg= "上午好";
            }
else if (hour >= 11 && hour < 13)
            {
                msg= "中午好";
            }
else if (hour >= 13 && hour < 18)
            {
                msg= "下午好";
            }
else
            {
                msg= "晚上好";
            }
return msg;
        }
    }
}

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时间转换：DateTimeExtensions-创新互联

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