一個C#時間工具類，可用於時間計算，比如根據出生年月實現生日提醒、兩個日期天數比較、根據英文的星期幾返回中文的星期幾、計算兩個時間的差值,返回的是x天x小時x分鐘x秒、時間相差值、根據時間返回幾個月前,幾天前,幾小時前,幾分鐘前以及幾秒前，現在用不到的話，先收藏吧，代碼如下：
001using System;
002using System.Collections.Generic;
003using System.Linq;
004using System.Text;
005namespace CLB.Utility.CharTools
006{
007 public static class DateTimeHelper
008 {
009 ////
010 /// 根據時間返回幾個月前,幾天前,幾小時前,幾分鐘前以及幾秒前
011 ///
012 ///
013 ///
014 public static string DateStringFromNow(DateTime dt)
015 {
016 TimeSpan span = DateTime.Now - dt;
017 if (span.TotalDays > 60)
018 {
019 return dt.ToShortDateString();
020 }
021 else if (span.TotalDays > 30)
022 {
023 return "1個月前";
024 }
025 else if (span.TotalDays > 14)
026 {
027 return "2周前";
028 }
029 else if (span.TotalDays > 7)
030 {
031 return "1周前";
032 }
033 else if (span.TotalDays > 1)
034 {
035 return string.Format("{0}天前", (int)Math.Floor(span.TotalDays));
036 }
037 else if (span.TotalHours > 1)
038 {
039 return string.Format("{0}小時前", (int)Math.Floor(span.TotalHours));
040 }
041 else if (span.TotalMinutes > 1)
042 {
043 return string.Format("{0}分鐘前", (int)Math.Floor(span.TotalMinutes));
044 }
045 else if (span.TotalSeconds >= 1)
046 {
047 return string.Format("{0}秒前", (int)Math.Floor(span.TotalSeconds));
048 }
049 else
050 {
051 return "1秒前";
052 }
053 }
054 ///
055 /// 時間相差值,返回時間差
056 /// 調用時,isTotal為true時,返回的時帶小數的天數,否則返回的是整數
057 ///
058 ///
059 ///
060 ///
061 ///
062 public static string DateDiff(DateTime DateTime1, DateTime DateTime2, bool isTotal)
063 {
064 TimeSpan ts = DateTime2 - DateTime1;
065 if (isTotal)
066 //帶小數的天數，比如1天12小時結果就是1.5
067 return ts.TotalDays.ToString();
068 else
069 //整數天數，1天12小時或者1天20小時結果都是1
070 return ts.Days.ToString();
071 }
072 ///
073 /// 計算兩個時間的差值,返回的是x天x小時x分鐘x秒
074 ///
075 ///
076 ///
077 ///
078 public static string DateDiff(DateTime DateTime1, DateTime DateTime2)
079 {
080 string dateDiff = null;
081 TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
082 TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
083 TimeSpan ts = ts1.Subtract(ts2).Duration();
084 //TimeSpan ts=ts1.Add(ts2).Duration();
085 dateDiff = ts.Days.ToString() + "天" + ts.Hours.ToString() + "小時" + ts.Minutes.ToString() + "分鐘"+ ts.Seconds.ToString() + "秒";
086 return dateDiff;
087 }
088 ///
089 /// 根據英文的星期幾返回中文的星期幾
090 /// 如WhichDay("Sunday"),返回星期日
091 ///
092 ///
093 ///
094 public static string WhichDay(string enWeek)
095 {
096 switch (enWeek.Trim())
097 {
098 case "Sunday":
099 return "星期日";
100 case "Monday":
101 return "星期一";
102 case "Tuesday":
103 return "星期二";
104 case "Wednesday":
105 return "星期三";
106 case "Thursday":
107 return "星期四";
108 case "Friday":
109 return "星期五";
110 case "Saturday":
111 return "星期六";
112 default:
113 return enWeek;
114 }
115 }
116 ///
117 /// 日期比較
118 ///
119 /// 當前日期
120 /// 輸入日期
121 /// 比較天數
122 /// 大於天數返回true，小於返回false
123 public static bool CompareDate(string today, string writeDate, int n)
124 {
125 DateTime Today = Convert.ToDateTime(today);
126 DateTime WriteDate = Convert.ToDateTime(writeDate);
127 WriteDate = WriteDate.AddDays(n);
128 if (Today >= WriteDate)
129 return false;
130 else
131 return true;
132 }
133 ///
134 /// 根據出生年月進行生日提醒
135 ///
136 ///
137 ///
138 public static string GetBirthdayTip(DateTime birthday)
139 {
140 DateTime now = DateTime.Now;
141 //TimeSpan span = DateTime.Now - birthday;
142 int nowMonth = now.Month;
143 int birtMonth = birthday.Month;
144 if (nowMonth == 12 && birtMonth == 1)
145 return string.Format("下月{0}號", birthday.Day);
146 if (nowMonth == 1 && birtMonth == 12)
147 return string.Format("上月{0}號", birthday.Day);
148 int months = now.Month - birthday.Month;
149 //int days = now.Day - birthday.Day;
150 if (months == 1)
151 return string.Format("上月{0}號", birthday.Day);
152 else if (months == -1)
153 return string.Format("下月{0}號", birthday.Day);
154 else if (months == 0)
155 {
156 if (now.Day == birthday.Day)
157 return "今天";
158 return string.Format("本月{0}號", birthday.Day);
159 }
160 else if (months > 1)
161 return string.Format("已過{0}月", months);
162 else
163 return string.Format("{0}月{1}日", birthday.Month, birthday.Day);
164 }
165 }
166}
