日期分割，做按时间统计时会用到代码,C#代码库,德仔网

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【C#】日期分割，做按时间统计时会用到
作者:东京 / 发布于2016/7/27/ 574
我们知道数据库里的datediff函数可以判断两个时间的时间差，在做统计时，常常会统计：今天的记录，本周的记录，本月的记录，三个月内的记录，本年度记录等等。如果想对时间段做的更为人性化或更精确，还是自己拆分时间段比较好。比如统计时间到当前时间。
using System;  
using System.Collections.Generic;  
using System.Globalization;  
  
namespace 日期分割  
{  
    class Program  
    {  
        static void Main()  
        {  
            Dictionary<string, string> timeRangeDic = new Dictionary<string, string>();  
            Console.WriteLine("==================[一天内时间段(到当前时间)分割]====================");  
            DateTime todayStart = DateTime.Parse(DateTime.Now.ToString("yyyy-MM-dd 00:00:00"));  
            for (int hour = 1; hour <= DateTime.Now.Hour; hour++)  
            {  
                string key = string.Format("{0}-{1}", todayStart.AddHours(hour - 1).ToString("HH时"),  
                                           todayStart.AddHours(hour).ToString("HH时"));  
                if (!timeRangeDic.ContainsKey(key))  
                {  
                    timeRangeDic.Add(key,  
                                     todayStart.AddHours(hour - 1).ToString("yyyy-MM-dd HH:00:00") + " 到 " +  
                                     todayStart.AddHours(hour).ToString("yyyy-MM-dd HH:00:00"));  
                }  
            }  
            foreach (KeyValuePair<string, string> pair in timeRangeDic)  
            {  
                Console.WriteLine(pair.Key + " " + pair.Value);  
            }  
            Console.WriteLine();  
            Console.WriteLine("==================[最近一周内(到当前时间)时间段分割]================");  
            timeRangeDic.Clear();  
            DateTime weekStart =  
                DateTime.Parse(DateTime.Now.ToString("yyyy-MM-dd 00:00:00")).AddDays(-(int)(DateTime.Now.DayOfWeek));  
            for (int day = 0; day < Convert.ToInt32(DateTime.Now.DayOfWeek); day++)  
            {  
                string key = string.Format("{0}-{1}", GetWeek(day), GetWeek(day + 1));  
                if (!timeRangeDic.ContainsKey(key))  
                {  
                    if (day == Convert.ToInt32(DateTime.Now.DayOfWeek) - 1)  
                    {  
                        timeRangeDic.Add(key,  
                                         weekStart.AddDays(day).ToString("yyyy-MM-dd HH:00:00") + " 到 " +  
                                        DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));//当前时间  
                    }  
                    else  
                    {  
                        timeRangeDic.Add(key,  
                                        weekStart.AddDays(day).ToString("yyyy-MM-dd HH:00:00") + " 到 " +  
                                        weekStart.AddDays(day + 1).ToString("yyyy-MM-dd HH:00:00"));  
                    }  
                }  
            }  
            foreach (KeyValuePair<string, string> pair in timeRangeDic)  
            {  
                Console.WriteLine(pair.Key + " " + pair.Value);  
            }  
  
            Console.WriteLine();  
            Console.WriteLine("==================[最近一月内(到当前时间)时间段分割]==============");  
            timeRangeDic.Clear();  
            DateTime monthStart = DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01 00:00:00"));  
            for (int day = 1; day < DateTime.Now.Date.Day; day++)  
            {  
                string key = string.Format("{0}日-{1}日", day.ToString(CultureInfo.InvariantCulture).PadLeft(2, '0'),  
                                           (day + 1).ToString(CultureInfo.InvariantCulture).PadLeft(2, '0'));  
                if (!timeRangeDic.ContainsKey(key))  
                {  
                    if (day == DateTime.Now.Date.Day - 1)  
                    {  
                        timeRangeDic.Add(key,  
                                         monthStart.AddDays(day - 1).ToString("yyyy-MM-dd HH:00:00") + " 到 " +  
                                         DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));  
                    }  
                    else  
                    {  
  
                        timeRangeDic.Add(key,  
                                         monthStart.AddDays(day - 1).ToString("yyyy-MM-dd HH:00:00") + " 到 " +  
                                         monthStart.AddDays(day).ToString("yyyy-MM-dd HH:00:00"));  
                    }  
                }  
            }  
            foreach (KeyValuePair<string, string> pair in timeRangeDic)  
            {  
                Console.WriteLine(pair.Key + " " + pair.Value);  
            }  
  
            Console.WriteLine();  
            Console.WriteLine("==================[最近三个月内(到当前时间)时间段分割]==============");  
            timeRangeDic.Clear();  
            DateTime currMonthStart = DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01 00:00:00"));  
            for (int month = 2; month >= 0; month--)  
            {  
                string key = string.Format("{0}-{1}",  
                                        currMonthStart.AddMonths(-month - 1).ToString("yyyy年MM月"),  
                                        currMonthStart.AddMonths(-month).ToString("yyyy年MM月"));  
                if (!timeRangeDic.ContainsKey(key))  
                {  
                    if (month == 0)  
                    {  
                        timeRangeDic.Add(key,  
                                         currMonthStart.AddMonths(-month - 1)  
                                                       .ToString("yyyy-MM-dd HH:00:00") +  
                                         " 到 " +  
                                         DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));//当前时间  
                    }  
                    else  
                    {  
                        timeRangeDic.Add(key,  
                                         currMonthStart.AddMonths(-month - 1)  
                                                       .ToString("yyyy-MM-dd HH:00:00") +  
                                         " 到 " +  
                                         currMonthStart.AddMonths(-month).ToString("yyyy-MM-dd HH:00:00"));  
                    }  
                }  
            }  
            foreach (KeyValuePair<string, string> pair in timeRangeDic)  
            {  
                Console.WriteLine(pair.Key + " " + pair.Value);  
            }  
  
            Console.WriteLine();  
            Console.WriteLine("==================[本年内(到当前时间)时间段分割]===================");  
            timeRangeDic.Clear();  
            DateTime yearStart = DateTime.Parse(DateTime.Now.ToString("yyyy-01-01 00:00:00"));  
            for (int month = 1; month < DateTime.Now.Date.Month; month++)  
            {  
                string key = string.Format("{0}月-{1}月",  
                                           month.ToString(CultureInfo.InvariantCulture).PadLeft(2, '0'),  
                                           (month + 1).ToString(CultureInfo.InvariantCulture).PadLeft(2, '0'));  
                if (!timeRangeDic.ContainsKey(key))  
                {  
                    if (month == DateTime.Now.Date.Month - 1)  
                    {  
                        timeRangeDic.Add(key,  
                                           yearStart.AddMonths(month - 1).ToString("yyyy-MM-dd HH:00:00") +  
                                           " 到 " +  
                                          DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));  
                    }  
                    else  
                    {  
                        timeRangeDic.Add(key,  
                                         yearStart.AddMonths(month - 1).ToString("yyyy-MM-dd HH:00:00") +  
                                         " 到 " +  
                                         yearStart.AddMonths(month).ToString("yyyy-MM-dd HH:00:00"));  
                    }  
                }  
            }  
            foreach (KeyValuePair<string, string> pair in timeRangeDic)  
            {  
                Console.WriteLine(pair.Key + " " + pair.Value);  
            }  
  
  
            Console.Read();  
        }  
        public static string GetWeek(int current)  
        {  
            string[] weekdays = { "周日", "周一", "周二", "周三", "周四", "周五", "周六" };  
            string week = current < weekdays.Length ? weekdays[current] : "";  
            return week;  
        }  
    }  
}
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