DateTimeHelper

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

namespace ZB.QueueSys.Common
{
    public class DateTimeHelper
    {
        //定义一个用于保存静态变量的实例
        private static DateTimeHelper instance = null;
        //定义一个保证线程同步的标识
        private static readonly object locker = new object();
        //构造函数为私有，使外界不能创建该类的实例
        private DateTimeHelper() { }
        public static DateTimeHelper Instance
        {
            get
            {
                if (instance == null)
                {
                    lock (locker)
                    {
                        if (instance == null) instance = new DateTimeHelper();
                    }
                }
                return instance;
            }
        }

        /// <summary>
        /// 计算两个时间之差，获取分钟数
        /// </summary>
        /// <param name="one">减数</param>
        /// <param name="two">被减数</param>
        /// <returns></returns>
        public double GetTotalMinutesByTime(DateTime one, DateTime two)
        {
            DateTime now = DateTime.Now;
            TimeSpan times = one.Subtract(now);
            double minutes = times.TotalMinutes;
            return minutes;
        }

        /// <summary>
        /// 计算当前时间 - 入参时间(获取分钟数；)
        /// </summary>
        /// <param name="time">被减数</param>
        /// <returns></returns>
        public double GetTotalMinutesByTime(DateTime time)
        {
            DateTime now = DateTime.Now;
            TimeSpan times = now.Subtract(time);
            double minutes = times.TotalMinutes;
            return minutes;
        }

        /// <summary>
        /// 根据日期返回 星期(返回结果为英文)
        /// </summary>
        /// <param name="date">日期</param>
        /// <returns>星期</returns>
        public string ConvertDateToENWeek(DateTime date)
        {
            DayOfWeek dt = new DateTime(date.Year, date.Month, date.Day).DayOfWeek;
            return dt.ToString();
        }

        /// <summary>
        /// 根据日期返回 星期(返回结果为中文)
        /// </summary>
        /// <param name="date">日期</param>
        /// <returns>星期</returns>
        public string ConvertDateToZHWeek(DateTime date)
        {
            string week = string.Empty;
            if (string.IsNullOrEmpty(date.ToString())) return week;
            DayOfWeek weekstr = new DateTime(date.Year, date.Month, date.Day).DayOfWeek;
            switch (weekstr.ToString())
            {
                case "Monday": week = "星期一"; break;
                case "Tuesday": week = "星期二"; break;
                case "Wednesday": week = "星期三"; break;
                case "Thursday": week = "星期四"; break;
                case "Friday": week = "星期五"; break;
                case "Saturday": week = "星期六"; break;
                case "Sunday": week = "星期天"; break;
            }
            return week;
        }

        /// <summary>  
        /// 得到本周第一天(星期一为第一天)  
        /// </summary>  
        /// <param name="date"></param>  
        /// <returns></returns>  
        public DateTime GetWeekFirstDay(DateTime date)
        {
            int weeknow = Convert.ToInt32(date.DayOfWeek);//得到结果是以周日为本周第一天
            weeknow = (weeknow == 0 ? (7 - 1) : (weeknow - 1));
            int daydiff = (-1) * weeknow;

            string FirstDay = date.AddDays(daydiff).ToString("yyyy-MM-dd") + " 00:00:00";
            return Convert.ToDateTime(FirstDay);
        }

        /// <summary>  
        /// 得到本周最后一天(以星期天为最后一天)  
        /// </summary>  
        /// <param name="datetime"></param>  
        /// <returns></returns>  
        public DateTime GetWeekLastDay(DateTime date)
        {
            int weeknow = Convert.ToInt32(date.DayOfWeek);//得到结果是以周日为本周第一天
            weeknow = (weeknow == 0 ? 7 : weeknow);
            int daydiff = (7 - weeknow);

            string LastDay = date.AddDays(daydiff).ToString("yyyy-MM-dd") + " 23:59:59";
            return Convert.ToDateTime(LastDay);
        }

        /// <summary> 
        /// 计算本周的周一日期 
        /// </summary> 
        /// <returns></returns> 
        public DateTime GetMondayDate()
        {
            return GetMondayDate(DateTime.Now);
        }
        /// <summary> 
        /// 计算本周周日的日期 
        /// </summary> 
        /// <returns></returns> 
        private DateTime GetSundayDate()
        {
            return GetSundayDate(DateTime.Now);
        }

        /// <summary> 
        /// 计算某日起始日期（礼拜一的日期） 
        /// </summary> 
        /// <param name="someDate">该周中任意一天</param> 
        /// <returns>返回礼拜一日期，后面的具体时、分、秒和传入值相等</returns> 
        public DateTime GetMondayDate(DateTime someDate)
        {
            int i = someDate.DayOfWeek - DayOfWeek.Monday;
            if (i == -1) i = 6;// i值 > = 0 ，因为枚举原因，Sunday排在最前，此时Sunday-Monday=-1，必须+7=6。 
            TimeSpan ts = new TimeSpan(i, 0, 0, 0);
            return someDate.Subtract(ts);
        }

        /// <summary> 
        /// 计算某日结束日期（礼拜日的日期） 
        /// </summary> 
        /// <param name="someDate">该周中任意一天</param> 
        /// <returns>返回礼拜日日期，后面的具体时、分、秒和传入值相等</returns> 
        public DateTime GetSundayDate(DateTime someDate)
        {
            int i = someDate.DayOfWeek - DayOfWeek.Sunday;
            if (i != 0) i = 7 - i;// 因为枚举原因，Sunday排在最前，相减间隔要被7减。 
            TimeSpan ts = new TimeSpan(i, 0, 0, 0);
            return someDate.Add(ts);
        }

        public string GetTimeLength(DateTime beginTime, DateTime endTime)
        {
            try
            {
                string timeLength = string.Empty;
                TimeSpan begin = new TimeSpan(beginTime.Ticks);
                TimeSpan end = new TimeSpan(endTime.Ticks);
                TimeSpan ts = begin.Subtract(end).Duration();

                timeLength = Convert.ToString(ts.Hours * 60 + ts.Minutes);

                return timeLength;
            }
            catch
            {
            }
            return string.Empty;
        }

        public bool IsToday(string date)
        {
            //入参
            DateTime dt = DateTime.Parse(date);
            //当前日期
            DateTime today = DateTime.Today;
            DateTime tempToday = new DateTime(dt.Year, dt.Month, dt.Day);
            if (today != tempToday) return false;
            return true;

            //if (input.Date != DateTime.Now.Date)
            //{
            //    //MessageBox.Show("不是当天");
            //    return false;
            //}
            //return true;
        }

        public bool IsToday(DateTime dt)
        {
            DateTime today = DateTime.Today;
            DateTime tempToday = new DateTime(dt.Year, dt.Month, dt.Day);
            if (today != tempToday) return false;
            return true;
        }


    }
}