C# DateTime.Equals方法代碼示例

        public static bool CompareDate(DateTime dateToCompare, DateTime date, int minuteTolerance)
        {
            if (!dateToCompare.Equals(date))
            {
                date = date.AddMinutes(minuteTolerance);

                if (!dateToCompare.Equals(date))
                {
                    date = date.AddMinutes(-2 * minuteTolerance);

                    if (!dateToCompare.Equals(date))
                    {
                        return false;
                    }
                    else
                    {
                        return true;
                    }
                }
                else
                {
                    return true;
                }
            }
            else
            {
                return true;
            }
        }

    static int Workdays(DateTime inputDate)
    {
        DateTime today = new DateTime();
        today = DateTime.Today;
        DateTime [] hollidays = 
        { 
            new DateTime(2013,5,1),   
            new DateTime(2013,5,2),
            new DateTime(2013,5,3),
            new DateTime(2013,5,6),
            new DateTime(2013,5,24),
            new DateTime(2013,9,6),
            new DateTime(2013,12,24),
            new DateTime(2013,12,25),
            new DateTime(2013,12,26)
        };
        
        bool isWorkday = true;
        int countWorkdays = 0;
        today = today.AddDays(1);
        while (today.Equals(inputDate) == false)
        {
            string day = today.DayOfWeek.ToString();
            if (day.CompareTo("Sunday") == 0 || day.CompareTo("Saturday") == 0)
            {
                isWorkday = false;
            }

            if (isWorkday)
            {
                foreach (var date in hollidays)
                {
                    if (today.Equals(date))
                    {
                        isWorkday = false;
                        break;
                    }
                }
            }

            if (isWorkday)
            {
                countWorkdays++;
            }

            else
            {
                isWorkday = true;
            }

            today = today.AddDays(1);
        }

        return countWorkdays;
    }

 /// <summary>
 /// 時間顯示格式處理
 /// </summary>
 /// <param name="d">時間值</param>
 /// <param name="format">格式字符串。</param>
 /// <returns></returns>
 public static string GetDateString(DateTime d, string format)
 {
     if (d == null || d.ToString() == "" || d.Equals(Utils.GetDateTime("1900-1-1 0:00:00")) || d.Equals(Utils.GetDateTime("0001-01-01 0:00:00")))
     {
         return "";
     }
     else
     {
         return d.ToString(format);
     }
 }

        public void CanConvertBothDirections()
        {
            var now = DateTime.UtcNow;

            var nowWithoutMs = new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, now.Second,
                                            now.Millisecond, DateTimeKind.Utc);
            var rightNow = now.ToMillisecondTimestamp().ToDateTime();

            Assert.IsTrue(nowWithoutMs.Equals(rightNow));

            var yesterday = (nowWithoutMs.ToMillisecondTimestamp() - (long)TimeSpan.FromDays(1).TotalMilliseconds).ToDateTime();
            var dayAfterTomorrow = yesterday.AddDays(1);

            Assert.IsTrue(nowWithoutMs.Equals(dayAfterTomorrow.ToUniversalTime()));
        }

        /// <summary>
        /// Method to take screenshot from primary screen, change it's creation time and save it into the folder
        /// </summary>
        /// <param name="creationTime"></param>
        /// <param name="screenPath"></param>
        /// <returns></returns>
        public static string TakeScreenshot(DateTime creationTime = default(DateTime), string screenPath = "")
        {
            var format = ImageFormat.Png;
            var now = DateTime.Now;
            creationTime = creationTime.Equals(default(DateTime)) ? now : creationTime;
            var screenName = GetScreenName(creationTime, format);

            using (var bmpScreenCapture = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
                                            Screen.PrimaryScreen.Bounds.Height))
            {
                using (var g = Graphics.FromImage(bmpScreenCapture))
                {
                    g.CopyFromScreen(Screen.PrimaryScreen.Bounds.X,
                                     Screen.PrimaryScreen.Bounds.Y,
                                     0, 0,
                                     bmpScreenCapture.Size,
                                     CopyPixelOperation.SourceCopy);

                    var file = (screenPath.Equals("") ? GetPath() : screenPath) + screenName;
                    bmpScreenCapture.Save(file, format);
                    var fileInfo = new FileInfo(file);
                    fileInfo.Refresh();
                    fileInfo.CreationTime = creationTime;

                }
            }
            return screenName;
        }

        static bool IsPublicHoliday(DateTime date)
        {
            bool isHoliday = false;

            List<DateTime> publicHolidaysList = new List<DateTime>();

            publicHolidaysList.Add(Convert.ToDateTime("1.1.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("2.1.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("3.3.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("10.4.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("13.4.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("1.5.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("6.5.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("24.5.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("6.9.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("22.9.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("24.12.2015"));
            publicHolidaysList.Add(Convert.ToDateTime("25.12.2015"));

            foreach (var holiday in publicHolidaysList)
            {
                if (date.Equals(holiday))
                {
                    isHoliday = true;
                    break;
                }
            }
            return isHoliday;
        }

 public void ToDateRemovesAllTimePortion()
 {
   Date d1 = new DateTime(2001, 2, 3, 4, 5, 6, 7).AddTicks(8).ToDate();
   Date d2 = new Date(2001, 2, 3);
   Assert.AreEqual(d1, d2);
   Assert.IsTrue(d1.Equals(d2));
 }

 public Order(int id, string customerid, int employeeid, DateTime orderdate, DateTime requireddate, 
     DateTime shippeddate, int shipvia, double freight, string shipname, string shipaddress, string shipcity, 
     string shiparegion, string shippostalcode, string shipcountry, List<OrderDetails> details)
 {
     ID = id;
     CustomerID = customerid;
     EmployeeID = employeeid;
     OrderDate = orderdate;
     RequiredDate = requireddate;
     ShippedDate = shippeddate;
     ShipVia = shipvia;
     Freight = freight;
     ShipName = shipname;
     ShipAddress = shipaddress;
     ShipCity = shipcity;
     ShipRegion = shiparegion;
     ShipPostalCode = shippostalcode;
     ShipCountry = shipcountry;
     Details = details;
     if (orderdate.Equals(DateTime.MinValue))
         Status = OrderStatus.NEW;
     else if (ShippedDate.Equals(DateTime.MinValue))
         Status = OrderStatus.NOTSHIPPED;
     else
         Status = OrderStatus.SHIPPED;
 }

        DateTime? RepairDate(DateTime? datetime)
        {
            if (datetime.HasValue && datetime.Equals(DateTime.MinValue))
                return null;

            return datetime;
        }

 protected ElectionEvent(DateTime date, string name)
 {
     Contract.Requires(!date.Equals(null));
     Contract.Requires(!string.IsNullOrEmpty(name));
     _date = date;
     _name = name;
 }

 private string SerieData()
 {
     string data = "";
     var transactions = (from trs in db.Transactions
                         group trs by new { Year = trs.Date.Year, Month = trs.Date.Month, Day = trs.Date.Day } into g
                         orderby g.Key.Year, g.Key.Month, g.Key.Day
                         select new { Year = g.Key.Year, Month = g.Key.Month, Day = g.Key.Day, Value = g.Max(i=>i.Rest) })
             .ToList();
     var value = transactions.First().Value;
     DateTime date = new DateTime(transactions.First().Year, transactions.First().Month, transactions.First().Day).Date;
     foreach (var transaction in transactions)
     {
         DateTime transactionDate = new DateTime(transaction.Year, transaction.Month, transaction.Day).Date;
         while (!transactionDate.Equals(date))
         {
             data += "[Date.UTC("
             + date.Year.ToString() + ","
             + (date.Month - 1).ToString() + ","
             + date.Day.ToString() + "),"
             + value.ToString().Replace(',', '.') + "],"
             ;
             date = date.AddDays(1);
         }
         value = transaction.Value;
         date = transactionDate;
         data += "[Date.UTC("
         + transaction.Year.ToString() + ","
         + (transaction.Month - 1).ToString() + ","
         + transaction.Day.ToString() + "),"
         + transaction.Value.ToString().Replace(',', '.') + "],"
         ;
     }
     return "[" + data.Remove(data.Length - 1) + "]";
 }

        public static bool DateInBetween(DateTime targetDate, DateTime start, DateTime end)
        {
            try
            {
                if (targetDate != null && targetDate != default(DateTime))
                {
                    if (start.Equals(default(DateTime)))
                    {
                        return true;
                    }
                    if (start.CompareTo(targetDate) < 0)
                    {
                        if (end.Equals(default(DateTime)))
                            return true;
                        else if (end != default(DateTime) && end.CompareTo(targetDate) > 0)
                            return true;
                        else
                            return false;

                    }

                }
            }
            catch (Exception  ex)
            {

                Utility.WriteLogError("Exception Occurred in verification of Dates" + ex.ToString());
            }
            return false;
        }

    static int CalculateWorkDays(DateTime today, DateTime date)
    {
        bool isHoliday = false;
        int numberOfWorkDays = 0;

        while (today.CompareTo(date) != 1)
        {
            isHoliday = false;

            foreach (DateTime holiday in holidays)
            {
                if (today.Equals(holiday))
                {
                    isHoliday = true;
                    break;
                }
            }


            if (!isHoliday && today.DayOfWeek != DayOfWeek.Saturday && today.DayOfWeek != DayOfWeek.Sunday)
            {
                numberOfWorkDays++;
            }

            today = today.AddDays(1);
        }

        return numberOfWorkDays;
    }

        public static object ReturnNullIfEmpty(DateTime value)
        {
            if (value.Equals(DateTime.MinValue))
                return null;

            return value;
        }

 public static string FormatDate(DateTime dateTime)
 {
     if (dateTime.Equals(DateTime.MinValue))
         return string.Empty;
     if (DateTime.Now.Subtract(dateTime).TotalDays > 365)
         return dateTime.ToString("yyyy");
     return DateTime.Now.Year == dateTime.Year ? dateTime.ToString("MM-dd") : dateTime.ToString("yyyy-MM-dd");
 }