Leap year EntityFunctions.CreateDateTime problem in linq for object

Question

When I have a leap year in my database (e.g. February 29, 2012). EntityFunctions.CreateDateTime functions returnSystem.Data.SqlClient.SqlException: Conversion failed when converting date and/or time from character string.

My code is as follows in my asp.net mvc (C #) application:

from u in _entities.tt_Users
let _start_date = u.Start_Date
let _startDate = _start_date.Day
let _startmonth = _start_date.Month
let _startyear = _start_date.Year
let _starthour = u.Start_Time.Value.Hours
let _startminutes = u.Start_Time.Value.Minutes
let _startseconds = u.Start_Time.Value.Seconds
let _startDateWithTime = EntityFunctions.CreateDateTime(_startyear, _startmonth, _startDate, _starthour, _startminutes, _startseconds)
let _startDateWithZeroTime = EntityFunctions.CreateDateTime(_startyear, _startmonth, _startDate, 0, 0, 0)
let _start_datetime = u.Is_Include_Time ? _startDateWithZeroTime : _startDateWithTime
let _end_date = u.End_Date
let _endDate = _end_date.Day
let _endmonth = _end_date.Month
let _endyear = _end_date.Year
let _endhour = u.End_Time.Value.Hours
let _endminutes = u.End_Time.Value.Minutes
let _endseconds = u.End_Time.Value.Seconds
let _endDateWithTime = EntityFunctions.CreateDateTime(_endyear, _endmonth, _endDate, _endhour, _endminutes, _endseconds)
let _endDateWithZeroTime = EntityFunctions.CreateDateTime(_endyear, _endmonth, _endDate, 0, 0, 0)
let _end_datetime = u.Is_Include_Time ? _endDateWithZeroTime : _endDateWithTime
let _cur_Start_date = u.Is_Include_Time ? _userStartDate : _gMTStartDate
let _cur_End_date = u.Is_Include_Time ? _userEndDate : _gMTEndDate
where u.User_Id == 1 && !u.Is_Deleted
&& _start_datetime >= _cur_Start_date && _end_datetime <= _cur_End_date
select new
{
  u.User_id,
  u.User_Name,
  u.Login_Name,
  u.Email_Address
};

Here _userStartDate, _userEndDate, _gMTStartDate and _gMTEndDate are the parameters of my function.

If the column "Is_Include_Time" is true, then I have to include TimeSpan also from the table. But in a leap year he threw a mistake.

Any suggestions?

Answer 1

. , datetime. , :

            DateTime startDate = new DateTime(1, 1, 1);
            var counters = from counter in entities.Counter
                           let date = SqlFunctions.DateAdd("day", counter.DayOfMonth-1, SqlFunctions.DateAdd("month", counter.Month-1, SqlFunctions.DateAdd("year", counter.Year-1, startDate)))
                           where date >= dateFrom && date <= dateTo
                           orderby date
                           select new
                           {
                               Value = counter.CounterValue,
                               Date = date
                           };

, .

, -

Answer 2

linq,

Answer 3

This is how I deal with

var minDate = Convert.ToDateTime("1900-01-01 00:00:00");
return source.Where(x => EntityFunctions.DiffDays(x.ReviewedDate, minDate) > 0).ToList();