C# Linq compare only date from a datetime property

Question

I have the following Linq to Entity:

var details = Uow.EmployeeAttendances.GetAllReadOnly()
    .Where(a => a.EmployeeId == summary.EmployeeId && a.Timestamp == summary.Date)
    .ToList();

summary.Date is just the date part so the value is like this: '2014-07-20 00:00:00'

The problem is that a.TimeStamp is a DateTime field with both date and time.

So the above query always return empty

Any way I can convert a.TimeStamp just to Date so I can compare apples with apples?

The error that I get is:

The specified type member 'Date' is not supported in LINQ to Entities

Appreciate it.

Answer 1

DateTime fields have a Date property , so we can simply do:

var details =
    Uow
        .EmployeeAttendances
        .GetAllReadOnly()
        .Where(a => a.EmployeeId == summary.EmployeeId
            && a.TimeStamp.Date == summary.Date)
        .ToList();

Answer 2

The right solution is:

In Entity Framework 6, you have to use DbFunctions.TruncateTime.

  var dates = Uow.EmployeeAttendances.GetAllReadOnly()
                .Where(a => a.EmployeeId == summary.EmployeeId && System.Data.Entity.DbFunctions.TruncateTime(a.Timestamp) == attendanceDate)
                .OrderBy(a=> a.Timestamp)
                .ToList();

Answer 3

As an alternative to using DbFunctions.TruncateTime, you can simply do the following:

var from = summary.Date;
var to = summary.Date.AddDays(1);
var details = Uow.EmployeeAttendances
  .GetAllReadOnly()
  .Where(a => a.EmployeeId == summary.EmployeeId && a.Timestamp >= from && a.Timestamp< to)
  .ToList();

Answer 4

Try it

     string f = summary.ToString("MM/dd/yyyy");
     summary= Convert.ToDateTime(f); // time at 12:00 start date
     var details = Uow.EmployeeAttendances.GetAllReadOnly()
    .Where(a=>a.EmployeeId== summary.EmployeeId &&
    a.Timestamp == summary).ToList();

Answer 5

you can use DateTime.Compare for example

var details = Uow.EmployeeAttendances.GetAllReadOnly()
.Where(a => a.EmployeeId == summary.EmployeeId && DateTime.Compare(x.Timestamp .Date, summary.Date) == 0).ToList();

or use EntityFunctions

    var details = Uow.EmployeeAttendances.GetAllReadOnly()
.Where(a => a.EmployeeId == summary.EmployeeId &&  EntityFunctions.TruncateTime(x.Timestamp)==  EntityFunctions.TruncateTime(summary.Date)).ToList();