Distinct Date with Linq

I have an entity called Billings with a property of DateTime. I need to uniquely find the dates so I can go through them and do some stuff. I tried:

var DistinctYearMonthsDays = (from t in db.Billings 
                              where t.DateTime.HasValue 
                              select   t.DateTime.Value.Date).Distinct();

foreach (var day in DistinctYearMonthsDays)

but I get (on the foreach):

The specified type member 'Date' is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties are supported.

After searching I also tried the following without success:

IEnumerable<DateTime> DistinctYearMonthsDays = db.Billings
    .Select(p => new 
         .Select(x => new DateTime(x.Year,x.Month,x.Day));

Any help will be very much appreciated.


You can use the built in EntityFunctions. Your query would become:

var DistinctYearMonthsDays = (from t in db.Billings 
                              where t.DateTime.HasValue 
                              select EntityFunctions.TruncateTime(t.DateTime)).Distinct();

For more about EntityFunctions, check MSDN.

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