UTC to local time using Linq to Entities

Question

I need to translate a field from UTC to local time in a LINQ to Entities query. But it does not recognize the method \'System.DateTime ToLocalTime\' that I was intended to use.

Answer 1

To be able to use functions that don't translate to SQL, you need to materialize the table.

var materializedRequests = Requests.Where(x => !x.Resolved).ToList(); //Materialize list with a ToList call

materializedRequests
    .Where(x =>
        !materializedRequests.Any(y => 
            y.IncommingDateTime.ToLocalTime().Day == x.IncommingDateTime.ToLocalTime().Day
        )
    )

Then you can use pretty much any functions you want. However, materializing the list is a VERY expensive call. Try to filter the list as much as you can before you materialize it.