EF Core SQL Server NodaTime DateDiff

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The DATEPART function returns the count (as a signed integer value) of the specified datepart boundaries crossed between the specified start date and end date.

The SimplerSoftware.EntityFrameworkCore.SqlServer.NodaTime provides the following methods which use the DATEDIFF function.

  • DateDiffDay
  • DateDiffHour
  • DateDiffMicrosecond
  • DateDiffMillisecond
  • DateDiffMinute
  • DateDiffMonth
  • DateDiffNanosecond
  • DateDiffSecond
  • DateDiffWeek
  • DateDiffYear

Let's consider the following simple example which uses the DateDiffDay method.

public static void Example1()
    using (EmployeeContext context = new EmployeeContext())
        DbFunctions dbFunctions = null;

        var thisYearTasks = context.Tasks
            .Where(t => dbFunctions.DateDiffDay(t.Date, new LocalDate(2021, 1, 1)) >= 150);


Let's run the above example and you will see the following output.

SELECT [t].[Id], [t].[Date], [t].[EmployeeId], [t].[EndTime], [t].[ScheduledDuration], [t].[StartTime]
FROM [Tasks] AS [t]
WHERE DATEDIFF(DAY, [t].[Date], '2021-01-01') >= 150

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