NLite.Data.Test.DateTimeTest.DateDiffDay C# (CSharp) Method

        public virtual void DateDiffDay()
        {
            DateTime dt = new DateTime(1997, 8, 25);
            DateTime dt1 = new DateTime(1996, 1, 15);
            var expected = (dt - dt1).Days;
            var actual = db.Orders.Select(o => o.OrderDate == dt && SqlMethods.DateDiffDay(o.OrderDate, dt1) == expected).FirstOrDefault();
            Assert.IsNotNull(actual);

            var item = db.Orders.Where(o => o.OrderDate == dt && SqlMethods.DateDiffDay(dt1, o.OrderDate) == expected).FirstOrDefault();
            Assert.IsNotNull(item);
        }