System.Tests.DateTimeTests.GetDateTimeFormats C# (CSharp) Method

        public static void GetDateTimeFormats()
        {
            var allStandardFormats = new char[]
            {
            'd', 'D', 'f', 'F', 'g', 'G',
            'm', 'M', 'o', 'O', 'r', 'R',
            's', 't', 'T', 'u', 'U', 'y', 'Y',
            };

            var dateTime = new DateTime(2009, 7, 28, 5, 23, 15);
            var formats = new List<string>();

            foreach (char format in allStandardFormats)
            {
                string[] dates = dateTime.GetDateTimeFormats(format);

                Assert.True(dates.Length > 0);

                DateTime parsedDate;
                Assert.True(DateTime.TryParseExact(dates[0], format.ToString(), CultureInfo.CurrentCulture, DateTimeStyles.None, out parsedDate));

                formats.AddRange(dates);
            }

            List<string> actualFormats = dateTime.GetDateTimeFormats().ToList();
            Assert.Equal(formats.OrderBy(t => t), actualFormats.OrderBy(t => t));

            actualFormats = dateTime.GetDateTimeFormats(CultureInfo.CurrentCulture).ToList();
            Assert.Equal(formats.OrderBy(t => t), actualFormats.OrderBy(t => t));
        }