public void Should_convert_gregorian_to_persian()
        {
            // Arrange
            var date     = new DateTime(2019, 1, 28);
            var expected = Utility.ConvertToPersian(date);
            // Act
            var persian = persianCalendar.ConvertToPersian(date);

            // Assert
            Assert.Equal(expected, persian);
        }
 public static string Today(this PersianCalendar persianCalendar)
 {
     return(persianCalendar.ConvertToPersian(DateTime.Today));
 }