public void FormatPartial()
        {
            var builder = new StringBuilder("x");
            var offset  = Offset.FromHoursAndMinutes(20, 30);

            SimpleOffsetPattern.FormatPartial(offset, builder);
            Assert.AreEqual("x20:30", builder.ToString());
        }
 public void FormatPartial(Offset value, StringBuilder builder)
 {
     if (value == Offset.Zero)
     {
         builder.Append("Z");
     }
     else
     {
         fullPattern.FormatPartial(value, builder);
     }
 }