RelativePosition specifies the relative position of the occurrence of the week-day within a month or a year. Valid values are 1 to 5 and -5 to -1 for monthly rule and 1 to 53 and -53 to -1 for yearly rule. For example, if Day is Monday and the RelativePosition is -1, then it specifies the last Monday in the month.
Target Platforms: Android 4.4+, iOS 8+
Development Environments: Visual Studio 2015+, Visual Studio for Mac Preview, Xamarin for Visual Studio 4.2+