SysQueryRangeUtil - Custom query function

In one of old post (Dynamics AX batch job relative day parameter), I've mention regarding using function in query range. There're a set of standard functions available in the SysQueryRangeUtil class. But if you happen to need a custom function (especially with more complex logic), you can develop it in this class and use it just like you'll do with the standard methods.

Example:

You can use this function in query object, under the "Range" node, or anywhere that provides filtering functionality.