Calculate Recurrence Index from Master and Recurrence Start Date

I am synchronizing events between Exchange and the VCL Scheduler control. I know this is filed under .NET - stick with me! My synchronization code is in C#. There is no VCL code, I am just synchronizing with the underlying DB.

I am at a bit of a sticking point and wondering if I can make use of the XtraScheduler code (or, if needed, the VCL scheduler code via a DLL) in order to find out the following:

Given a recurring pattern's master event information AND the start time of a single occurrence of that pattern, I need to know what the index of that occurrence WOULD be *even if* this occurrence does not exist outside of the pattern.

In other words, imagine there is no scheduler control. Is there any way to re-use any of the DX Scheduler code to determine the index (integer) of an occurrence of a pattern without it existing, and only knowing its start time?

The reason is that, when an occurrence of a pattern is deleted in Exchange, the only information available is the original start time of that single occurrence. There is nothing else provided for information on that occurrence, and no way to find (from Exchange) what the index was, as the occurrence is already deleted.

I'm sorry if that isn't clear. Hopefully I explained myself well. I started coding something myself but when you factor in all of the patterns and permutations I thought I may not need to reinvent the wheel.

Thanks!