My code, for right or wrong, was using the Index value of time zones to
store user time zone selections in my database. Now that Microsoft is
removing the Index value I'm trying to figure out what do to do. I have two
issues:

1) I build up a collection of time zone objects and use the Index value as
the key.

2) I store the Index value in my database in various places to identify time
zones.

Not sure what to do about this. How can I now uniquely identify time zones
and how do migrate the current time zone Index values to the new
identification scheme?