Function ibvAgeBandDays
Description
This function is given two dates, a base date to age from and the date
of a posting. It produces an age band value that splits conventionally
according less than 30, less than 60 less than 90 n so on and returns
the result as a string, chosen to sort correctly.
The routine will work for four bands (three cutoff points) or seven
(six cutoff points).
Parameters
| pBaseDate |
The date to age from |
| pPostDate |
The date of the posting |
| pBands |
The number of bands (4 or 7) |
| Returns |
The Age band as a string |
