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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 1, less than 2, less than 3 and 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).
| 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 |