Yolanda Broad wrote:
Once upon a time, paid membership was classified as "premium," rather than "platinum," then there was an intermediate period when there were two levels of paid membership, "premium" and "platinum," with "premium" eventually disappearing into the sunset. Thus, when I first became a paid member, it was at the "premium" level. When that was I no longer remember, but it was back in the very early days of ProZ.com (back when we were still using covered wagons).
The "platinum-since" date should be set to the earliest date of any paying membership, including the early premium membership.