I came across a thread (via google) that discussed winter gardening and what people were growing. I don't recall the details right now but at the time I noticed the posts all said "two years ago" which wasn't too helpful as people were discussing their zone and what they were planting at that time.
If the posts had listed an actual date/month it would have been really helpful so readers that came along a year or more later would know what time of year the posts were made (i.e. October vs February).