Currently, the listing only shows month, date, and time. E.g. Created 28 Feb 07:39. There is no year (was 2019 in this case). I understand that it looks bad when many ideas are more than a year old, but currently it's quite confusing. Should be ok to don't show the year for the current year (or past 365 days) as I've seen in some other products.
The year is visible once you open the idea, so there is no point it not showing it in the list.