to understand when exactly a comment was posted can make a difference in terms if whether it’s relevant (anymore) or not, so the date format should be clear.
at present you could come accros something like April 14 which could stand for 14th of April 2018 or April 2014.
wouldn’t it make sense to choose a date format that is chrystal clear and does not allow any disambigueties?
Even though I think the right solution would be not to need inside knowledge to understand the date of a post in one glance. If I where the admin of this forum I’d just set that up without any hesitation/discussion.