Individual posts in Groups are time-stamped in the upper right-hand corner. Yours was 6:36 e.g.:
That's fine in the a.m., but the system is using a 24-hour clock. Most of us can't immediately compute 18:36. Civilian time (a 12-hour clock, marked a.m. or p.m.) would be more helpful. Also, as we are posting all over the country, it would be helpful to note your time zone as well. (I'm on the West Coast, but I'm assuming your post was NOT 6:36 a.m. PDT!