I guess a plausible explanation could be that the widget display is timezone-aware in some way while the rest is not, so that when a dated URL is entered or a date selected in the calendar on my computer, say 11 June 2019, this is on as the time point 2019-06-11 00:00:00 in my time zone, which is converted to Eastern time 2019-06-10 18:00:00 and displayed as date only. The problem would then not show up in any regular US time zone.
― anatol_merklich, Wednesday, 12 June 2019 22:00 (two years ago) link
*"this is on" -> "this is seen"
― anatol_merklich, Wednesday, 12 June 2019 22:01 (two years ago) link