Posterboard multiday events error

For multiday events in posterboard view the dates that appear in the upper right color block (.ai1ec-posterboard-view .ai1ec-date-block-wrap) are incorrect. The start date is correct, but the end date is one day off (one day later than the event end date.) The dates are correct under the title ( .ai1ec-posterboard-view .ai1ec-event-time).

https://ww.wp.xz.cn/plugins/all-in-one-event-calendar/