It looks like timeline's logic is somehow flawed - my users at TechPresentations.org age complaining that date ranges (for conferences) don't show the last day of the range correctly - Timeline assumes 00:00 of the last day of the range to be the end of timeline item, but it's more logical to assume 23:59 to be the end of the range.

For example of the problem see the timeline of conference page: http://www.techpresentations.org/Conferences

            Sergey


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Sergey Chernyshev
http://www.sergeychernyshev.com/