[O] Missing Agenda Export in ICS

[SabreWolfy]

I'm using Org-mode 8.2.7c. I exported my Agenda with "C-x C-w" and specified
an ICS file, which I then imported into Google Calendar. Many events
appeared, but some did not. An example of one, which did not appear, was a
standard timestamp event, where other "standard" ones also appeared. What
are the reasons that an item would not export?

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* Diary
** Entry does not work
<2014-09-15 Mon 18:00-20:00>
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This entry does not appear in the export. Other similar ones do appear.