These docs are for an old release.
Info on upgrading to v4
defaultRangeSeparator
The separator text used for date-formatting-string ranges throughout the API.
String, default: ' - '
This calendar-wide setting affects settings that render date ranges, like timeFormat. The default will look something like 2:00pm - 3:00pm.
If you want to customize the title in the toolbar, use titleRangeSeparator instead.