On field edit form, check that "collect end date" is enabled... Now populate a node containing the field. You are no longer able to disable whether end date is required or not because it is disabled whenever the whole field "has data".

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energee created an issue. See original summary.

energee’s picture

Rolled against d 8.x

DamienMcKenna’s picture

Status: Needs review » Closed (won't fix)

Per our discussion in #2613454: Port Date module functionality missing from 8.x core, the D8 branch is no longer going to be worked on, all changes should be made directly to core's datetime module. That said, we appreciate everyone's efforts, so thank you.