Filtering by date presets (custom roadmaps views displaying a custom date selection)

Problem

Currently roadmaps are always loaded with the "today" date in the middle and a preset date range for X width. We might want to give people a custom roadmap view + link.. in order to display a certain selection of epics on a certain date range.

Probable requirements

https://gitlab.com/gitlab-org/gitlab-ee/issues/3756 Dynamic scaling of roadmap timeline

Proposal

Have a way to select a custom date preset

early related mockup: