Documentation
One global filter bar re-slices every chart on a dashboard at once — a date range and a time grain that each chart maps to its own date column.

When you pin a date-based chart, Glimpse BI infers which column and dimension the global range should drive (its “filter mapping”). You can adjust or exempt the mapping per chart, so a KPI that should always show all-time totals can opt out.
Filter values flow into charts as bound runtime parameters — including into SQL-mode charts via {{gbi:date_from}} / {{gbi:date_to}} placeholders. Nothing is string-concatenated into the query.
Start with the free plugin from WordPress.org. Upgrade to Pro to unlock Ask, pre-computed charts and Editor roles.