diff --git a/docs/content/doc/usage/filters.md b/docs/content/doc/usage/filters.md
index 81627da49..b7885efc9 100644
--- a/docs/content/doc/usage/filters.md
+++ b/docs/content/doc/usage/filters.md
@@ -33,6 +33,8 @@ The available fields for filtering include:
 
 You can date math to set relative dates. Click on the date value in a query to find out more.
 
+All strings must be either single-word or enclosed in `"` or `'`. This extends to date values like `2024-03-11`.
+
 ## Operators
 
 The available operators for filtering include:
diff --git a/frontend/src/views/project/helpers/useGanttFilters.ts b/frontend/src/views/project/helpers/useGanttFilters.ts
index b245a16f5..dfe8ccd8b 100644
--- a/frontend/src/views/project/helpers/useGanttFilters.ts
+++ b/frontend/src/views/project/helpers/useGanttFilters.ts
@@ -79,7 +79,7 @@ function ganttFiltersToApiParams(filters: GanttFilters): TaskFilterParams {
 	return {
 		sort_by: ['start_date', 'done', 'id'],
 		order_by: ['asc', 'asc', 'desc'],
-		filter: 'start_date >= ' + isoToKebabDate(filters.dateFrom) + ' && start_date <= ' + isoToKebabDate(filters.dateTo),
+		filter: 'start_date >= "' + isoToKebabDate(filters.dateFrom) + '" && start_date <= "' + isoToKebabDate(filters.dateTo) + '"',
 		filter_include_nulls: filters.showTasksWithoutDates,
 	}
 }