Date range controls are the most-used feature. When they break, everything feels broken.
Not Affecting Charts
Control and chart must use same data source and date field. In blended data, date field must match exactly.
No Comparison Period
Enable in both control settings AND chart Style panel. Some chart types show comparison differently.
Wrong Data
Timezone mismatch between source and Looker Studio. Check source timezone settings.
"No Data" for Recent Dates
GA4 has 24-48 hour processing delay. Exclude current day: "Last 28 days" instead of "Last 30 days." Contact us for quick fixes.