refactoring: minor refactoring of PR #8916

CHANGELOG.md

@@ -19,6 +19,7 @@
 * **Prometheus**: Add support for instant queries [#5765](https://github.com/grafana/grafana/issues/5765), thx [@mtanda](https://github.com/mtanda)
 * **Cloudwatch**: Add support for alerting using the cloudwatch datasource [#8050](https://github.com/grafana/grafana/pull/8050), thx [@mtanda](https://github.com/mtanda)
 * **Pagerduty**: Include triggering series in pagerduty notification [#8479](https://github.com/grafana/grafana/issues/8479), thx [@rickymoorhouse](https://github.com/rickymoorhouse)
+* **Timezone**: Time ranges like Today & Yesterday now work correctly when timezone setting is set to UTC [#8916](https://github.com/grafana/grafana/issues/8916), thx [@ctide](https://github.com/ctide)
 
 ## Minor
 * **SMTP**: Make it possible to set specific EHLO for smtp client. [#9319](https://github.com/grafana/grafana/issues/9319)

public/app/features/dashboard/time_srv.ts

@@ -195,7 +195,8 @@ class TimeSrv {
       from: moment.isMoment(this.time.from) ? moment(this.time.from) : this.time.from,
       to: moment.isMoment(this.time.to) ? moment(this.time.to) : this.time.to,
     };
-    var timezone = this.dashboard && this.dashboard.getTimezone ? this.dashboard.getTimezone() : 'local';
+
+    var timezone = this.dashboard && this.dashboard.getTimezone();
 
     return {
       from: dateMath.parse(raw.from, false, timezone),

public/app/features/panel/metrics_panel_ctrl.ts

@@ -217,10 +217,8 @@ class MetricsPanelCtrl extends PanelCtrl {
       "__interval_ms":  {text: this.intervalMs, value: this.intervalMs},
     });
 
-    var timezone = this.dashboard.getTimezone ? this.dashboard.getTimezone() : 'local';
-
     var metricsQuery = {
-      timezone: timezone,
+      timezone: this.dashboard.getTimezone(),
       panelId: this.panel.id,
       range: this.range,
       rangeRaw: this.range.raw,