diff --git a/pkg/collector/scaling_schedule_collector.go b/pkg/collector/scaling_schedule_collector.go
index 95e349e..8f54505 100644
--- a/pkg/collector/scaling_schedule_collector.go
+++ b/pkg/collector/scaling_schedule_collector.go
@@ -331,7 +331,7 @@ func calculateMetrics(spec v1.ScalingScheduleSpec, defaultScalingWindow time.Dur
 			}
 
 			// If no end time was provided, set it to equal the start time
-			if schedule.EndDate == nil || *schedule.EndDate == "" {
+			if schedule.EndDate == nil || string(*schedule.EndDate) == "" {
 				scheduledEndTime = scheduledTime
 			} else {
 				scheduledEndTime, err = time.Parse(time.RFC3339, string(*schedule.EndDate))
diff --git a/pkg/collector/scaling_schedule_collector_test.go b/pkg/collector/scaling_schedule_collector_test.go
index eef65d4..ecfaf13 100644
--- a/pkg/collector/scaling_schedule_collector_test.go
+++ b/pkg/collector/scaling_schedule_collector_test.go
@@ -249,6 +249,19 @@ func TestScalingScheduleCollector(t *testing.T) {
 			},
 			err: ErrInvalidScheduleDate,
 		},
+		{
+			msg: "Return error for one time config end date not in RFC3339 format",
+			schedules: []schedule{
+				{
+					date:     nowTime.Add(-time.Minute * 20).Format(time.RFC3339),
+					endDate:  nowTime.Add(1 * time.Hour).Format(time.RFC822),
+					kind:     "OneTime",
+					duration: 15,
+					value:    100,
+				},
+			},
+			err: ErrInvalidScheduleDate,
+		},
 		{
 			msg: "Return the right value for two one time config",
 			schedules: []schedule{