diff --git a/README.md b/README.md
index d38501a..30d45d3 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,14 @@ The following policy must be attached to the AWS role to be executed.
 }
 ```
 
+## Environment Variable
+
+|name            |required|default|description                                       |
+|----------------|--------|-------|--------------------------------------------------|
+|ALERT_HOURS     |no      | 2160  | Time to determine "alert" status for EOL dates   |
+|WARNING_HOURS   |no      | 4320  | Time to determine "warning" status for EOL dates |
+|AWS_API_INTERVAL|no      | 300   | Interval between calls to the AWS API            |
+
 ## Datadog Autodiscovery
 
 If you use Datadog, you can use [Kubernetes Integration Autodiscovery](https://docs.datadoghq.com/agent/kubernetes/integrations/?tab=kubernetes) feature.
diff --git a/main.go b/main.go
index 397bd58..45da6ce 100644
--- a/main.go
+++ b/main.go
@@ -204,6 +204,36 @@ func getInterval() (int, error) {
 	return integerGithubAPIInterval, nil
 }
 
+func getAlertHours() (int, error) {
+	const defaultAlertHours = 2160 // 90 days * 24 hour
+	alertHours := os.Getenv("ALERT_HOURS")
+	if len(alertHours) == 0 {
+		return defaultAlertHours, nil
+	}
+
+	integerAlertHours, err := strconv.Atoi(alertHours)
+	if err != nil {
+		return 0, fmt.Errorf("failed to read Alert Hours: %w", err)
+	}
+
+	return integerAlertHours, nil
+}
+
+func getWarningHours() (int, error) {
+	const defaultWarningHours = 4320 // 180 days * 24 hour
+	warningHours := os.Getenv("WARNING_HOURS")
+	if len(warningHours) == 0 {
+		return defaultWarningHours, nil
+	}
+
+	integerWarningHours, err := strconv.Atoi(warningHours)
+	if err != nil {
+		return 0, fmt.Errorf("failed to read Warning Hours: %w", err)
+	}
+
+	return integerWarningHours, nil
+}
+
 func getRDSClusters() ([]RDSInfo, error) {
 	sess := session.Must(session.NewSessionWithOptions(session.Options{
 		SharedConfigState: session.SharedConfigEnable,
@@ -339,8 +369,16 @@ func validateEOLStatus(rdsInfo RDSInfo, minimumSupportedInfos []MinimumSupported
 func validateEOLDate(validDate string, now time.Time) (string, error) {
 	var layout = "2006-01-02"
 	var eolStatus string
-	const alertHours = 30 * 24   // 30 Days
-	const warningHours = 90 * 24 // 90 Days
+
+	alertHours, err := getAlertHours()
+	if err != nil {
+		return "", fmt.Errorf("failed to get Alert Hour: %w", err)
+	}
+
+	warningHours, err := getWarningHours()
+	if err != nil {
+		return "", fmt.Errorf("failed to get Warning Hour: %w", err)
+	}
 
 	dueDate, err := time.Parse(layout, validDate)
 	if err != nil {
@@ -350,9 +388,9 @@ func validateEOLDate(validDate string, now time.Time) (string, error) {
 	switch {
 	case now.After(dueDate):
 		eolStatus = "expired"
-	case now.After(dueDate.Add(-1 * alertHours * time.Hour)):
+	case now.After(dueDate.Add(-1 * time.Duration(alertHours) * time.Hour)):
 		eolStatus = "alert"
-	case now.After(dueDate.Add(-1 * warningHours * time.Hour)):
+	case now.After(dueDate.Add(-1 * time.Duration(warningHours) * time.Hour)):
 		eolStatus = "warning"
 	default:
 		eolStatus = "ok"
diff --git a/main_test.go b/main_test.go
index d83c6be..03edbfd 100644
--- a/main_test.go
+++ b/main_test.go
@@ -26,10 +26,10 @@ func TestValidateEOLDate(t *testing.T) {
 		{name: "Expired", validDate: "2020-12-31", now: now, out: "expired"},
 		{name: "Alert", validDate: "2021-01-01", now: now, out: "alert"},
 		{name: "Alert", validDate: "2021-01-02", now: now, out: "alert"},
-		{name: "Warning", validDate: "2021-01-30", now: now, out: "alert"},
-		{name: "Warning", validDate: "2021-01-31", now: now, out: "warning"},
-		{name: "Warning", validDate: "2021-03-31", now: now, out: "warning"},
-		{name: "OK", validDate: "2021-04-01", now: now, out: "ok"},
+		{name: "Warning", validDate: "2021-03-30", now: now, out: "alert"},
+		{name: "Warning", validDate: "2021-04-01", now: now, out: "warning"},
+		{name: "Warning", validDate: "2021-06-29", now: now, out: "warning"},
+		{name: "OK", validDate: "2021-06-30", now: now, out: "ok"},
 	}
 
 	for _, tt := range tests {