diff --git a/azuread/resource_service_principal_password.go b/azuread/resource_service_principal_password.go
index 54d9ea6c2..6b4d62bba 100644
--- a/azuread/resource_service_principal_password.go
+++ b/azuread/resource_service_principal_password.go
@@ -59,10 +59,20 @@ func resourceServicePrincipalPassword() *schema.Resource {
 			},
 
 			"end_date": {
-				Type:         schema.TypeString,
-				Required:     true,
-				ForceNew:     true,
-				ValidateFunc: validation.ValidateRFC3339TimeString,
+				Type:          schema.TypeString,
+				Optional:      true,
+				Computed:      true,
+				ForceNew:      true,
+				ConflictsWith: []string{"end_date_relative"},
+				ValidateFunc:  validation.ValidateRFC3339TimeString,
+			},
+
+			"end_date_relative": {
+				Type:          schema.TypeString,
+				Optional:      true,
+				ForceNew:      true,
+				ConflictsWith: []string{"end_date"},
+				ValidateFunc:  validate.NoEmptyStrings,
 			},
 		},
 	}
@@ -75,7 +85,6 @@ func resourceServicePrincipalPasswordCreate(d *schema.ResourceData, meta interfa
 	objectId := d.Get("service_principal_id").(string)
 	value := d.Get("value").(string)
 	// errors will be handled by the validation
-	endDate, _ := time.Parse(time.RFC3339, d.Get("end_date").(string))
 
 	var keyId string
 	if v, ok := d.GetOk("key_id"); ok {
@@ -89,6 +98,19 @@ func resourceServicePrincipalPasswordCreate(d *schema.ResourceData, meta interfa
 		keyId = kid
 	}
 
+	var endDate time.Time
+	if v := d.Get("end_date").(string); v != "" {
+		endDate, _ = time.Parse(time.RFC3339, v)
+	} else if v := d.Get("end_date_relative").(string); v != "" {
+		d, err := time.ParseDuration(v)
+		if err != nil {
+			return fmt.Errorf("unable to parse `end_date_relative` (%s) as a duration", v)
+		}
+		endDate = time.Now().Add(d)
+	} else {
+		return fmt.Errorf("one of `end_date` or `end_date_relative` must be specified")
+	}
+
 	credential := graphrbac.PasswordCredential{
 		KeyID:   p.String(keyId),
 		Value:   p.String(value),
diff --git a/azuread/resource_service_principal_password_test.go b/azuread/resource_service_principal_password_test.go
index 3767ae367..e6131a4a2 100644
--- a/azuread/resource_service_principal_password_test.go
+++ b/azuread/resource_service_principal_password_test.go
@@ -111,7 +111,37 @@ func TestAccAzureADServicePrincipalPassword_customKeyId(t *testing.T) {
 	})
 }
 
-func testCheckADServicePrincipalPasswordExists(name string) resource.TestCheckFunc {
+func TestAccAzureADServicePrincipalPassword_relativeEndDate(t *testing.T) {
+	resourceName := "azuread_service_principal_password.test"
+	applicationId, err := uuid.GenerateUUID()
+	if err != nil {
+		t.Fatal(err)
+	}
+	value, err := uuid.GenerateUUID()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testCheckADServicePrincipalDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccADServicePrincipalPassword_relativeEndDate(applicationId, value),
+				Check: resource.ComposeTestCheckFunc(
+					// can't assert on Value since it's not returned
+					testCheckADServicePrincipalPasswordExists(resourceName),
+					resource.TestCheckResourceAttrSet(resourceName, "start_date"),
+					resource.TestCheckResourceAttrSet(resourceName, "key_id"),
+					resource.TestCheckResourceAttrSet(resourceName, "end_date"),
+				),
+			},
+		},
+	})
+}
+
+func testCheckADServicePrincipalPasswordExists(name string) resource.TestCheckFunc { //nolint unparam
 	return func(s *terraform.State) error {
 		rs, ok := s.RootModule().Resources[name]
 		if !ok {
@@ -152,7 +182,7 @@ func testCheckADServicePrincipalPasswordExists(name string) resource.TestCheckFu
 	}
 }
 
-func testAccADServicePrincipalPassword_basic(applicationId, value string) string {
+func testAccADServicePrincipalPassword_template(applicationId string) string {
 	return fmt.Sprintf(`
 resource "azuread_application" "test" {
   name = "acctestspa%s"
@@ -161,13 +191,19 @@ resource "azuread_application" "test" {
 resource "azuread_service_principal" "test" {
   application_id = "${azuread_application.test.application_id}"
 }
+`, applicationId)
+}
+
+func testAccADServicePrincipalPassword_basic(applicationId, value string) string {
+	return fmt.Sprintf(`
+%s
 
 resource "azuread_service_principal_password" "test" {
   service_principal_id = "${azuread_service_principal.test.id}"
   value                = "%s"
   end_date             = "2020-01-01T01:02:03Z"
 }
-`, applicationId, value)
+`, testAccADServicePrincipalPassword_template(applicationId), value)
 }
 
 func testAccADServicePrincipalPassword_requiresImport(applicationId, value string) string {
@@ -186,13 +222,7 @@ resource "azuread_service_principal_password" "import" {
 
 func testAccADServicePrincipalPassword_customKeyId(applicationId, keyId, value string) string {
 	return fmt.Sprintf(`
-resource "azuread_application" "test" {
-  name = "acctestspa%s"
-}
-
-resource "azuread_service_principal" "test" {
-  application_id = "${azuread_application.test.application_id}"
-}
+%s
 
 resource "azuread_service_principal_password" "test" {
   service_principal_id = "${azuread_service_principal.test.id}"
@@ -200,5 +230,17 @@ resource "azuread_service_principal_password" "test" {
   value                = "%s"
   end_date             = "2020-01-01T01:02:03Z"
 }
-`, applicationId, keyId, value)
+`, testAccADServicePrincipalPassword_template(applicationId), keyId, value)
+}
+
+func testAccADServicePrincipalPassword_relativeEndDate(applicationId, value string) string {
+	return fmt.Sprintf(`
+%s
+
+resource "azuread_service_principal_password" "test" {
+  service_principal_id = "${azuread_service_principal.test.id}"
+  value                = "%s"
+  end_date_relative    = "8760h"
+}
+`, testAccADServicePrincipalPassword_template(applicationId), value)
 }
diff --git a/website/docs/r/service_principal_password.html.markdown b/website/docs/r/service_principal_password.html.markdown
index 8ad3a5a70..103386d95 100644
--- a/website/docs/r/service_principal_password.html.markdown
+++ b/website/docs/r/service_principal_password.html.markdown
@@ -44,7 +44,11 @@ The following arguments are supported:
 
 * `value` - (Required) The Password for this Service Principal.
 
-* `end_date` - (Required) The End Date which the Password is valid until, formatted as a RFC3339 date string (e.g. `2018-01-01T01:02:03Z`). Changing this field forces a new resource to be created.
+* `end_date` - (Optional) The End Date which the Password is valid until, formatted as a RFC3339 date string (e.g. `2018-01-01T01:02:03Z`). Changing this field forces a new resource to be created.
+
+* `end_date_relative` - (Optional) A relative duration for which the Password is valid until, for example `240h` (10 days) or `2400h30m`. Changing this field forces a new resource to be created.
+
+-> **NOTE:** One of `end_date` or `end_date_relative` must be set.
 
 * `key_id` - (Optional) A GUID used to uniquely identify this Key. If not specified a GUID will be created. Changing this field forces a new resource to be created.