From 88f50a50cf418810a28fa12fca16c251827ae736 Mon Sep 17 00:00:00 2001
From: Radek Simko <radek.simko@gmail.com>
Date: Sun, 10 Mar 2019 18:34:46 +0000
Subject: [PATCH] resource/pagerduty_maintenance_window: Suppress spurious diff

---
 .../resource_pagerduty_maintenance_window.go      | 14 ++++++++------
 pagerduty/util.go                                 | 15 +++++++++++++++
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/pagerduty/resource_pagerduty_maintenance_window.go b/pagerduty/resource_pagerduty_maintenance_window.go
index c493f2f68..77087c67e 100644
--- a/pagerduty/resource_pagerduty_maintenance_window.go
+++ b/pagerduty/resource_pagerduty_maintenance_window.go
@@ -18,14 +18,16 @@ func resourcePagerDutyMaintenanceWindow() *schema.Resource {
 		},
 		Schema: map[string]*schema.Schema{
 			"start_time": {
-				Type:         schema.TypeString,
-				Required:     true,
-				ValidateFunc: validateRFC3339,
+				Type:             schema.TypeString,
+				Required:         true,
+				ValidateFunc:     validateRFC3339,
+				DiffSuppressFunc: suppressRFC3339Diff,
 			},
 			"end_time": {
-				Type:         schema.TypeString,
-				Required:     true,
-				ValidateFunc: validateRFC3339,
+				Type:             schema.TypeString,
+				Required:         true,
+				ValidateFunc:     validateRFC3339,
+				DiffSuppressFunc: suppressRFC3339Diff,
 			},
 
 			"services": {
diff --git a/pagerduty/util.go b/pagerduty/util.go
index bcb1fafe9..c4fac1b68 100644
--- a/pagerduty/util.go
+++ b/pagerduty/util.go
@@ -2,6 +2,7 @@ package pagerduty
 
 import (
 	"fmt"
+	"log"
 	"time"
 
 	"github.com/hashicorp/terraform/helper/schema"
@@ -26,6 +27,20 @@ func validateRFC3339(v interface{}, k string) (we []string, errors []error) {
 	return
 }
 
+func suppressRFC3339Diff(k, oldTime, newTime string, d *schema.ResourceData) bool {
+	oldT, err := time.Parse(time.RFC3339, oldTime)
+	if err != nil {
+		log.Printf("[ERROR] Failed to parse %q (old %q). Expected format: %s (RFC3339)", oldTime, k, time.RFC3339)
+		return false
+	}
+	newT, err := time.Parse(time.RFC3339, newTime)
+	if err != nil {
+		log.Printf("[ERROR] Failed to parse %q (new %q). Expected format: %s (RFC3339)", newTime, k, time.RFC3339)
+		return false
+	}
+	return oldT.Equal(newT)
+}
+
 // Validate a value against a set of possible values
 func validateValueFunc(values []string) schema.SchemaValidateFunc {
 	return func(v interface{}, k string) (we []string, errors []error) {