From 64f54ab48012f9f6f425640204ac5465aeea091e Mon Sep 17 00:00:00 2001
From: Matthew Grasmick <matt.grasmick@gmail.com>
Date: Tue, 19 Sep 2017 14:29:07 -0400
Subject: [PATCH 1/3] Allowing relative date format.

---
 src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php b/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
index 435e42f2..b390833e 100644
--- a/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
+++ b/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
@@ -2,6 +2,9 @@
 
 namespace Drupal\Driver\Fields\Drupal8;
 
+use function strpos;
+use function substr;
+
 /**
  * Datetime field handler for Drupal 8.
  */
@@ -12,7 +15,14 @@ class DatetimeHandler extends AbstractHandler {
    */
   public function expand($values) {
     foreach ($values as $key => $value) {
-      $values[$key] = str_replace(' ', 'T', $value);
+      if (strpos($value, "relative:") !== FALSE) {
+        $relative = trim(str_replace('relative:', '', $value));
+        // Get time, convert to ISO 8601 date in GMT/UTC, remove time zone offset.
+        $values[$key] = substr(gmdate('c', strtotime($relative)), 0, 19);
+      }
+      else {
+        $values[$key] = str_replace(' ', 'T', $value);
+      }
     }
     return $values;
   }

From 572fdd46a396dcbdb91469995cf404a23a021892 Mon Sep 17 00:00:00 2001
From: Matthew Grasmick <matthew.grasmick@acquia.com>
Date: Tue, 12 Dec 2017 10:47:34 -0500
Subject: [PATCH 2/3] Update DatetimeHandler.php

---
 src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php b/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
index b390833e..78e8ac73 100644
--- a/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
+++ b/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
@@ -2,9 +2,6 @@
 
 namespace Drupal\Driver\Fields\Drupal8;
 
-use function strpos;
-use function substr;
-
 /**
  * Datetime field handler for Drupal 8.
  */

From 97e6e79abba2111cbb65813cb15497cb554715ab Mon Sep 17 00:00:00 2001
From: Matthew Grasmick <matthew.grasmick@acquia.com>
Date: Tue, 12 Dec 2017 14:44:51 -0500
Subject: [PATCH 3/3] Update DatetimeHandler.php

---
 src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php b/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
index 78e8ac73..006db8fc 100644
--- a/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
+++ b/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
@@ -14,7 +14,7 @@ public function expand($values) {
     foreach ($values as $key => $value) {
       if (strpos($value, "relative:") !== FALSE) {
         $relative = trim(str_replace('relative:', '', $value));
-        // Get time, convert to ISO 8601 date in GMT/UTC, remove time zone offset.
+        // Get time, convert to ISO 8601 date in GMT/UTC, remove TZ offset.
         $values[$key] = substr(gmdate('c', strtotime($relative)), 0, 19);
       }
       else {