From 62345ef4da075f16c9dbe79d8962e26f2d0d8dd7 Mon Sep 17 00:00:00 2001
From: mattkibbler <mattkibbler@gmail.com>
Date: Mon, 17 Aug 2015 18:48:58 +0100
Subject: [PATCH] Allow start and end date of DATEDIF function to be the same

---
 src/PhpSpreadsheet/Calculation/DateTime.php | 2 +-
 tests/data/Calculation/DateTime/DATEDIF.php | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/PhpSpreadsheet/Calculation/DateTime.php b/src/PhpSpreadsheet/Calculation/DateTime.php
index e042b15c..16164814 100644
--- a/src/PhpSpreadsheet/Calculation/DateTime.php
+++ b/src/PhpSpreadsheet/Calculation/DateTime.php
@@ -664,7 +664,7 @@ class DateTime
         }
 
         // Validate parameters
-        if ($startDate >= $endDate) {
+        if ($startDate > $endDate) {
             return Functions::NAN();
         }
 
diff --git a/tests/data/Calculation/DateTime/DATEDIF.php b/tests/data/Calculation/DateTime/DATEDIF.php
index 4e2288c6..de397956 100644
--- a/tests/data/Calculation/DateTime/DATEDIF.php
+++ b/tests/data/Calculation/DateTime/DATEDIF.php
@@ -607,4 +607,10 @@ return [
         'Y',
         50,
     ],
+    [
+        '1982-12-07',
+        '1982-12-7',
+        'D',
+        0,
+    ],
 ];