From 69be5e3f08698f9d48d943f2ed48e70b79dde533 Mon Sep 17 00:00:00 2001
From: Glenn Randers-Pehrson <glennrp@gmail.com>
Date: Thu, 3 Aug 2017 22:32:19 -0400
Subject: [PATCH] handle short months in PNG tIME chunk generation

---
 coders/png.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/coders/png.c b/coders/png.c
index 0a5a60455..150e0f0aa 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -8193,8 +8193,10 @@ static void write_tIME_chunk(Image *image,png_struct *ping,png_info *info,
       {
          ptime.hour = 0;
          ptime.day ++;
-         /* To do: fix this for short months */
-         if (ptime.day > 31)
+         /* To do: fix this for leap years */
+         if (ptime.day > 31 || (ptime.month == 2 && ptime.day > 28) ||
+             ((ptime.month == 4 || ptime.month == 6 || ptime.month == 9 ||
+             ptime.month == 11) && ptime.day > 30))
          {
             ptime.day = 1;
             ptime.month++;
-- 
2.50.1