From 450600388a176310399ae77f4571b0620abeab91 Mon Sep 17 00:00:00 2001
From: "Rafatjoo, Bahman" <Bahman.Rafatjoo@greenparkresearch.com>
Date: Fri, 18 Nov 2022 13:18:05 +0000
Subject: [PATCH] Fix for Bug in handling cronspecs with 31-day months #30

---
 include/croncpp.h      |  6 ++++++
 test/test_standard.cpp | 17 +++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/croncpp.h b/include/croncpp.h
index 3c7c31c..b0037c0 100644
--- a/include/croncpp.h
+++ b/include/croncpp.h
@@ -563,9 +563,11 @@ namespace cron
          case cron_field::day_of_week:
          case cron_field::day_of_month:
             date.tm_mday += val;
+            date.tm_isdst = -1;
             break;
          case cron_field::month:
             date.tm_mon += val;
+            date.tm_isdst = -1;
             break;
          case cron_field::year:
             date.tm_year += val;
@@ -597,9 +599,11 @@ namespace cron
             break;
          case cron_field::day_of_month:
             date.tm_mday = val;
+            date.tm_isdst = -1;
             break;
          case cron_field::month:
             date.tm_mon = val;
+            date.tm_isdst = -1;
             break;
          case cron_field::year:
             date.tm_year = val;
@@ -630,9 +634,11 @@ namespace cron
             break;
          case cron_field::day_of_month:
             date.tm_mday = 1;
+            date.tm_isdst = -1;
             break;
          case cron_field::month:
             date.tm_mon = 0;
+            date.tm_isdst = -1;
             break;
          case cron_field::year:
             date.tm_year = 0;
diff --git a/test/test_standard.cpp b/test/test_standard.cpp
index 854d3ae..bf181f7 100644
--- a/test/test_standard.cpp
+++ b/test/test_standard.cpp
@@ -417,6 +417,23 @@ TEST_CASE("next", "[std]")
    check_next("0 30 23 30 1/3 ?",  "2010-12-30 00:00:00", "2011-01-30 23:30:00");
    check_next("0 30 23 30 1/3 ?",  "2011-01-30 23:30:00", "2011-04-30 23:30:00");
    check_next("0 30 23 30 1/3 ?",  "2011-04-30 23:30:00", "2011-07-30 23:30:00");
+
+   // Last day of month in and out of DST
+   check_next("0 25 23 31 12 ?",   "2011-09-22 14:20:00", "2011-12-31 23:25:00");
+   check_next("0 25 23 31 12 ?",   "2011-12-31 23:30:00", "2012-12-31 23:25:00");
+   check_next("0 25 23 30 11 ?",   "2011-09-22 14:20:00", "2011-11-30 23:25:00");
+   check_next("0 25 23 30 11 ?",   "2011-10-22 14:20:00", "2011-11-30 23:25:00");
+   check_next("0 25 23 30 11 ?",   "2011-11-22 14:20:00", "2011-11-30 23:25:00");
+   check_next("0 25 23 30 11 ?",   "2011-12-22 14:20:00", "2012-11-30 23:25:00");
+   check_next("0 25 23 31 10 ?",   "2011-09-22 14:20:00", "2011-10-31 23:25:00");
+   check_next("0 25 23 31 10 ?",   "2011-10-22 14:20:00", "2011-10-31 23:25:00");
+   check_next("0 25 23 31 10 ?",   "2011-10-31 23:30:00", "2012-10-31 23:25:00");
+   check_next("0 25 23 31 10 ?",   "2011-11-22 14:20:00", "2012-10-31 23:25:00");
+   check_next("0 25 23 31 8 ?",    "2011-09-22 14:20:00", "2012-08-31 23:25:00");
+   check_next("0 25 23 31 7 ?",    "2011-09-22 14:20:00", "2012-07-31 23:25:00");
+   check_next("0 25 23 30 6 ?",    "2011-09-22 14:20:00", "2012-06-30 23:25:00");
+   check_next("0 25 23 31 5 ?",    "2011-09-22 14:20:00", "2012-05-31 23:25:00");
+   check_next("0 25 23 30 4 ?",    "2011-09-22 14:20:00", "2012-04-30 23:25:00");
 }
 
 TEST_CASE("cronexpr", "[std]")