From 7386ec037e14659d91c925925eaca3866fc75a8a Mon Sep 17 00:00:00 2001
From: Jean-Philippe Lang <jp_lang@yahoo.fr>
Date: Sun, 16 Dec 2018 07:03:47 +0000
Subject: [PATCH] Implement date grouping for MySQL (#13803).

Patch by Marius BALTEANU.

git-svn-id: http://svn.redmine.org/redmine/trunk@17745 e93f8b46-1217-0410-a6f0-8f06a7374b81
---
 lib/redmine/database.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/redmine/database.rb b/lib/redmine/database.rb
index c18470a41..82df4b6a4 100644
--- a/lib/redmine/database.rb
+++ b/lib/redmine/database.rb
@@ -74,6 +74,14 @@ module Redmine
           else
             "#{column}::date"
           end
+        elsif mysql?
+          if time_zone
+            user_identifier = ActiveSupport::TimeZone.find_tzinfo(time_zone.name).identifier
+            local_identifier = ActiveSupport::TimeZone.find_tzinfo(Time.zone.name).identifier
+            "CONVERT_TZ(DATE(#{column}),'#{local_identifier}', '#{user_identifier}')"
+          else
+            "DATE(#{column})"
+          end
         end
       end