From: daurnimator <quae@daurnimator.com>
Date: Thu, 15 Aug 2013 22:15:47 +0000 (-0400)
Subject: src/timetable: Normalise out of range months
X-Git-Url: https://git.madduck.net/etc/awesome.git/commitdiff_plain/a74ef4ee5f93ac14d3ee03bf70a78d6a192e351f

src/timetable: Normalise out of range months
---

diff --git a/spec/timetable_spec.lua b/spec/timetable_spec.lua
index 38ded15..9a16af5 100644
--- a/spec/timetable_spec.lua
+++ b/spec/timetable_spec.lua
@@ -49,5 +49,9 @@ describe ( "Time table library" , function ( )
 				assert.same ( native_timestamp ( y,m,1 ) , timetable.timestamp(y,m,1,0,0,0) )
 			end
 		end
-	end)
+	end )
+
+	it ( "Out of range month is normalised" , function ( )
+		assert.same ( { timetable.normalise(2013,0,1,0,0,0) } , { 2012,12,1,0,0,0 } )
+	end )
 end )
diff --git a/src/timetable.lua b/src/timetable.lua
index bacc58c..aef8ca4 100644
--- a/src/timetable.lua
+++ b/src/timetable.lua
@@ -21,6 +21,7 @@ local function year_length ( y )
 end
 
 local function month_length ( m , y )
+	m = ( m - 1 ) % 12 + 1
 	if m == 2 then
 		return is_leap ( y ) and 29 or 28
 	else