From: daurnimator <quae@daurnimator.com>
Date: Wed, 24 Jul 2013 15:52:27 +0000 (-0400)
Subject: src/timetable: Break out leap_years_since function from doomsday
X-Git-Url: https://git.madduck.net/etc/awesome.git/commitdiff_plain/abb29b0b113102a7dea3e4691a853ee20e30f614?hp=d535197d4d94122f86a485aac740bc7329664129

src/timetable: Break out leap_years_since function from doomsday
---

diff --git a/src/timetable.lua b/src/timetable.lua
index c71c59b..b58ad0f 100644
--- a/src/timetable.lua
+++ b/src/timetable.lua
@@ -27,9 +27,13 @@ local function month_length ( m , y )
 	end
 end
 
+local function leap_years_since ( year )
+	return idiv ( year , 4 ) - idiv ( year , 100 ) + idiv ( year , 400 )
+end
+
 local function doomsday ( year )
 	return ( 3 -- Tuesday
-		- 1 + year + idiv ( year , 4 ) - idiv ( year , 100 ) + idiv ( year , 400 ) )
+		- 1 + year + leap_years_since ( year ) )
 		% 7 + 1
 end
 local doomsday_cache = setmetatable ( { } , {