luatz/timetable.lua: Fix incorrect normalisation logic for negative day field

[etc/awesome.git] / luatz / timetable.lua

diff --git a/luatz/timetable.lua b/luatz/timetable.lua
index 0dbf4c8eedb5d6fdce95d0f80187ef08e1363de0..6bae913470bbd151ea4f2384210b448391f2547e 100644 (file)
--- a/luatz/timetable.lua
+++ b/luatz/timetable.lua
@@ -107,8 +107,12 @@ local function normalise ( year , month , day , hour , min , sec )
        -- Add a whole year of days at a time, this is later resolved by adding months
        -- TODO[OPTIMIZE]: This could be slow if `day` is far out of range
        while day < 0 do
-               year = year - 1
-               day  = day + year_length ( year )
+               month = month - 1
+               if month < 0 then
+                       year = year - 1
+                       month = 11
+               end
+               day = day + month_length ( month + 1 , year )
        end
        year , month = carry ( year , month , 12 )