From 5b1883fcdfff7dfe2d6254cbc33227cb101f0f42 Mon Sep 17 00:00:00 2001
From: Simon Michael <simon@joyful.com>
Date: Fri, 19 Jan 2018 12:45:51 -0800
Subject: [PATCH] bs/bse/cf/is: fix display of abbreviated name for December

---
 hledger-lib/Hledger/Data/Period.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hledger-lib/Hledger/Data/Period.hs b/hledger-lib/Hledger/Data/Period.hs
index a9fc1048d..6cd7bdf99 100644
--- a/hledger-lib/Hledger/Data/Period.hs
+++ b/hledger-lib/Hledger/Data/Period.hs
@@ -147,7 +147,7 @@ showPeriod PeriodAll           = "-"
 -- | Like showPeriod, but if it's a month period show just 
 -- the 3 letter month name abbreviation for the current locale.
 showPeriodMonthAbbrev (MonthPeriod _ m)                           -- Jan
-  | m >= 0 && m < length monthnames = snd $ monthnames !! (m-1)
+  | m > 0 && m <= length monthnames = snd $ monthnames !! (m-1)
   where monthnames = months defaultTimeLocale
 showPeriodMonthAbbrev p = showPeriod p