From 7cdadc62eac79ee9bd05b6a74d3ddfb96924a439 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Tue, 23 Feb 2010 01:42:19 +0000
Subject: [PATCH] Supress convertion of zero hours to '12' for intervals when
 using to_char with HH, e.g.

	to_char(interval '0d 0h 12m 44s', 'DD HH24 MI SS');

now returns:

	 00 00 12 44

not:

	 00 12 12 44
---
 src/backend/utils/adt/formatting.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/backend/utils/adt/formatting.c b/src/backend/utils/adt/formatting.c
index a3e7f0c76bb..1db285536fe 100644
--- a/src/backend/utils/adt/formatting.c
+++ b/src/backend/utils/adt/formatting.c
@@ -1,7 +1,7 @@
 /* -----------------------------------------------------------------------
  * formatting.c
  *
- * $PostgreSQL: pgsql/src/backend/utils/adt/formatting.c,v 1.163 2010/02/16 21:18:01 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/adt/formatting.c,v 1.164 2010/02/23 01:42:19 momjian Exp $
  *
  *
  *	 Portions Copyright (c) 1999-2010, PostgreSQL Global Development Group
@@ -2089,8 +2089,8 @@ DCH_to_char(FormatNode *node, bool is_interval, TmToChar *in, char *out)
 			case DCH_HH:
 			case DCH_HH12:
 				sprintf(s, "%0*d", S_FM(n->suffix) ? 0 : 2,
-						tm->tm_hour % (HOURS_PER_DAY / 2) == 0 ? 12 :
-						tm->tm_hour % (HOURS_PER_DAY / 2));
+						!is_interval && tm->tm_hour % (HOURS_PER_DAY / 2) == 0 ?
+						12 : tm->tm_hour % (HOURS_PER_DAY / 2));
 				if (S_THth(n->suffix))
 					str_numth(s, s, S_TH_TYPE(n->suffix));
 				s += strlen(s);
-- 
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