From 76fe9e893cc123b9651bcf38620794c6095bb11d Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 17 Jan 2011 17:00:36 +0000
Subject: update doc.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30586 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 time.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/time.c b/time.c
index c454abe4fa..e6a02e5440 100644
--- a/time.c
+++ b/time.c
@@ -4362,7 +4362,8 @@ strftimev(const char *fmt, VALUE time)
  *  Format directives:
  *
  *    Date (Year, Month, Day):
- *      %Y - Year with century
+ *      %Y - Year with century (can be negative, 4 digits at least)
+ *              -0001, 0000, 1995, 2009, 14292, etc.
  *      %C - Century (20 in 2009)
  *      %y - Year without a century (00..99)
  *      
@@ -4398,6 +4399,7 @@ strftimev(const char *fmt, VALUE time)
  *              %3N  millisecond (3 digits)
  *              %6N  microsecond (6 digits)
  *              %9N  nanosecond (9 digits)
+ *              %12N picosecond (12 digits)
  *      
  *    Time zone:
  *      %z - Time zone as hour and minute offset from UTC (e.g. +0900)
-- 
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