doc: note date's %k, %l are space-padded and equivalent to %_H and %_I

* src/date.c (usage): As above, for --help.
* doc/coreutils.texi (Time conversion specifiers): Likewise.
Reported by Britton Leo Kerin in http://bugs.debian.org/115833.

3 files changed, 5 insertions, 4 deletions

diff --git a/THANKS.in b/THANKS.in
index 2979d52ce..87c5b19b6 100644
--- a/THANKS.in
+++ b/THANKS.in
@@ -92,6 +92,7 @@ Brian Kimball                       bfk@footbag.org
 Brian M. Carlson                    sandals@crustytoothpaste.ath.cx
 Brian Silverman                     bsilverman@conceptxdesign.com
 Brian Youmans                       3diff@gnu.org
+Britton Leo Kerin                   fsblk@aurora.uaf.edu
 Bruce Robertson                     brucer@theodolite.dyndns.org
 Carl Johnson                        carlj@cjlinux.home.org
 Carl Lowenstein                     cdl@mpl.UCSD.EDU
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index c59af2f47..11ac7fd8a 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -13921,10 +13921,10 @@ hour (@samp{00}@dots{}@samp{23})
 @item %I
 hour (@samp{01}@dots{}@samp{12})
 @item %k
-hour (@samp{ 0}@dots{}@samp{23}).
+hour, space padded (@samp{ 0}@dots{}@samp{23}); equivalent to @samp{%_H}.
 This is a @acronym{GNU} extension.
 @item %l
-hour (@samp{ 1}@dots{}@samp{12}).
+hour, space padded (@samp{ 1}@dots{}@samp{12}); equivalent to @samp{%_I}.
 This is a @acronym{GNU} extension.
 @item %M
 minute (@samp{00}@dots{}@samp{59})
diff --git a/src/date.c b/src/date.c
index 6439d165a..755736ab6 100644
--- a/src/date.c
+++ b/src/date.c
@@ -179,8 +179,8 @@ FORMAT controls the output.  Interpreted sequences are:\n\
   %j   day of year (001..366)\n\
 "), stdout);
       fputs (_("\
-  %k   hour ( 0..23)\n\
-  %l   hour ( 1..12)\n\
+  %k   hour, space padded ( 0..23); same as %_H\n\
+  %l   hour, space padded ( 1..12); same as %_I\n\
   %m   month (01..12)\n\
   %M   minute (00..59)\n\
 "), stdout);