doc: fix date(1) synopses etc

Font problem reported by Michael Aramini via Alejandro Colomar
<https://bugs.gnu.org/80258>.  This patch also fixes some
longstanding confusion with date synopses.
* src/date.c (usage): Do not imply that only -u can be used with
MMDDhhmm..., and do not put misleading brackets around the latter.

doc/coreutils.texi

@@ -15837,20 +15837,20 @@ Synopses:
 
 @example
 date [@var{option}]@dots{} [+@var{format}]
-date [-u|--utc|--universal] @c this avoids a newline in the output
-[ MMDDhhmm[[CC]YY][.ss] ]
+date [@var{option}]@dots{} @c Avoid a newline in the output.
+@var{mm}@var{dd}@var{hh}@var{mm}[[@var{cc}]@var{yy}][.@var{ss}]
 @end example
 
 The @command{date} command displays the date and time.
 With the @option{--set} (@option{-s}) option, or with
-@samp{MMDDhhmm[[CC]YY][.ss]},
-it sets the date and time.
+@samp{@var{mm}@var{dd}@var{hh}@var{mm}[[@var{cc}]@var{yy}][.@var{ss}]},
+it sets the date and time before displaying it.
 
 @vindex LC_TIME
-Invoking @command{date} with no @var{format} argument is equivalent to invoking
+Invoking @command{date} with no operands is equivalent to invoking
 it with a default format that depends on the @env{LC_TIME} locale category.
-In the default C locale, this format is @samp{'+%a %b %e %H:%M:%S %Z %Y'},
-so the output looks like @samp{Thu Jul @ 9 17:00:00 EDT 2020}.
+In the default C locale, this format is @samp{+%a %b %e %H:%M:%S %Z %Y},
+so the output looks like @samp{Thu Jul @ 9 17:00:00 EDT 2026}.
 
 @vindex TZ
 Normally, @command{date} uses the time zone rules indicated by the
@@ -15878,8 +15878,7 @@ is not set.  @xref{TZ Variable,, Specifying the Time Zone with
 @cindex time formats
 @cindex formatting times
 If given an argument that starts with a @samp{+}, @command{date} prints the
-current date and time (or the date and time specified by the
-@option{--date} option, see below) in the format defined by that argument,
+date and time in the format defined by that argument,
 which is similar to that of the @code{strftime} function.  Except for
 conversion specifiers, which start with @samp{%}, characters in the
 format string are printed unchanged.  The conversion specifiers are
@@ -16283,26 +16282,26 @@ hardware clock may need to be updated from the system clock, which
 might not happen automatically on your system.
 
 To set the clock, you can use the @option{--set} (@option{-s}) option
-(@pxref{Options for date}).  To set the clock without using GNU
-extensions, you can give @command{date} an argument of the form
-@samp{MMDDhhmm[[CC]YY][.ss]} where each two-letter
+(@pxref{Options for date}) or a operand of the form
+@samp{@var{mm}@var{dd}@var{hh}@var{mm}[[@var{cc}]@var{yy}][.@var{ss}]}
+where each two-letter
 component stands for two digits with the following meanings:
 
 @table @var
-@item MM
-month
-@item DD
+@item mm
+month (this is the first @var{mm})
+@item dd
 day within month
 @item hh
 hour
 @item mm
-minute
-@item CC
+minute (this is the second @var{mm})
+@item cc
 first two digits of year (optional)
-@item YY
+@item yy
 last two digits of year (optional)
 @item ss
-second (optional)
+second (optional; this is a GNU extension)
 @end table
 
 The @option{--date} and @option{--set} options may not be used with an

man/date.x

@@ -1,5 +1,11 @@
 [NAME]
 date \- print or set the system date and time
+[SYNOPSIS]
+.B date
+[\fI\,OPTION\/\fR]... [\fB+\fR\fI\,FORMAT\/\fR]
+.br
+.B date
+[\fI\,OPTION\/\fR]... \fIMMDDhhmm\/\fR[[\fI\,CC\/\fR]\fI\,YY\/\fR][\fB.\fI\,ss\/\fR]
 [DESCRIPTION]
 .\" Add any additional description here
 [DATE STRING]

src/date.c

@@ -128,12 +128,12 @@ usage (int status)
     {
       printf (_("\
 Usage: %s [OPTION]... [+FORMAT]\n\
-  or:  %s [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]\n\
+  or:  %s [OPTION]... MMDDhhmm[[CC]YY][.ss]\n\
 "),
               program_name, program_name);
       fputs (_("\
 Display date and time in the given FORMAT.\n\
-With -s, or with [MMDDhhmm[[CC]YY][.ss]], set the date and time.\n\
+With -s, or with MMDDhhmm[[CC]YY][.ss], set the date and time first.\n\
 "), stdout);
 
       emit_mandatory_arg_note ();