hwclock.c, hwclock.8.in: new --show format

* hwclock.c: change --get and --show functions to the ISO 8601
  format and concatenate fractional seconds to the time display.

* hwclock.8.in: document this.

Signed-off-by: J William Piggott <elseifthen@gmx.com>

2 files changed, 12 insertions, 13 deletions

diff --git a/sys-utils/hwclock.8.in b/sys-utils/hwclock.8.in
index d72b7a8ee..eddb8647f 100644
--- a/sys-utils/hwclock.8.in
+++ b/sys-utils/hwclock.8.in
@@ -88,16 +88,14 @@ command, such as \%'11\ minute\ mode' or from dual-booting another OS.
 .TQ
 .B \-\-get
 .br
-Read the Hardware Clock and print the time on standard output.
+Read the Hardware Clock and print its time to standard output in the
+.B ISO 8601
+format.
 The time shown is always in local time, even if you keep your Hardware Clock
 in UTC.  See the
 .B \%\-\-localtime
 option.
 .sp
-The time shown is in same format as that of 
-.BR \%date (1)
-by default, and additionally, the number of microseconds is shown.
-.sp 
 Showing the Hardware Clock time is the default when no function is specified.
 .sp
 The
diff --git a/sys-utils/hwclock.c b/sys-utils/hwclock.c
index f50739b50..21e0d1b6a 100644
--- a/sys-utils/hwclock.c
+++ b/sys-utils/hwclock.c
@@ -687,14 +687,15 @@ display_time(const bool hclock_valid, struct timeval hwctime)
 		       "either invalid (e.g. 50th day of month) or beyond the range "
 		       "we can handle (e.g. Year 2095)."));
 	else {
-		struct tm *lt;
-		char *format = "%c";
-		char ctime_now[200];
-
-		lt = localtime(&hwctime.tv_sec);
-		strftime(ctime_now, sizeof(ctime_now), format, lt);
-		printf(_("%s and %06ld microseconds\n"),
-		       ctime_now, (long)hwctime.tv_usec);
+		struct tm lt;
+		int zhour, zmin;
+
+		lt = *localtime(&hwctime.tv_sec);
+		zhour = - timezone / 60 / 60;
+		zmin = abs(timezone / 60 % 60);
+		printf(_("%4d-%.2d-%.2d %02d:%02d:%02d.%06ld%+02d:%02d\n"),
+		       lt.tm_year + 1900, lt.tm_mon + 1, lt.tm_mday, lt.tm_hour,
+		       lt.tm_min, lt.tm_sec, (long)hwctime.tv_usec, zhour, zmin);
 	}
 }