[PATCH] tzset.3: add offset format

[JWP <elseifthen-KK0ffGbhmjU@public.gmane.org>]

tzset.3 does not illustrate the POSIX offset format.
Specifically, there is no indication in the manual
what the optional components of it are.

Signed-off-by: J William Piggott <elseifthen-KK0ffGbhmjU@public.gmane.org>
---
 man3/tzset.3 | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/man3/tzset.3 b/man3/tzset.3
index 2bc246c..cfb2d4c 100644
--- a/man3/tzset.3
+++ b/man3/tzset.3
@@ -107,8 +107,12 @@ time to get Coordinated Universal Time (UTC).
 The \fIoffset\fP is positive
 if the local timezone is west of the Prime Meridian and negative if it is
 east.
-The hour must be between 0 and 24, and the minutes and seconds
-0 and 59.
+The hour must be between 0 and 24, and the minutes and seconds 00 and 59:
+.sp
+.RS
+.RI [ + | - ] hh [ :mm [ :ss ]]
+.RE
+.sp
 .PP
 The \fIdst\fP string and \fIoffset\fP specify the name and offset for the
 corresponding daylight saving timezone.
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