Please note that diffs are not public domain; they are subject to the
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===================================================================
RCS file: /ftp/cvs/cvsroot/src/lib/libc/time/zdump.8,v
rcsdiff: /ftp/cvs/cvsroot/src/lib/libc/time/zdump.8,v: warning: Unknown phrases like `commitid ...;' are present.
retrieving revision 1.1.1.3
retrieving revision 1.1.1.4
diff -u -p -r1.1.1.3 -r1.1.1.4
--- src/lib/libc/time/zdump.8	2003/10/29 20:19:04	1.1.1.3
+++ src/lib/libc/time/zdump.8	2009/10/25 16:20:16	1.1.1.4
@@ -10,7 +10,7 @@ zdump \- time zone dumper
 .B \-v
 ] [
 .B \-c
-cutoffyear ] [ zonename ... ]
+[loyear,]hiyear ] [ zonename ... ]
 .SH DESCRIPTION
 .I Zdump
 prints the current time in each
@@ -38,8 +38,22 @@ if the given time is Daylight Saving Tim
 .B isdst=0
 otherwise.
 .TP
-.BI "\-c " cutoffyear
-Cut off the verbose output near the start of the given year.
+.BI "\-c " [loyear,]hiyear
+Cut off verbose output near the start of the given year(s).
+By default,
+the program cuts off verbose output near the starts of the years -500 and 2500.
+.SH LIMITATIONS
+The
+.B \-v
+option may not be used on systems with floating-point time_t values
+that are neither float nor double.
+.PP
+Time discontinuities are found by sampling the results returned by localtime
+at twelve-hour intervals.
+This works in all real-world cases;
+one can construct artificial time zones for which this fails.
 .SH "SEE ALSO"
 newctime(3), tzfile(5), zic(8)
-.\" @(#)zdump.8	7.4
+.\" @(#)zdump.8	8.2
+.\" This file is in the public domain, so clarified as of
+.\" 2009-05-17 by Arthur David Olson.