diff options
Diffstat (limited to 'usr.sbin/zic/zdump.8')
| -rw-r--r-- | usr.sbin/zic/zdump.8 | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/usr.sbin/zic/zdump.8 b/usr.sbin/zic/zdump.8 index 3a685fd7ea0d..a7f09787dec4 100644 --- a/usr.sbin/zic/zdump.8 +++ b/usr.sbin/zic/zdump.8 @@ -12,7 +12,7 @@ .Nm .Op Fl -version .Op Fl v -.Op Fl c Ar cutoffyear +.Op Fl c Ar [loyear,]hiyear .Op Ar zonename ... .Sh DESCRIPTION The @@ -40,9 +40,21 @@ Each line ends with if the given time is Daylight Saving Time or .Em isdst=0 otherwise. -.It Fl c Ar cutoffyear -Cut off the verbose output near the start of the given year. +.It Fl c Ar 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. .El +.Sh LIMITATIONS +The +.Fl 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" .Xr ctime 3 , .Xr tzfile 5 , |