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-rw-r--r--zic.813
1 files changed, 10 insertions, 3 deletions
diff --git a/zic.8 b/zic.8
index ea7bab9..a0a9743 100644
--- a/zic.8
+++ b/zic.8
@@ -122,7 +122,7 @@ is
any already-existing link is removed.
.TP
.BR "\*-r " "[\fB@\fP\fIlo\fP][\fB/@\fP\fIhi\fP]"
-Reduce the size of output files by limiting their applicability
+Limit the applicability of output files
to timestamps in the range from
.I lo
(inclusive) to
@@ -134,6 +134,10 @@ and
are possibly-signed decimal counts of seconds since the Epoch
(1970-01-01 00:00:00 UTC).
Omitted counts default to extreme values.
+The output files use UT offset 0 and abbreviation
+.q "\*-00"
+in place of the omitted timestamp data;
+this typically reduces the files' sizes.
For example,
.q "zic \*-r @0"
omits data intended for negative timestamps (i.e., before the Epoch), and
@@ -523,8 +527,8 @@ begin the field with a minus sign if time must be subtracted from UT.
.B RULES
The name of the rules that apply in the timezone or,
alternatively, a field in the same format as a rule-line SAVE column,
-giving of the amount of time to be added to local standard time
-effect, and whether the resulting time is standard or daylight saving.
+giving the amount of time to be added to local standard time
+and whether the resulting time is standard or daylight saving.
If this field is
.B \*-
then standard time always applies.
@@ -559,6 +563,9 @@ alphanumeric ASCII characters,
.q "+"
and
.q "\*-".
+By convention, the time zone abbreviation
+.q "\*-00"
+is a placeholder that means local time is unspecified.
.TP
.B UNTIL
The time at which the UT offset or the rule(s) change for a location.