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a577b388f3
Most of this patch is to commentary, to distinguish better among the similar characters hyphen '-', minus sign '−', en dash '–' (used for ranges), and em dash '—'. Render ordinary dashes in text as spaced en dashes, as this gives better-looking results in monospaced fonts. * yearistype.sh, zic.c: Reword diagnostics so that they do not use hyphens as if they were dashes. Since we are sticking to ASCII in programs, we can't use proper dashes in diagnostics.
77 lines
2.0 KiB
Groff
77 lines
2.0 KiB
Groff
.TH ZDUMP 8
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.SH NAME
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zdump \- time zone dumper
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.SH SYNOPSIS
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.B zdump
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[
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.B \-\-version
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] [
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.B \-v
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] [
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.B \-V
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] [
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.B \-c
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[loyear,]hiyear ] [
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.B \-t
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[lotime,]hitime ] [ zonename ... ]
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.SH DESCRIPTION
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.I Zdump
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prints the current time in each
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.I zonename
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named on the command line.
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.PP
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These options are available:
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.TP
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.BI "\-\-version"
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Output version information and exit.
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.TP
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.B \-v
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For each
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.I zonename
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on the command line,
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print the time at the lowest possible time value,
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the time one day after the lowest possible time value,
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the times both one second before and exactly at
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each detected time discontinuity,
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the time at one day less than the highest possible time value,
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and the time at the highest possible time value,
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Each line ends with
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.B isdst=1
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if the given time is Daylight Saving Time or
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.B isdst=0
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otherwise.
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.TP
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.B \-V
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Like
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.BR \-v ,
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except omit the times relative to the extreme time values.
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This generates output that is easier to compare to that of
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implementations with different time representations.
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.TP
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.BI "\-c " [loyear,]hiyear
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Cut off verbose output near the start of the given year(s).
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By default,
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the program cuts off verbose output near the starts of the years
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\(mi500 and 2500.
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.TP
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.BI "\-t " [lotime,]hitime
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Cut off verbose output at the start of the given time(s),
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given in decimal seconds since 1970-01-01 00:00:00 UTC.
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.SH LIMITATIONS
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Time discontinuities are found by sampling the results returned by localtime
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at twelve-hour intervals.
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This works in all real-world cases;
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one can construct artificial time zones for which this fails.
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.PP
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In the output, "UT" denotes the value returned by
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.IR gmtime (3),
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which uses UTC for modern time stamps and some other UT flavor for
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time stamps that predate the introduction of UTC.
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No attempt is currently made to have the output use "UTC" for newer
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and "UT" for older time stamps,
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partly because the exact date of the introduction of UTC is problematic.
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.SH "SEE ALSO"
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newctime(3), tzfile(5), zic(8)
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.\" This file is in the public domain, so clarified as of
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.\" 2009-05-17 by Arthur David Olson.
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