58 lines
1.3 KiB
Groff
58 lines
1.3 KiB
Groff
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.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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[
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.B \-v
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] [
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.B \-c
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[loyear,]hiyear ] [ 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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.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 -500 and 2500.
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.SH LIMITATIONS
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The
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.B \-v
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option may not be used on systems with floating-point time_t values
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that are neither float nor double.
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.PP
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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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.SH "SEE ALSO"
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newctime(3), tzfile(5), zic(8)
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.\" @(#)zdump.8 7.7
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