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3cfb933344
It wasn't tested and probably never worked, no platform used it, and the latest POSIX no longer allows it. * Makefile (typecheck): Don't check time_t being 'double'. * Theory: Document the change. * difftime.c (difftime): * localtime.c (differ_by_repeat, tzload, timesub, time2sub): * private.h (time_t_min, time_t_max): * zdump.c (absolute_min_time, absolute_max_time, tformat): Don't try to support floating-point time_t. * localtime.c, private.h, zdump.c: Don't include float.h. * localtime.c (truncate_time, double_to_time): * private.h (TYPE_INTEGRAL): * zdump.c (checkabsolutes): Remove; no longer needed. All uses removed. * zdump.8 (LIMITATIONS): Remove discussion of floating-point time_t.
68 lines
1.7 KiB
Groff
68 lines
1.7 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 \-500 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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.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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