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-package Time::Local;
-
-require Exporter;
-use Carp;
-use Config;
-use strict;
-use integer;
-
-use vars qw( $VERSION @ISA @EXPORT @EXPORT_OK );
-$VERSION = '1.11';
-$VERSION = eval $VERSION;
-@ISA = qw( Exporter );
-@EXPORT = qw( timegm timelocal );
-@EXPORT_OK = qw( timegm_nocheck timelocal_nocheck );
-
-my @MonthDays = (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
-
-# Determine breakpoint for rolling century
-my $ThisYear = (localtime())[5];
-my $Breakpoint = ($ThisYear + 50) % 100;
-my $NextCentury = $ThisYear - $ThisYear % 100;
- $NextCentury += 100 if $Breakpoint < 50;
-my $Century = $NextCentury - 100;
-my $SecOff = 0;
-
-my (%Options, %Cheat, %Min, %Max);
-my ($MinInt, $MaxInt);
-
-if ($^O eq 'MacOS') {
- # time_t is unsigned...
- $MaxInt = (1 << (8 * $Config{intsize})) - 1;
- $MinInt = 0;
-} else {
- $MaxInt = ((1 << (8 * $Config{intsize} - 2))-1)*2 + 1;
- $MinInt = -$MaxInt - 1;
-
- # On Win32 (and others?) time_t appears to be signed, but negative
- # epochs still don't work. - XXX - this is experimental
- $MinInt = 0
- unless defined ((localtime(-1))[0]);
-}
-
-$Max{Day} = ($MaxInt >> 1) / 43200;
-$Min{Day} = $MinInt ? -($Max{Day} + 1) : 0;
-
-$Max{Sec} = $MaxInt - 86400 * $Max{Day};
-$Min{Sec} = $MinInt - 86400 * $Min{Day};
-
-# Determine the EPOC day for this machine
-my $Epoc = 0;
-if ($^O eq 'vos') {
-# work around posix-977 -- VOS doesn't handle dates in
-# the range 1970-1980.
- $Epoc = _daygm((0, 0, 0, 1, 0, 70, 4, 0));
-}
-elsif ($^O eq 'MacOS') {
- no integer;
-
- # MacOS time() is seconds since 1 Jan 1904, localtime
- # so we need to calculate an offset to apply later
- $Epoc = 693901;
- $SecOff = timelocal(localtime(0)) - timelocal(gmtime(0));
- $Epoc += _daygm(gmtime(0));
-}
-else {
- $Epoc = _daygm(gmtime(0));
-}
-
-%Cheat=(); # clear the cache as epoc has changed
-
-sub _daygm {
- $_[3] + ($Cheat{pack("ss",@_[4,5])} ||= do {
- my $month = ($_[4] + 10) % 12;
- my $year = $_[5] + 1900 - $month/10;
- 365*$year + $year/4 - $year/100 + $year/400 + ($month*306 + 5)/10 - $Epoc
- });
-}
-
-
-sub _timegm {
- my $sec = $SecOff + $_[0] + 60 * $_[1] + 3600 * $_[2];
-
- no integer;
-
- $sec + 86400 * &_daygm;
-}
-
-
-sub _zoneadjust {
- my ($day, $sec, $time) = @_;
-
- $sec = $sec + _timegm(localtime($time)) - $time;
- if ($sec >= 86400) { $day++; $sec -= 86400; }
- if ($sec < 0) { $day--; $sec += 86400; }
-
- ($day, $sec);
-}
-
-
-sub timegm {
- my ($sec,$min,$hour,$mday,$month,$year) = @_;
-
- if ($year >= 1000) {
- $year -= 1900;
- }
- elsif ($year < 100 and $year >= 0) {
- $year += ($year > $Breakpoint) ? $Century : $NextCentury;
- }
-
- unless ($Options{no_range_check}) {
- if (abs($year) >= 0x7fff) {
- $year += 1900;
- croak "Cannot handle date ($sec, $min, $hour, $mday, $month, *$year*)";
- }
-
- croak "Month '$month' out of range 0..11" if $month > 11 or $month < 0;
-
- my $md = $MonthDays[$month];
-# ++$md if $month == 1 and $year % 4 == 0 and
-# ($year % 100 != 0 or ($year + 1900) % 400 == 0);
- ++$md unless $month != 1 or $year % 4 or !($year % 400);
-
- croak "Day '$mday' out of range 1..$md" if $mday > $md or $mday < 1;
- croak "Hour '$hour' out of range 0..23" if $hour > 23 or $hour < 0;
- croak "Minute '$min' out of range 0..59" if $min > 59 or $min < 0;
- croak "Second '$sec' out of range 0..59" if $sec > 59 or $sec < 0;
- }
-
- my $days = _daygm(undef, undef, undef, $mday, $month, $year);
- my $xsec = $sec + $SecOff + 60*$min + 3600*$hour;
-
- unless ($Options{no_range_check}
- or ($days > $Min{Day} or $days == $Min{Day} and $xsec >= $Min{Sec})
- and ($days < $Max{Day} or $days == $Max{Day} and $xsec <= $Max{Sec}))
- {
- warn "Day too small - $days > $Min{Day}\n" if $days < $Min{Day};
- warn "Day too big - $days > $Max{Day}\n" if $days > $Max{Day};
- warn "Sec too small - $days < $Min{Sec}\n" if $days < $Min{Sec};
- warn "Sec too big - $days > $Max{Sec}\n" if $days > $Max{Sec};
- $year += 1900;
- croak "Cannot handle date ($sec, $min, $hour, $mday, $month, $year)";
- }
-
- no integer;
-
- $xsec + 86400 * $days;
-}
-
-
-sub timegm_nocheck {
- local $Options{no_range_check} = 1;
- &timegm;
-}
-
-
-sub timelocal {
- # Adjust Max/Min allowed times to fit local time zone and call timegm
- local ($Max{Day}, $Max{Sec}) = _zoneadjust($Max{Day}, $Max{Sec}, $MaxInt);
- local ($Min{Day}, $Min{Sec}) = _zoneadjust($Min{Day}, $Min{Sec}, $MinInt);
- my $ref_t = &timegm;
-
- # Calculate first guess with a one-day delta to avoid localtime overflow
- my $delta = ($_[5] < 100)? 86400 : -86400;
- my $loc_t = _timegm(localtime( $ref_t + $delta )) - $delta;
-
- # Is there a timezone offset from GMT or are we done
- my $zone_off = $ref_t - $loc_t
- or return $loc_t;
-
- # This hack is needed to always pick the first matching time
- # during a DST change when time would otherwise be ambiguous
- $zone_off -= 3600 if ($delta > 0 && $ref_t >= 3600);
-
- # Adjust for timezone
- $loc_t = $ref_t + $zone_off;
-
- # Are we close to a DST change or are we done
- my $dst_off = $ref_t - _timegm(localtime($loc_t))
- or return $loc_t;
-
- # Adjust for DST change
- $loc_t += $dst_off;
-
- return $loc_t if $dst_off >= 0;
-
- # for a negative offset from GMT, and if the original date
- # was a non-extent gap in a forward DST jump, we should
- # now have the wrong answer - undo the DST adjust;
-
- my ($s,$m,$h) = localtime($loc_t);
- $loc_t -= $dst_off if $s != $_[0] || $m != $_[1] || $h != $_[2];
-
- $loc_t;
-}
-
-
-sub timelocal_nocheck {
- local $Options{no_range_check} = 1;
- &timelocal;
-}
-
-1;
-
-__END__
-
-=head1 NAME
-
-Time::Local - efficiently compute time from local and GMT time
-
-=head1 SYNOPSIS
-
- $time = timelocal($sec,$min,$hour,$mday,$mon,$year);
- $time = timegm($sec,$min,$hour,$mday,$mon,$year);
-
-=head1 DESCRIPTION
-
-These routines are the inverse of built-in perl functions localtime()
-and gmtime(). They accept a date as a six-element array, and return
-the corresponding time(2) value in seconds since the system epoch
-(Midnight, January 1, 1970 GMT on Unix, for example). This value can
-be positive or negative, though POSIX only requires support for
-positive values, so dates before the system's epoch may not work on
-all operating systems.
-
-It is worth drawing particular attention to the expected ranges for
-the values provided. The value for the day of the month is the actual day
-(ie 1..31), while the month is the number of months since January (0..11).
-This is consistent with the values returned from localtime() and gmtime().
-
-The timelocal() and timegm() functions perform range checking on the
-input $sec, $min, $hour, $mday, and $mon values by default. If you'd
-rather they didn't, you can explicitly import the timelocal_nocheck()
-and timegm_nocheck() functions.
-
- use Time::Local 'timelocal_nocheck';
-
- {
- # The 365th day of 1999
- print scalar localtime timelocal_nocheck 0,0,0,365,0,99;
-
- # The twenty thousandth day since 1970
- print scalar localtime timelocal_nocheck 0,0,0,20000,0,70;
-
- # And even the 10,000,000th second since 1999!
- print scalar localtime timelocal_nocheck 10000000,0,0,1,0,99;
- }
-
-Your mileage may vary when trying these with minutes and hours,
-and it doesn't work at all for months.
-
-Strictly speaking, the year should also be specified in a form consistent
-with localtime(), i.e. the offset from 1900.
-In order to make the interpretation of the year easier for humans,
-however, who are more accustomed to seeing years as two-digit or four-digit
-values, the following conventions are followed:
-
-=over 4
-
-=item *
-
-Years greater than 999 are interpreted as being the actual year,
-rather than the offset from 1900. Thus, 1964 would indicate the year
-Martin Luther King won the Nobel prize, not the year 3864.
-
-=item *
-
-Years in the range 100..999 are interpreted as offset from 1900,
-so that 112 indicates 2012. This rule also applies to years less than zero
-(but see note below regarding date range).
-
-=item *
-
-Years in the range 0..99 are interpreted as shorthand for years in the
-rolling "current century," defined as 50 years on either side of the current
-year. Thus, today, in 1999, 0 would refer to 2000, and 45 to 2045,
-but 55 would refer to 1955. Twenty years from now, 55 would instead refer
-to 2055. This is messy, but matches the way people currently think about
-two digit dates. Whenever possible, use an absolute four digit year instead.
-
-=back
-
-The scheme above allows interpretation of a wide range of dates, particularly
-if 4-digit years are used.
-
-Please note, however, that the range of dates that can be actually be handled
-depends on the size of an integer (time_t) on a given platform.
-Currently, this is 32 bits for most systems, yielding an approximate range
-from Dec 1901 to Jan 2038.
-
-Both timelocal() and timegm() croak if given dates outside the supported
-range.
-
-=head2 Ambiguous Local Times (DST)
-
-Because of DST changes, there are many time zones where the same local
-time occurs for two different GMT times on the same day. For example,
-in the "Europe/Paris" time zone, the local time of 2001-10-28 02:30:00
-can represent either 2001-10-28 00:30:00 GMT, B<or> 2001-10-28
-01:30:00 GMT.
-
-When given an ambiguous local time, the timelocal() function should
-always return the epoch for the I<earlier> of the two possible GMT
-times.
-
-=head2 Non-Existent Local Times (DST)
-
-When a DST change causes a locale clock to skip one hour forward,
-there will be an hour's worth of local times that don't exist. Again,
-for the "Europe/Paris" time zone, the local clock jumped from
-2001-03-25 01:59:59 to 2001-03-25 03:00:00.
-
-If the timelocal() function is given a non-existent local time, it
-will simply return an epoch value for the time one hour later.
-
-=head2 Negative Epoch Values
-
-Negative epoch (time_t) values are not officially supported by the
-POSIX standards, so this module's tests do not test them. On some
-systems, they are known not to work. These include MacOS (pre-OSX)
-and Win32.
-
-On systems which do support negative epoch values, this module should
-be able to cope with dates before the start of the epoch, down the
-minimum value of time_t for the system.
-
-=head1 IMPLEMENTATION
-
-These routines are quite efficient and yet are always guaranteed to agree
-with localtime() and gmtime(). We manage this by caching the start times
-of any months we've seen before. If we know the start time of the month,
-we can always calculate any time within the month. The start times
-are calculated using a mathematical formula. Unlike other algorithms
-that do multiple calls to gmtime().
-
-timelocal() is implemented using the same cache. We just assume that we're
-translating a GMT time, and then fudge it when we're done for the timezone
-and daylight savings arguments. Note that the timezone is evaluated for
-each date because countries occasionally change their official timezones.
-Assuming that localtime() corrects for these changes, this routine will
-also be correct.
-
-=head1 BUGS
-
-The whole scheme for interpreting two-digit years can be considered a bug.
-
-=head1 SUPPORT
-
-Support for this module is provided via the datetime@perl.org
-email list. See http://lists.perl.org/ for more details.
-
-Please submit bugs using the RT system at rt.cpan.org, or as a last
-resort, to the datetime@perl.org list.
-
-=head1 AUTHOR
-
-This module is based on a Perl 4 library, timelocal.pl, that was
-included with Perl 4.036, and was most likely written by Tom
-Christiansen.
-
-The current version was written by Graham Barr.
-
-It is now being maintained separately from the Perl core by Dave
-Rolsky, <autarch@urth.org>.
-
-=cut
-