X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/7c0587c85ff56c1fa1d95bc5228a7aff2da43d6c..94442a1e2340da119f9f259694bde40ead3803a8:/lib/timelocal.pl

diff --git a/lib/timelocal.pl b/lib/timelocal.pl
index 5be3840..ad32275 100644
--- a/lib/timelocal.pl
+++ b/lib/timelocal.pl
@@ -4,76 +4,15 @@
 ;#	$time = timelocal($sec,$min,$hours,$mday,$mon,$year);
 ;#	$time = timegm($sec,$min,$hours,$mday,$mon,$year);
 
-;# 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
-;# themselves are guessed by successive approximation starting at the
-;# current time, since most dates seen in practice are close to the
-;# current date.  Unlike algorithms that do a binary search (calling gmtime
-;# once for each bit of the time value, resulting in 32 calls), this algorithm
-;# calls it at most 6 times, and usually only once or twice.  If you hit
-;# the month cache, of course, it doesn't call it at all.
+;# This file has been superseded by the Time::Local library module.
+;# It is implemented as a call to that module for backwards compatibility
+;# with code written for perl4; new code should use Time::Local directly.
 
-;# 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.  The timezone is determined by examining
-;# the result of localtime(0) when the package is initialized.  The daylight
-;# savings offset is currently assumed to be one hour.
+;# The current implementation shares with the original the questionable
+;# behavior of defining the timelocal() and timegm() functions in the
+;# namespace of whatever package was current when the first instance of
+;# C<require 'timelocal.pl';> was executed in a program.
 
-CONFIG: {
-    package timelocal;
-    
-    local($[) = 0;
-    @epoch = localtime(0);
-    $tzmin = $epoch[2] * 60 + $epoch[1];	# minutes east of GMT
-    if ($tzmin > 0) {
-	$tzmin = 24 * 60 - $tzmin;		# minutes west of GMT
-	$tzmin -= 24 * 60 if $epoch[5] == 70;	# account for the date line
-    }
+use Time::Local;
 
-    $SEC = 1;
-    $MIN = 60 * $SEC;
-    $HR = 60 * $MIN;
-    $DAYS = 24 * $HR;
-}
-
-sub timegm {
-    package timelocal;
-
-    local($[) = 0;
-    $ym = pack(C2, @_[5,4]);
-    $cheat = $cheat{$ym} || &cheat;
-    $cheat + $_[0] * $SEC + $_[1] * $MIN + $_[2] * $HR + ($_[3]-1) * $DAYS;
-}
-
-sub timelocal {
-    package timelocal;
-
-    local($[) = 0;
-    $time = &main'timegm + $tzmin*$MIN;
-    @test = localtime($time);
-    $time -= $HR if $test[2] != $_[2];
-    $time;
-}
-
-package timelocal;
-
-sub cheat {
-    $year = $_[5];
-    $month = $_[4];
-    die "Month out of range 0..11 in ctime.pl\n" if $month > 11;
-    $guess = $^T;
-    @g = gmtime($guess);
-    while ($diff = $year - $g[5]) {
-	$guess += $diff * (363 * $DAYS);
-	@g = gmtime($guess);
-    }
-    while ($diff = $month - $g[4]) {
-	$guess += $diff * (27 * $DAYS);
-	@g = gmtime($guess);
-    }
-    $g[3]--;
-    $guess -= $g[0] * $SEC + $g[1] * $MIN + $g[2] * $HR + $g[3] * $DAYS;
-    $cheat{$ym} = $guess;
-}
+*timelocal::cheat = \&Time::Local::cheat;