home *** CD-ROM | disk | FTP | other *** search
- package DateTime;
-
- use strict;
-
- require DateTime::LeapSecond;
-
- sub _normalize_tai_seconds
- {
- return if grep { $_ == INFINITY() || $_ == NEG_INFINITY() } @_[1,2];
-
- # This must be after checking for infinity, because it breaks in
- # presence of use integer !
- use integer;
-
- my $adj;
-
- if ( $_[2] < 0 )
- {
- $adj = ( $_[2] - 86399 ) / 86400;
- }
- else
- {
- $adj = $_[2] / 86400;
- }
-
- $_[1] += $adj;
-
- $_[2] -= $adj * 86400;
- }
-
- sub _normalize_leap_seconds
- {
- # args: 0 => days, 1 => seconds
- my $delta_days;
-
- use integer;
-
- # rough adjust - can adjust many days
- if ( $_[2] < 0 )
- {
- $delta_days = ($_[2] - 86399) / 86400;
- }
- else
- {
- $delta_days = $_[2] / 86400;
- }
-
- my $new_day = $_[1] + $delta_days;
- my $delta_seconds = ( 86400 * $delta_days ) +
- DateTime::LeapSecond::leap_seconds( $new_day ) -
- DateTime::LeapSecond::leap_seconds( $_[1] );
-
- $_[2] -= $delta_seconds;
- $_[1] = $new_day;
-
- # fine adjust - up to 1 day
- my $day_length = DateTime::LeapSecond::day_length( $new_day );
- if ( $_[2] >= $day_length )
- {
- $_[2] -= $day_length;
- $_[1]++;
- }
- elsif ( $_[2] < 0 )
- {
- $day_length = DateTime::LeapSecond::day_length( $new_day - 1 );
- $_[2] += $day_length;
- $_[1]--;
- }
- }
-
- 1;
-