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package DateTime::Format::Epoch::TAI64;
use strict;
use vars qw($VERSION @ISA);
$VERSION = '0.13';
use DateTime;
use DateTime::Format::Epoch;
use Params::Validate qw/validate/;
use Math::BigInt ('lib' => $^O eq 'MSWin32' ? 'Pari,FastCalc' : 'GMP,Pari,FastCalc');
@ISA = qw/DateTime::Format::Epoch/;
# Epoch is 1970-01-01 00:00:00 TAI, is 1969-12-31T23:59:50 'utc'
my $epoch = DateTime->new( year => 1969, month => 12, day => 31,
hour => 23, minute => 59, second => 50 );
my $start = Math::BigInt->new(1) << 62;
sub new {
my $class = shift;
my %p = validate( @_,
{ format => { regex => qr/^string|number$/,
default => 'number' },
});
my $self = $class->SUPER::new( epoch => $epoch,
unit => 'seconds',
type => 'bigint',
skip_leap_seconds => 0,
start_at => $start );
$self->{is_string} = ($p{format} eq 'string');
return $self;
}
sub format_datetime {
my ($self, $dt) = @_;
my $n = $self->SUPER::format_datetime($dt);
if ($self->{is_string}) {
my $str = $n->as_hex;
my ($hex) = $str =~ /^0x(\w+)$/
or die "Unknown BigInt format '$str'\n";
my $retval = pack "H*", $hex;
$n = "0" x (8 - length$retval) . $retval;
}
return $n;
}
sub parse_datetime {
my ($self, $n) = @_;
if ($self->{is_string}) {
my $hexstr = '0x' . unpack 'H*', $n;
$n = Math::BigInt->new($hexstr);
}
return $self->SUPER::parse_datetime($n);
}
1;
__END__
=head1 NAME
DateTime::Format::Epoch::TAI64 - Convert DateTimes to/from TAI64 values
=head1 SYNOPSIS
use DateTime::Format::Epoch::TAI64;
my $dt = DateTime::Format::Epoch::TAI64
->parse_datetime( '4611686019483526367' );
# 2003-06-20T19:49:59
DateTime::Format::Epoch::TAI64->format_datetime($dt);
# 4611686019483526367
my $formatter = DateTime::Format::Epoch::TAI64->new();
$dt = $formatter->parse_datetime( '4611686019483526367' );
# 2003-06-20T19:49:59
$formatter->format_datetime($dt);
# 4611686019483526367
my $str_frmt = DateTime::Format::Epoch::TAI64->new(
format => 'string' );
$dt = $str_frmt->parse_datetime( "\x40\0\0\0\x3e\xf3\x69\x6a" );
# 2003-06-20T19:49:59
$str_frmt->format_datetime($dt);
# "\x40\0\0\0\x3e\xf3\x69\x6a"
=head1 DESCRIPTION
This module can convert a DateTime object (or any object that can be
converted to a DateTime object) to a TAI64 value. The TAI64 timescale
covers the entire expected lifespan of the universe (at least, if you
expect the universe to be closed).
=head1 METHODS
Most of the methods are the same as those in L<DateTime::Format::Epoch>.
The only difference is the constructor.
=over 4
=item * new( [format => 'string'] )
Constructor of the formatter/parser object. If the optional format
parameter is set to 'string', TAI64 values will be expected to be 8
byte strings.
=back
=head1 SUPPORT
Support for this module is provided via the datetime@perl.org email
list. See http://lists.perl.org/ for more details.
=head1 AUTHOR
Eugene van der Pijll <pijll@gmx.net>
=head1 COPYRIGHT
Copyright (c) 2003, 2004 Eugene van der Pijll. All rights reserved. This
program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
=head1 SEE ALSO
L<DateTime>
datetime@perl.org mailing list
http://cr.yp.to/time.html
=cut
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