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|
use strict;
use warnings;
use Test::Fatal;
use Test::More;
use DateTime;
# These tests should be the final word on dt addition involving a
# DST-changing time zone
# time addition is "wait X amount of time, then what does the clock
# say?" this means it acts on the UTC components.
{
my $dt = DateTime->new(
year => 2003, month => 4, day => 6,
time_zone => 'America/Chicago',
);
$dt->add( hours => 1 );
is(
$dt->datetime, '2003-04-06T01:00:00',
'add one hour to midnight, get 1 am'
);
is(
exception { $dt->add( hours => 1 ) },
undef,
'no error adding 1 hour just before DST leap forward'
);
is(
$dt->datetime, '2003-04-06T03:00:00',
'add one hour to 1 am, get 3 am'
);
$dt->subtract( hours => 1 );
is(
$dt->datetime, '2003-04-06T01:00:00',
'subtract one hour from 3 am, get 1 am'
);
$dt->subtract( hours => 1 );
is(
$dt->datetime, '2003-04-06T00:00:00',
'subtract one hour from 1 am, get midnight'
);
}
{
my $dt = DateTime->new(
year => 2003, month => 10, day => 26,
time_zone => 'America/Chicago',
);
$dt->add( hours => 1 );
is(
$dt->datetime, '2003-10-26T01:00:00',
'add one hour to midnight, get 1 am'
);
$dt->add( hours => 1 );
is(
$dt->datetime, '2003-10-26T01:00:00',
'add one hour to 1 am, get 1 am (again)'
);
$dt->add( hours => 1 );
is(
$dt->datetime, '2003-10-26T02:00:00',
'add one hour to 1 am (2nd time), get 2 am'
);
$dt->subtract( hours => 1 );
is(
$dt->datetime, '2003-10-26T01:00:00',
'subtract 1 hour from 2 am, get 1 am'
);
$dt->subtract( hours => 1 );
is(
$dt->datetime, '2003-10-26T01:00:00',
'subtract 1 hour from 1 am, get 1 am (again)'
);
$dt->subtract( hours => 1 );
is(
$dt->datetime, '2003-10-26T00:00:00',
'subtract 1 hour from 1 am (2nd), get midnight'
);
}
# date addition is "leave the clock alone, just change the date
# portion". this means it acts on local components
{
my $dt = DateTime->new(
year => 2003, month => 4, day => 6,
time_zone => 'America/Chicago',
);
$dt->add( days => 1 );
is(
$dt->datetime, '2003-04-07T00:00:00',
'add 1 day at midnight, same clock time'
);
$dt->add( months => 7 );
is(
$dt->datetime, '2003-11-07T00:00:00',
'add 7 months at midnight, same clock time'
);
$dt->subtract( months => 7 );
is(
$dt->datetime, '2003-04-07T00:00:00',
'subtract 7 months at midnight, same clock time'
);
$dt->subtract( days => 1 );
is(
$dt->datetime, '2003-04-06T00:00:00',
'subtract 1 day at midnight, same clock time'
);
}
{
my $dt = DateTime->new(
year => 2003, month => 10, day => 26,
time_zone => 'America/Chicago',
);
$dt->add( days => 1 );
is(
$dt->datetime, '2003-10-27T00:00:00',
'add 1 day at midnight, get midnight'
);
$dt->add( months => 7 );
is(
$dt->datetime, '2004-05-27T00:00:00',
'add 7 months at midnight, get midnight'
);
$dt->subtract( months => 7 );
is(
$dt->datetime, '2003-10-27T00:00:00',
'subtract 7 months at midnight, get midnight'
);
$dt->subtract( days => 1 );
is(
$dt->datetime, '2003-10-26T00:00:00',
'subtract 1 day at midnight, get midnight'
);
}
# date and time addition in one call is still two separate operations.
# First we do date, then time.
{
my $dt = DateTime->new(
year => 2003, month => 4, day => 5,
time_zone => 'America/Chicago',
);
$dt->add( days => 1, hours => 2 );
is(
$dt->datetime, '2003-04-06T03:00:00',
'add one day & 2 hours from midnight, get 3 am'
);
# !!! - not reversible this way - needs some good docs
my $dt1 = $dt->clone->subtract( days => 1, hours => 2 );
is(
$dt1->datetime, '2003-04-05T01:00:00',
'subtract one day & 2 hours from 3 am, get 1 am'
);
# is reversible this way - also needs docs
my $dt2 = $dt->clone->subtract( hours => 2 )->subtract( days => 1 );
is(
$dt2->datetime, '2003-04-05T00:00:00',
'subtract 2 hours and then one day from 3 am, get midnight'
);
}
{
my $dt = DateTime->new(
year => 2003, month => 10, day => 25,
time_zone => 'America/Chicago',
);
$dt->add( days => 1, hours => 2 );
is(
$dt->datetime, '2003-10-26T01:00:00',
'add one day & 2 hours from midnight, get 1 am'
);
my $dt1 = $dt->clone->subtract( days => 1, hours => 2 );
is(
$dt1->datetime, '2003-10-24T23:00:00',
'add one day & 2 hours from midnight, get 11 pm'
);
my $dt2 = $dt->clone->subtract( hours => 2 )->subtract( days => 1 );
is(
$dt2->datetime, '2003-10-25T00:00:00',
'subtract 2 hours and then one day from 3 am, get midnight'
);
}
# an example from the docs
{
my $dt = DateTime->new(
year => 2003, month => 4, day => 5,
hour => 2,
time_zone => 'America/Chicago',
);
$dt->add( hours => 24 );
is(
$dt->datetime, '2003-04-06T03:00:00',
'datetime after adding 24 hours is 2003-04-06T03:00:00'
);
}
done_testing();
|
