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import { module, test } from '../qunit';
import moment from '../../moment';

function equal(assert, a, b, message) {
    assert.ok(
        Math.abs(a - b) < 0.00000001,
        '(' + a + ' === ' + b + ') ' + message
    );
}

function dstForYear(year) {
    var start = moment([year]),
        end = moment([year + 1]),
        current = start.clone(),
        last;

    while (current < end) {
        last = current.clone();
        current.add(24, 'hour');
        if (last.utcOffset() !== current.utcOffset()) {
            end = current.clone();
            current = last.clone();
            break;
        }
    }

    while (current < end) {
        last = current.clone();
        current.add(1, 'hour');
        if (last.utcOffset() !== current.utcOffset()) {
            return {
                moment: last,
                diff: -(current.utcOffset() - last.utcOffset()) / 60,
            };
        }
    }
}

module('diff');

test('diff', function (assert) {
    assert.equal(moment(1000).diff(0), 1000, '1 second - 0 = 1000');
    assert.equal(moment(1000).diff(500), 500, '1 second - 0.5 seconds = 500');
    assert.equal(moment(0).diff(1000), -1000, '0 - 1 second = -1000');
    assert.equal(
        moment(new Date(1000)).diff(1000),
        0,
        '1 second - 1 second = 0'
    );
    var oneHourDate = new Date(2015, 5, 21),
        nowDate = new Date(+oneHourDate);
    oneHourDate.setHours(oneHourDate.getHours() + 1);
    assert.equal(
        moment(oneHourDate).diff(nowDate),
        60 * 60 * 1000,
        '1 hour from now = 3600000'
    );
});

test('diff key after', function (assert) {
    assert.equal(moment([2010]).diff([2011], 'years'), -1, 'year diff');
    assert.equal(moment([2010]).diff([2010, 2], 'months'), -2, 'month diff');
    assert.equal(moment([2010]).diff([2010, 0, 7], 'weeks'), 0, 'week diff');
    assert.equal(moment([2010]).diff([2010, 0, 8], 'weeks'), -1, 'week diff');
    assert.equal(moment([2010]).diff([2010, 0, 21], 'weeks'), -2, 'week diff');
    assert.equal(moment([2010]).diff([2010, 0, 22], 'weeks'), -3, 'week diff');
    assert.equal(moment([2010]).diff([2010, 0, 4], 'days'), -3, 'day diff');
    assert.equal(
        moment([2010]).diff([2010, 0, 1, 4], 'hours'),
        -4,
        'hour diff'
    );
    assert.equal(
        moment([2010]).diff([2010, 0, 1, 0, 5], 'minutes'),
        -5,
        'minute diff'
    );
    assert.equal(
        moment([2010]).diff([2010, 0, 1, 0, 0, 6], 'seconds'),
        -6,
        'second diff'
    );
});

test('diff key before', function (assert) {
    assert.equal(moment([2011]).diff([2010], 'years'), 1, 'year diff');
    assert.equal(moment([2010, 2]).diff([2010], 'months'), 2, 'month diff');
    assert.equal(moment([2010, 0, 4]).diff([2010], 'days'), 3, 'day diff');
    assert.equal(moment([2010, 0, 7]).diff([2010], 'weeks'), 0, 'week diff');
    assert.equal(moment([2010, 0, 8]).diff([2010], 'weeks'), 1, 'week diff');
    assert.equal(moment([2010, 0, 21]).diff([2010], 'weeks'), 2, 'week diff');
    assert.equal(moment([2010, 0, 22]).diff([2010], 'weeks'), 3, 'week diff');
    assert.equal(moment([2010, 0, 1, 4]).diff([2010], 'hours'), 4, 'hour diff');
    assert.equal(
        moment([2010, 0, 1, 0, 5]).diff([2010], 'minutes'),
        5,
        'minute diff'
    );
    assert.equal(
        moment([2010, 0, 1, 0, 0, 6]).diff([2010], 'seconds'),
        6,
        'second diff'
    );
});

test('diff key before singular', function (assert) {
    assert.equal(moment([2011]).diff([2010], 'year'), 1, 'year diff singular');
    assert.equal(
        moment([2010, 2]).diff([2010], 'month'),
        2,
        'month diff singular'
    );
    assert.equal(
        moment([2010, 0, 4]).diff([2010], 'day'),
        3,
        'day diff singular'
    );
    assert.equal(
        moment([2010, 0, 7]).diff([2010], 'week'),
        0,
        'week diff singular'
    );
    assert.equal(
        moment([2010, 0, 8]).diff([2010], 'week'),
        1,
        'week diff singular'
    );
    assert.equal(
        moment([2010, 0, 21]).diff([2010], 'week'),
        2,
        'week diff singular'
    );
    assert.equal(
        moment([2010, 0, 22]).diff([2010], 'week'),
        3,
        'week diff singular'
    );
    assert.equal(
        moment([2010, 0, 1, 4]).diff([2010], 'hour'),
        4,
        'hour diff singular'
    );
    assert.equal(
        moment([2010, 0, 1, 0, 5]).diff([2010], 'minute'),
        5,
        'minute diff singular'
    );
    assert.equal(
        moment([2010, 0, 1, 0, 0, 6]).diff([2010], 'second'),
        6,
        'second diff singular'
    );
});

test('diff key before abbreviated', function (assert) {
    assert.equal(moment([2011]).diff([2010], 'y'), 1, 'year diff abbreviated');
    assert.equal(
        moment([2010, 2]).diff([2010], 'M'),
        2,
        'month diff abbreviated'
    );
    assert.equal(
        moment([2010, 0, 4]).diff([2010], 'd'),
        3,
        'day diff abbreviated'
    );
    assert.equal(
        moment([2010, 0, 7]).diff([2010], 'w'),
        0,
        'week diff abbreviated'
    );
    assert.equal(
        moment([2010, 0, 8]).diff([2010], 'w'),
        1,
        'week diff abbreviated'
    );
    assert.equal(
        moment([2010, 0, 21]).diff([2010], 'w'),
        2,
        'week diff abbreviated'
    );
    assert.equal(
        moment([2010, 0, 22]).diff([2010], 'w'),
        3,
        'week diff abbreviated'
    );
    assert.equal(
        moment([2010, 0, 1, 4]).diff([2010], 'h'),
        4,
        'hour diff abbreviated'
    );
    assert.equal(
        moment([2010, 0, 1, 0, 5]).diff([2010], 'm'),
        5,
        'minute diff abbreviated'
    );
    assert.equal(
        moment([2010, 0, 1, 0, 0, 6]).diff([2010], 's'),
        6,
        'second diff abbreviated'
    );
});

test('diff month', function (assert) {
    assert.equal(
        moment([2011, 0, 31]).diff([2011, 2, 1], 'months'),
        -1,
        'month diff'
    );
});

test('end of month diff', function (assert) {
    assert.equal(
        moment('2016-02-29').diff('2016-01-30', 'months'),
        1,
        'Feb 29 to Jan 30 should be 1 month'
    );
    assert.equal(
        moment('2016-02-29').diff('2016-01-31', 'months'),
        1,
        'Feb 29 to Jan 31 should be 1 month'
    );
    assert.equal(
        moment('2016-05-31')
            .add(1, 'month')
            .diff(moment('2016-05-31'), 'month'),
        1,
        '(May 31 plus 1 month) to May 31 should be 1 month diff'
    );
});

test('end of month diff with time behind', function (assert) {
    assert.equal(
        moment('2017-03-31').diff('2017-02-28', 'months'),
        1,
        'Feb 28 to March 31 should be 1 month'
    );
    assert.equal(
        moment('2017-02-28').diff('2017-03-31', 'months'),
        -1,
        'Feb 28 to March 31 should be 1 month'
    );
});

test('diff across DST', function (assert) {
    var dst = dstForYear(2012),
        a,
        b;
    if (!dst) {
        assert.equal(42, 42, 'at least one assertion');
        return;
    }

    a = dst.moment;
    b = a.clone().utc().add(12, 'hours').local();
    assert.equal(
        b.diff(a, 'milliseconds', true),
        12 * 60 * 60 * 1000,
        'ms diff across DST'
    );
    assert.equal(
        b.diff(a, 'seconds', true),
        12 * 60 * 60,
        'second diff across DST'
    );
    assert.equal(b.diff(a, 'minutes', true), 12 * 60, 'minute diff across DST');
    assert.equal(b.diff(a, 'hours', true), 12, 'hour diff across DST');
    assert.equal(
        b.diff(a, 'days', true),
        (12 - dst.diff) / 24,
        'day diff across DST'
    );
    equal(
        assert,
        b.diff(a, 'weeks', true),
        (12 - dst.diff) / 24 / 7,
        'week diff across DST'
    );
    assert.ok(
        0.95 / (2 * 31) < b.diff(a, 'months', true),
        'month diff across DST, lower bound'
    );
    assert.ok(
        b.diff(a, 'month', true) < 1.05 / (2 * 28),
        'month diff across DST, upper bound'
    );
    assert.ok(
        0.95 / (2 * 31 * 12) < b.diff(a, 'years', true),
        'year diff across DST, lower bound'
    );
    assert.ok(
        b.diff(a, 'year', true) < 1.05 / (2 * 28 * 12),
        'year diff across DST, upper bound'
    );

    a = dst.moment;
    b = a
        .clone()
        .utc()
        .add(12 + dst.diff, 'hours')
        .local();

    assert.equal(
        b.diff(a, 'milliseconds', true),
        (12 + dst.diff) * 60 * 60 * 1000,
        'ms diff across DST'
    );
    assert.equal(
        b.diff(a, 'seconds', true),
        (12 + dst.diff) * 60 * 60,
        'second diff across DST'
    );
    assert.equal(
        b.diff(a, 'minutes', true),
        (12 + dst.diff) * 60,
        'minute diff across DST'
    );
    assert.equal(
        b.diff(a, 'hours', true),
        12 + dst.diff,
        'hour diff across DST'
    );
    assert.equal(b.diff(a, 'days', true), 12 / 24, 'day diff across DST');
    equal(
        assert,
        b.diff(a, 'weeks', true),
        12 / 24 / 7,
        'week diff across DST'
    );
    assert.ok(
        0.95 / (2 * 31) < b.diff(a, 'months', true),
        'month diff across DST, lower bound'
    );
    assert.ok(
        b.diff(a, 'month', true) < 1.05 / (2 * 28),
        'month diff across DST, upper bound'
    );
    assert.ok(
        0.95 / (2 * 31 * 12) < b.diff(a, 'years', true),
        'year diff across DST, lower bound'
    );
    assert.ok(
        b.diff(a, 'year', true) < 1.05 / (2 * 28 * 12),
        'year diff across DST, upper bound'
    );
});

test('diff overflow', function (assert) {
    assert.equal(moment([2011]).diff([2010], 'months'), 12, 'month diff');
    assert.equal(moment([2010, 0, 2]).diff([2010], 'hours'), 24, 'hour diff');
    assert.equal(
        moment([2010, 0, 1, 2]).diff([2010], 'minutes'),
        120,
        'minute diff'
    );
    assert.equal(
        moment([2010, 0, 1, 0, 4]).diff([2010], 'seconds'),
        240,
        'second diff'
    );
});

test('diff between utc and local', function (assert) {
    if (moment([2012]).utcOffset() === moment([2011]).utcOffset()) {
        // Russia's utc offset on 1st of Jan 2012 vs 2011 is different
        assert.equal(
            moment([2012]).utc().diff([2011], 'years'),
            1,
            'year diff'
        );
    }
    assert.equal(
        moment([2010, 2, 2]).utc().diff([2010, 0, 2], 'months'),
        2,
        'month diff'
    );
    assert.equal(
        moment([2010, 0, 4]).utc().diff([2010], 'days'),
        3,
        'day diff'
    );
    assert.equal(
        moment([2010, 0, 22]).utc().diff([2010], 'weeks'),
        3,
        'week diff'
    );
    assert.equal(
        moment([2010, 0, 1, 4]).utc().diff([2010], 'hours'),
        4,
        'hour diff'
    );
    assert.equal(
        moment([2010, 0, 1, 0, 5]).utc().diff([2010], 'minutes'),
        5,
        'minute diff'
    );
    assert.equal(
        moment([2010, 0, 1, 0, 0, 6]).utc().diff([2010], 'seconds'),
        6,
        'second diff'
    );
});

test('diff floored', function (assert) {
    assert.equal(
        moment([2010, 0, 1, 23]).diff([2010], 'day'),
        0,
        '23 hours = 0 days'
    );
    assert.equal(
        moment([2010, 0, 1, 23, 59]).diff([2010], 'day'),
        0,
        '23:59 hours = 0 days'
    );
    assert.equal(
        moment([2010, 0, 1, 24]).diff([2010], 'day'),
        1,
        '24 hours = 1 day'
    );
    assert.equal(
        moment([2010, 0, 2]).diff([2011, 0, 1], 'year'),
        0,
        'year rounded down'
    );
    assert.equal(
        moment([2011, 0, 1]).diff([2010, 0, 2], 'year'),
        0,
        'year rounded down'
    );
    assert.equal(
        moment([2010, 0, 2]).diff([2011, 0, 2], 'year'),
        -1,
        'year rounded down'
    );
    assert.equal(
        moment([2011, 0, 2]).diff([2010, 0, 2], 'year'),
        1,
        'year rounded down'
    );
});

test('year diffs include dates', function (assert) {
    assert.ok(
        moment([2012, 1, 19]).diff(moment([2002, 1, 20]), 'years', true) < 10,
        'year diff should include date of month'
    );
});

test('month diffs', function (assert) {
    // due to floating point math errors, these tests just need to be accurate within 0.00000001
    assert.equal(
        moment([2012, 0, 1]).diff([2012, 1, 1], 'months', true),
        -1,
        'Jan 1 to Feb 1 should be 1 month'
    );
    equal(
        assert,
        moment([2012, 0, 1]).diff([2012, 0, 1, 12], 'months', true),
        -0.5 / 31,
        'Jan 1 to Jan 1 noon should be 0.5 / 31 months'
    );
    assert.equal(
        moment([2012, 0, 15]).diff([2012, 1, 15], 'months', true),
        -1,
        'Jan 15 to Feb 15 should be 1 month'
    );
    assert.equal(
        moment([2012, 0, 28]).diff([2012, 1, 28], 'months', true),
        -1,
        'Jan 28 to Feb 28 should be 1 month'
    );
    assert.ok(
        moment([2012, 0, 31]).diff([2012, 1, 29], 'months', true),
        -1,
        'Jan 31 to Feb 29 should be 1 month'
    );
    assert.ok(
        -1 > moment([2012, 0, 31]).diff([2012, 2, 1], 'months', true),
        'Jan 31 to Mar 1 should be more than 1 month'
    );
    assert.ok(
        -30 / 28 < moment([2012, 0, 31]).diff([2012, 2, 1], 'months', true),
        'Jan 31 to Mar 1 should be less than 1 month and 1 day'
    );
    equal(
        assert,
        moment([2012, 0, 1]).diff([2012, 0, 31], 'months', true),
        -(30 / 31),
        'Jan 1 to Jan 31 should be 30 / 31 months'
    );
    assert.ok(
        0 < moment('2014-02-01').diff(moment('2014-01-31'), 'months', true),
        'jan-31 to feb-1 diff is positive'
    );
});

test('exact month diffs', function (assert) {
    // generate all pairs of months and compute month diff, with fixed day
    // of month = 15.

    var m1, m2;
    for (m1 = 0; m1 < 12; ++m1) {
        for (m2 = m1; m2 < 12; ++m2) {
            assert.equal(
                moment([2013, m2, 15]).diff(
                    moment([2013, m1, 15]),
                    'months',
                    true
                ),
                m2 - m1,
                'month diff from 2013-' + m1 + '-15 to 2013-' + m2 + '-15'
            );
        }
    }
});

test('year diffs', function (assert) {
    // due to floating point math errors, these tests just need to be accurate within 0.00000001
    equal(
        assert,
        moment([2012, 0, 1]).diff([2013, 0, 1], 'years', true),
        -1,
        'Jan 1 2012 to Jan 1 2013 should be 1 year'
    );
    equal(
        assert,
        moment([2012, 1, 28]).diff([2013, 1, 28], 'years', true),
        -1,
        'Feb 28 2012 to Feb 28 2013 should be 1 year'
    );
    equal(
        assert,
        moment([2012, 2, 1]).diff([2013, 2, 1], 'years', true),
        -1,
        'Mar 1 2012 to Mar 1 2013 should be 1 year'
    );
    equal(
        assert,
        moment([2012, 11, 1]).diff([2013, 11, 1], 'years', true),
        -1,
        'Dec 1 2012 to Dec 1 2013 should be 1 year'
    );
    equal(
        assert,
        moment([2012, 11, 31]).diff([2013, 11, 31], 'years', true),
        -1,
        'Dec 31 2012 to Dec 31 2013 should be 1 year'
    );
    equal(
        assert,
        moment([2012, 0, 1]).diff([2013, 6, 1], 'years', true),
        -1.5,
        'Jan 1 2012 to Jul 1 2013 should be 1.5 years'
    );
    equal(
        assert,
        moment([2012, 0, 31]).diff([2013, 6, 31], 'years', true),
        -1.5,
        'Jan 31 2012 to Jul 31 2013 should be 1.5 years'
    );
    equal(
        assert,
        moment([2012, 0, 1]).diff([2013, 0, 1, 12], 'years', true),
        -1 - 0.5 / 31 / 12,
        'Jan 1 2012 to Jan 1 2013 noon should be 1+(0.5 / 31) / 12 years'
    );
    equal(
        assert,
        moment([2012, 0, 1]).diff([2013, 6, 1, 12], 'years', true),
        -1.5 - 0.5 / 31 / 12,
        'Jan 1 2012 to Jul 1 2013 noon should be 1.5+(0.5 / 31) / 12 years'
    );
    equal(
        assert,
        moment([2012, 1, 29]).diff([2013, 1, 28], 'years', true),
        -1,
        'Feb 29 2012 to Feb 28 2013 should be 1-(1 / 28.5) / 12 years'
    );
});

test('negative zero', function (assert) {
    function isNegative(n) {
        return 1 / n < 0;
    }
    assert.ok(
        !isNegative(moment([2012, 0, 1]).diff(moment([2012, 0, 1]), 'months')),
        'month diff on same date is zero, not -0'
    );
    assert.ok(
        !isNegative(moment([2012, 0, 1]).diff(moment([2012, 0, 1]), 'years')),
        'year diff on same date is zero, not -0'
    );
    assert.ok(
        !isNegative(
            moment([2012, 0, 1]).diff(moment([2012, 0, 1]), 'quarters')
        ),
        'quarter diff on same date is zero, not -0'
    );
    assert.ok(
        !isNegative(moment([2012, 0, 1]).diff(moment([2012, 0, 1, 1]), 'days')),
        'days diff on same date is zero, not -0'
    );
    assert.ok(
        !isNegative(
            moment([2012, 0, 1]).diff(moment([2012, 0, 1, 0, 1]), 'hours')
        ),
        'hour diff on same hour is zero, not -0'
    );
    assert.ok(
        !isNegative(
            moment([2012, 0, 1]).diff(moment([2012, 0, 1, 0, 0, 1]), 'minutes')
        ),
        'minute diff on same minute is zero, not -0'
    );
    assert.ok(
        !isNegative(
            moment([2012, 0, 1]).diff(
                moment([2012, 0, 1, 0, 0, 0, 1]),
                'seconds'
            )
        ),
        'second diff on same second is zero, not -0'
    );
});
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Email: jattceo@gmail.com