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Viewing file:     diff.js (2.29 KB)      -rw-r--r--

import absFloor from '../utils/abs-floor';
import { cloneWithOffset } from '../units/offset';
import { normalizeUnits } from '../units/aliases';

export function diff(input, units, asFloat) {
    var that, zoneDelta, output;

    if (!this.isValid()) {
        return NaN;
    }

    that = cloneWithOffset(input, this);

    if (!that.isValid()) {
        return NaN;
    }

    zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4;

    units = normalizeUnits(units);

    switch (units) {
        case 'year':
            output = monthDiff(this, that) / 12;
            break;
        case 'month':
            output = monthDiff(this, that);
            break;
        case 'quarter':
            output = monthDiff(this, that) / 3;
            break;
        case 'second':
            output = (this - that) / 1e3;
            break; // 1000
        case 'minute':
            output = (this - that) / 6e4;
            break; // 1000 * 60
        case 'hour':
            output = (this - that) / 36e5;
            break; // 1000 * 60 * 60
        case 'day':
            output = (this - that - zoneDelta) / 864e5;
            break; // 1000 * 60 * 60 * 24, negate dst
        case 'week':
            output = (this - that - zoneDelta) / 6048e5;
            break; // 1000 * 60 * 60 * 24 * 7, negate dst
        default:
            output = this - that;
    }

    return asFloat ? output : absFloor(output);
}

function monthDiff(a, b) {
    if (a.date() < b.date()) {
        // end-of-month calculations work correct when the start month has more
        // days than the end month.
        return -monthDiff(b, a);
    }
    // difference in months
    var wholeMonthDiff = (b.year() - a.year()) * 12 + (b.month() - a.month()),
        // b is in (anchor - 1 month, anchor + 1 month)
        anchor = a.clone().add(wholeMonthDiff, 'months'),
        anchor2,
        adjust;

    if (b - anchor < 0) {
        anchor2 = a.clone().add(wholeMonthDiff - 1, 'months');
        // linear across the month
        adjust = (b - anchor) / (anchor - anchor2);
    } else {
        anchor2 = a.clone().add(wholeMonthDiff + 1, 'months');
        // linear across the month
        adjust = (b - anchor) / (anchor2 - anchor);
    }

    //check for negative zero, return zero if negative zero
    return -(wholeMonthDiff + adjust) || 0;
}