Return a short date format for the given relative date. - Node.js Date

Node.js examples for Date:Date Format

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Description

Return a short date format for the given relative date.

Demo Code


/**/*from  www  .j av  a  2 s  . c o m*/
 * Return a short date format for the given relative date.
 *
 * Relative dates can be 'today', 'tomorrow', 'the day after'
 * or a day of the week (e.g. 'Monday') and the date returned
 * will be in the future (except for 'today').
 *
 * @return {String} - a short date
 * @return null - if the relative date is not recognized
 * @see Date.toShortDate
 */
Date.parseRelative = function (date) {
    var now_msec = Date.now(),
        new_date = null,
        day_indx = -1,
        days_off = 0;

    date = date.toLowerCase();

    // Today
    if (date === 'today') {
        new_date = new Date();

    // Tomorrow
    } else if (date === 'tomorrow') {
        now_msec += (24 * 60 * 60 * 1) * 1000;
        new_date = new Date(now_msec);

    // The day after
    } else if (date === 'the day after') {
        now_msec += (24 * 60 * 60 * 2) * 1000;
        new_date = new Date(now_msec);

    // 07/01
    } else if (date.match(/^\d\d\/\d\d$/)) {
        new_date = date + '/' + (new Date()).getFullYear();
        new_date = new Date(Date.parse(new_date));
        return new_date.toShortDate();

    } else {

        // Monday, Tuesday, etc.
        if (Date.DaysOfTheWeek.indexOf(date) !== -1) {
            day_indx = Date.DaysOfTheWeek.indexOf(date);

        // Mon, Tue, Wed
        } else if (Date.DOWs.indexOf(date) !== -1) {
            day_indx = Date.DOWs.indexOf(date);
        }

        if (day_indx !== -1) {
            new_date = new Date();
            if (day_indx < new_date.getDay()) {
                days_off = day_indx + 7 - new_date.getDay();
            } else if (day_indx > new_date.getDay()) {
                days_off = day_indx - new_date.getDay();
            } else {
                days_off = 7;
            }
            now_msec += (24 * 60 * 60 * days_off) * 1000;
            new_date = new Date(now_msec);
        }
    }

    if (new_date !== null) {
        return new_date.toShortDate();
    }

    // Error
    return null;
};
/**
 * This is a set of javascript object extensions used to help
 * format data and manipulate dates.
 */


// US only extension
Date.Months = ['January', 'February', 'March', 'April',
               'May', 'June', 'July', 'August',
               'September', 'October', 'November', 'December'];
Date.Mos    = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
               'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
Date.DaysOfTheWeek = ['sunday', 'monday', 'tuesday',
               'wednesday', 'thursday', 'friday', 'saturday'];
Date.DOWs   = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];



/**
 * addDays - move a date forward or backward by a number of days.
 *
 * @param {Number} days - an integer value
 * @return this
 */
Date.prototype.addDays = function (days) {
    if (isNaN(days)) {
        throw 'addDays: days "' + days + '" is not a number';
    }
    if (!isFinite(days)) {
        throw 'addDays: days "' + days + '" must be finite';
    }
    if (Math.floor(days) !== days) {
        throw 'addDays: days "' + days + '" must be an integer';
    }
    this.setDate(this.getDate() + days);
    return this;
};

/**
 * toShortdate - returns a date in Mon DD, YYYY format
 *
 * @return {String} - an abbreviated date form
 */
Date.prototype.toShortDate = function () {
    return Date.Mos[this.getMonth()] + ' ' + this.getDate() + ', ' + this.getFullYear();
};

/**
 * getDayOfWeek - Returns full day name for the current day.
 *
 * @return {String} - Sun, Mon, Tue, etc.
 */
Date.prototype.getDayOfWeek = function () {
    return Date.DaysOfTheWeek[this.getDay()].capitalize();
};

/**
 * getDOW - Returns short day name for the current day.
 *
 * @return {String} - Sun, Mon, Tue, etc.
 */
Date.prototype.getDOW = function () {
    return Date.DOWs[this.getDay()];
};

/**
 * getMonthLong - Returns full month name for the current month.
 *
 * @return {String} - January, February, March, etc.
 */
Date.prototype.getMonthLong = function () {
    return Date.Months[this.getMonth()];
};

/**
 * getMonthShort - Return the 3 letter representation of the
 * current month.
 *
 * @return {String} - Jan, Feb, Mar, etc.
 */
Date.prototype.getMonthShort = function () {
    return Date.Mos[this.getMonth()];
};

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