    /**
     * @class Ext.form.field.Date
     * @extends Ext.form.field.Picker

    Provides a date input field with a {@link Ext.picker.Date date picker} dropdown and automatic date
    validation.

    This field recognizes and uses the JavaScript Date object as its main {@link #value} type. In addition,
    it recognizes string values which are parsed according to the {@link #format} and/or {@link #altFormats}
    configs. These may be reconfigured to use date formats appropriate for the user's locale.

    The field may be limited to a certain range of dates by using the {@link #minValue}, {@link #maxValue},
    {@link #disabledDays}, and {@link #disabledDates} config parameters. These configurations will be used both
    in the field's validation, and in the date picker dropdown by preventing invalid dates from being selected.
    {@img Ext.form.Date/Ext.form.Date.png Ext.form.Date component}
    #Example usage:#

        Ext.create('Ext.form.Panel', {
            width: 300,
            bodyPadding: 10,
            title: 'Dates',
            items: [{
                xtype: 'datefield',
                anchor: '100%',
                fieldLabel: 'From',
                name: 'from_date',
                maxValue: new Date()  // limited to the current date or prior
            }, {
                xtype: 'datefield',
                anchor: '100%',
                fieldLabel: 'To',
                name: 'to_date',
                value: new Date()  // defaults to today
            }],
                renderTo: Ext.getBody()
        });

    #Date Formats Examples#

    This example shows a couple of different date format parsing scenarios. Both use custom date format
    configurations; the first one matches the configured `format` while the second matches the `altFormats`.

        Ext.create('Ext.form.Panel', {
            renderTo: Ext.getBody(),
            width: 300,
            bodyPadding: 10,
            title: 'Dates',
            items: [{
                xtype: 'datefield',
                anchor: '100%',
                fieldLabel: 'Date',
                name: 'date',
                // The value matches the format; will be parsed and displayed using that format.
                format: 'm d Y',
                value: '2 4 1978'
            }, {
                xtype: 'datefield',
                anchor: '100%',
                fieldLabel: 'Date',
                name: 'date',
                // The value does not match the format, but does match an altFormat; will be parsed
                // using the altFormat and displayed using the format.
                format: 'm d Y',
                altFormats: 'm,d,Y|m.d.Y',
                value: '2.4.1978'
            }]
        });

     * @constructor
     * Create a new Date field
     * @param {Object} config
     *
     * @xtype datefield
     * @markdown
     * @docauthor Jason Johnston <jason@sencha.com>
     */
    Ext.define('Ext.form.field.Date', {
        extend:'Ext.form.field.Picker',
        alias: 'widget.datefield',
        requires: ['Ext.picker.Date'],
        alternateClassName: ['Ext.form.DateField', 'Ext.form.Date'],

        /**
         * @cfg {String} format
         * The default date format string which can be overriden for localization support.  The format must be
         * valid according to {@link Ext.Date#parse} (defaults to <tt>'m/d/Y'</tt>).
         */
        format : "m/d/Y",
        /**
         * @cfg {String} altFormats
         * Multiple date formats separated by "<tt>|</tt>" to try when parsing a user input value and it
         * does not match the defined format (defaults to
         * <tt>'m/d/Y|n/j/Y|n/j/y|m/j/y|n/d/y|m/j/Y|n/d/Y|m-d-y|m-d-Y|m/d|m-d|md|mdy|mdY|d|Y-m-d|n-j|n/j'</tt>).
         */
        altFormats : "m/d/Y|n/j/Y|n/j/y|m/j/y|n/d/y|m/j/Y|n/d/Y|m-d-y|m-d-Y|m/d|m-d|md|mdy|mdY|d|Y-m-d|n-j|n/j",
        /**
         * @cfg {String} disabledDaysText
         * The tooltip to display when the date falls on a disabled day (defaults to <tt>'Disabled'</tt>)
         */
        disabledDaysText : "Disabled",
        /**
         * @cfg {String} disabledDatesText
         * The tooltip text to display when the date falls on a disabled date (defaults to <tt>'Disabled'</tt>)
         */
        disabledDatesText : "Disabled",
        /**
         * @cfg {String} minText
         * The error text to display when the date in the cell is before <tt>{@link #minValue}</tt> (defaults to
         * <tt>'The date in this field must be after {minValue}'</tt>).
         */
        minText : "The date in this field must be equal to or after {0}",
        /**
         * @cfg {String} maxText
         * The error text to display when the date in the cell is after <tt>{@link #maxValue}</tt> (defaults to
         * <tt>'The date in this field must be before {maxValue}'</tt>).
         */
        maxText : "The date in this field must be equal to or before {0}",
        /**
         * @cfg {String} invalidText
         * The error text to display when the date in the field is invalid (defaults to
         * <tt>'{value} is not a valid date - it must be in the format {format}'</tt>).
         */
        invalidText : "{0} is not a valid date - it must be in the format {1}",
        /**
         * @cfg {String} triggerCls
         * An additional CSS class used to style the trigger button.  The trigger will always get the
         * class <tt>'x-form-trigger'</tt> and <tt>triggerCls</tt> will be <b>appended</b> if specified
         * (defaults to <tt>'x-form-date-trigger'</tt> which displays a calendar icon).
         */
        triggerCls : Ext.baseCSSPrefix + 'form-date-trigger',
        /**
         * @cfg {Boolean} showToday
         * <tt>false</tt> to hide the footer area of the Date picker containing the Today button and disable
         * the keyboard handler for spacebar that selects the current date (defaults to <tt>true</tt>).
         */
        showToday : true,
        /**
         * @cfg {Date/String} minValue
         * The minimum allowed date. Can be either a Javascript date object or a string date in a
         * valid format (defaults to undefined).
         */
        /**
         * @cfg {Date/String} maxValue
         * The maximum allowed date. Can be either a Javascript date object or a string date in a
         * valid format (defaults to undefined).
         */
        /**
         * @cfg {Array} disabledDays
         * An array of days to disable, 0 based (defaults to undefined). Some examples:<pre><code>
    // disable Sunday and Saturday:
    disabledDays:  [0, 6]
    // disable weekdays:
    disabledDays: [1,2,3,4,5]
         * </code></pre>
         */
        /**
         * @cfg {Array} disabledDates
         * An array of "dates" to disable, as strings. These strings will be used to build a dynamic regular
         * expression so they are very powerful. Some examples:<pre><code>
    // disable these exact dates:
    disabledDates: ["03/08/2003", "09/16/2003"]
    // disable these days for every year:
    disabledDates: ["03/08", "09/16"]
    // only match the beginning (useful if you are using short years):
    disabledDates: ["^03/08"]
    // disable every day in March 2006:
    disabledDates: ["03/../2006"]
    // disable every day in every March:
    disabledDates: ["^03"]
         * </code></pre>
         * Note that the format of the dates included in the array should exactly match the {@link #format} config.
         * In order to support regular expressions, if you are using a {@link #format date format} that has "." in
         * it, you will have to escape the dot when restricting dates. For example: <tt>["03\\.08\\.03"]</tt>.
         */

        /**
         * @cfg {String} submitFormat The date format string which will be submitted to the server.
         * The format must be valid according to {@link Ext.Date#parse} (defaults to <tt>{@link #format}</tt>).
         */

        // in the absence of a time value, a default value of 12 noon will be used
        // (note: 12 noon was chosen because it steers well clear of all DST timezone changes)
        initTime: '12', // 24 hour format

        initTimeFormat: 'H',

        matchFieldWidth: false,
        /**
         * @cfg {Number} startDay
         * Day index at which the week should begin, 0-based (defaults to 0, which is Sunday)
         */
        startDay: 0,

        initComponent : function(){
            var me = this,
                isString = Ext.isString,
                min, max;

            min = me.minValue;
            max = me.maxValue;
            if(isString(min)){
                me.minValue = me.parseDate(min);
            }
            if(isString(max)){
                me.maxValue = me.parseDate(max);
            }
            me.disabledDatesRE = null;
            me.initDisabledDays();

            me.callParent();
        },

        initValue: function() {
            var me = this,
                value = me.value;

            // If a String value was supplied, try to convert it to a proper Date
            if (Ext.isString(value)) {
                me.value = me.rawToValue(value);
            }

            me.callParent();
        },

        // private
        initDisabledDays : function(){
            if(this.disabledDates){
                var dd = this.disabledDates,
                    len = dd.length - 1,
                    re = "(?:";

                Ext.each(dd, function(d, i){
                    re += Ext.isDate(d) ? '^' + Ext.String.escapeRegex(d.dateFormat(this.format)) + '$' : dd[i];
                    if (i !== len) {
                        re += '|';
                    }
                }, this);
                this.disabledDatesRE = new RegExp(re + ')');
            }
        },

        /**
         * Replaces any existing disabled dates with new values and refreshes the Date picker.
         * @param {Array} disabledDates An array of date strings (see the <tt>{@link #disabledDates}</tt> config
         * for details on supported values) used to disable a pattern of dates.
         */
        setDisabledDates : function(dd){
            var me = this,
                picker = me.picker;

            me.disabledDates = dd;
            me.initDisabledDays();
            if (picker) {
                picker.setDisabledDates(me.disabledDatesRE);
            }
        },

        /**
         * Replaces any existing disabled days (by index, 0-6) with new values and refreshes the Date picker.
         * @param {Array} disabledDays An array of disabled day indexes. See the <tt>{@link #disabledDays}</tt>
         * config for details on supported values.
         */
        setDisabledDays : function(dd){
            var picker = this.picker;

            this.disabledDays = dd;
            if (picker) {
                picker.setDisabledDays(dd);
            }
        },

        /**
         * Replaces any existing <tt>{@link #minValue}</tt> with the new value and refreshes the Date picker.
         * @param {Date} value The minimum date that can be selected
         */
        setMinValue : function(dt){
            var me = this,
                picker = me.picker,
                minValue = (Ext.isString(dt) ? me.parseDate(dt) : dt);

            me.minValue = minValue;
            if (picker) {
                picker.minText = Ext.String.format(me.minText, me.formatDate(me.minValue));
                picker.setMinDate(minValue);
            }
        },

        /**
         * Replaces any existing <tt>{@link #maxValue}</tt> with the new value and refreshes the Date picker.
         * @param {Date} value The maximum date that can be selected
         */
        setMaxValue : function(dt){
            var me = this,
                picker = me.picker,
                maxValue = (Ext.isString(dt) ? me.parseDate(dt) : dt);

            me.maxValue = maxValue;
            if (picker) {
                picker.maxText = Ext.String.format(me.maxText, me.formatDate(me.maxValue));
                picker.setMaxDate(maxValue);
            }
        },

        /**
         * Runs all of Date's validations and returns an array of any errors. Note that this first
         * runs Text's validations, so the returned array is an amalgamation of all field errors.
         * The additional validation checks are testing that the date format is valid, that the chosen
         * date is within the min and max date constraints set, that the date chosen is not in the disabledDates
         * regex and that the day chosed is not one of the disabledDays.
         * @param {Mixed} value The value to get errors for (defaults to the current field value)
         * @return {Array} All validation errors for this field
         */
        getErrors: function(value) {
            var me = this,
                format = Ext.String.format,
                clearTime = Ext.Date.clearTime,
                errors = me.callParent(arguments),
                disabledDays = me.disabledDays,
                disabledDatesRE = me.disabledDatesRE,
                minValue = me.minValue,
                maxValue = me.maxValue,
                len = disabledDays ? disabledDays.length : 0,
                i = 0,
                svalue,
                fvalue,
                day,
                time;

            value = me.formatDate(value || me.processRawValue(me.getRawValue()));

            if (value === null || value.length < 1) { // if it's blank and textfield didn't flag it then it's valid
                 return errors;
            }

            svalue = value;
            value = me.parseDate(value);
            if (!value) {
                errors.push(format(me.invalidText, svalue, me.format));
                return errors;
            }

            time = value.getTime();
            if (minValue && time < clearTime(minValue).getTime()) {
                errors.push(format(me.minText, me.formatDate(minValue)));
            }

            if (maxValue && time > clearTime(maxValue).getTime()) {
                errors.push(format(me.maxText, me.formatDate(maxValue)));
            }

            if (disabledDays) {
                day = value.getDay();

                for(; i < len; i++) {
                    if (day === disabledDays[i]) {
                        errors.push(me.disabledDaysText);
                        break;
                    }
                }
            }

            fvalue = me.formatDate(value);
            if (disabledDatesRE && disabledDatesRE.test(fvalue)) {
                errors.push(format(me.disabledDatesText, fvalue));
            }

            return errors;
        },

        rawToValue: function(rawValue) {
            return this.parseDate(rawValue) || rawValue || null;
        },

        valueToRaw: function(value) {
            return this.formatDate(this.parseDate(value));
        },

        /**
         * Sets the value of the date field.  You can pass a date object or any string that can be
         * parsed into a valid date, using <tt>{@link #format}</tt> as the date format, according
         * to the same rules as {@link Ext.Date#parse} (the default format used is <tt>"m/d/Y"</tt>).
         * <br />Usage:
         * <pre><code>
    //All of these calls set the same date value (May 4, 2006)

    //Pass a date object:
    var dt = new Date('5/4/2006');
    dateField.setValue(dt);

    //Pass a date string (default format):
    dateField.setValue('05/04/2006');

    //Pass a date string (custom format):
    dateField.format = 'Y-m-d';
    dateField.setValue('2006-05-04');
    </code></pre>
         * @param {String/Date} date The date or valid date string
         * @return {Ext.form.field.Date} this
         * @method setValue
         */

        /**
         * Attempts to parse a given string value using a given {@link Ext.Date#parse date format}.
         * @param {String} value The value to attempt to parse
         * @param {String} format A valid date format (see {@link Ext.Date#parse})
         * @return {Date} The parsed Date object, or null if the value could not be successfully parsed.
         */
        safeParse : function(value, format) {
            var me = this,
                utilDate = Ext.Date,
                parsedDate,
                result = null;

            if (utilDate.formatContainsHourInfo(format)) {
                // if parse format contains hour information, no DST adjustment is necessary
                result = utilDate.parse(value, format);
            } else {
                // set time to 12 noon, then clear the time
                parsedDate = utilDate.parse(value + ' ' + me.initTime, format + ' ' + me.initTimeFormat);
                if (parsedDate) {
                    result = utilDate.clearTime(parsedDate);
                }
            }
            return result;
        },

        // @private
        getSubmitValue: function() {
            var me = this,
                format = me.submitFormat || me.format,
                value = me.getValue();

            return value ? Ext.Date.format(value, format) : null;
        },

        /**
         * @private
         */
        parseDate : function(value) {
            if(!value || Ext.isDate(value)){
                return value;
            }

            var me = this,
                val = me.safeParse(value, me.format),
                altFormats = me.altFormats,
                altFormatsArray = me.altFormatsArray,
                i = 0,
                len;

            if (!val && altFormats) {
                altFormatsArray = altFormatsArray || altFormats.split('|');
                len = altFormatsArray.length;
                for (; i < len && !val; ++i) {
                    val = me.safeParse(value, altFormatsArray[i]);
                }
            }
            return val;
        },

        // private
        formatDate : function(date){
            return Ext.isDate(date) ? Ext.Date.dateFormat(date, this.format) : date;
        },

        createPicker: function() {
            var me = this,
                format = Ext.String.format;

            return Ext.create('Ext.picker.Date', {
                ownerCt: this.ownerCt,
                renderTo: document.body,
                floating: true,
                hidden: true,
                focusOnShow: true,
                minDate: me.minValue,
                maxDate: me.maxValue,
                disabledDatesRE: me.disabledDatesRE,
                disabledDatesText: me.disabledDatesText,
                disabledDays: me.disabledDays,
                disabledDaysText: me.disabledDaysText,
                format: me.format,
                showToday: me.showToday,
                startDay: me.startDay,
                minText: format(me.minText, me.formatDate(me.minValue)),
                maxText: format(me.maxText, me.formatDate(me.maxValue)),
                listeners: {
                    scope: me,
                    select: me.onSelect
                },
                keyNavConfig: {
                    esc: function() {
                        me.collapse();
                    }
                }
            });
        },

        onSelect: function(m, d) {
            this.setValue(d);
            this.fireEvent('select', this, d);
            this.collapse();
        },

        /**
         * @private
         * Sets the Date picker's value to match the current field value when expanding.
         */
        onExpand: function() {
            var me = this,
                value = me.getValue();
            me.picker.setValue(value instanceof Date ? value : new Date());
        },

        /**
         * @private
         * Focuses the field when collapsing the Date picker.
         */
        onCollapse: function() {
            this.focus(false, 60);
        },

        // private
        beforeBlur : function(){
            var v = this.parseDate(this.getRawValue());
            if(v){
                this.setValue(v);
            }
        }

        /**
         * @cfg {Boolean} grow @hide
         */
        /**
         * @cfg {Number} growMin @hide
         */
        /**
         * @cfg {Number} growMax @hide
         */
        /**
         * @hide
         * @method autoSize
         */
    });