极湖

/* Date/Time Format v0.2; MIT-style license
By Steven Levithan <http://stevenlevithan.com> */

Date.prototype.format = function(mask) {
    var d = this; // Needed for the replace() closure
    
    // If preferred, zeroise() can be moved out of the format() method for performance and reuse purposes
    var zeroize = function (value, length) {
        if (!length) length = 2;
        value = String(value);
        for (var i = 0, zeros = ''; i < (length - value.length); i++) {
            zeros += '0';
        }
        return zeros + value;
    };
    
    return mask.replace(/"[^"]*"|'[^']*'|\b(?:d{1,4}|m{1,4}|yy(?:yy)?|([hHMs])\1?|TT|tt|[lL])\b/g, function($0) {
        switch($0) {
            case 'd':   return d.getDate();
            case 'dd':  return zeroize(d.getDate());
            case 'ddd': return ['Sun','Mon','Tue','Wed','Thr','Fri','Sat'][d.getDay()];
            case 'dddd':    return ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'][d.getDay()];
            case 'm':   return d.getMonth() + 1;
            case 'mm':  return zeroize(d.getMonth() + 1);
            case 'mmm': return ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'][d.getMonth()];
            case 'mmmm':    return ['January','February','March','April','May','June','July','August','September','October','November','December'][d.getMonth()];
            case 'yy':  return String(d.getFullYear()).substr(2);
            case 'yyyy':    return d.getFullYear();
            case 'h':   return d.getHours() % 12 || 12;
            case 'hh':  return zeroize(d.getHours() % 12 || 12);
            case 'H':   return d.getHours();
            case 'HH':  return zeroize(d.getHours());
            case 'M':   return d.getMinutes();
            case 'MM':  return zeroize(d.getMinutes());
            case 's':   return d.getSeconds();
            case 'ss':  return zeroize(d.getSeconds());
            case 'l':   return zeroize(d.getMilliseconds(), 3);
            case 'L':   var m = d.getMilliseconds();
                    if (m > 99) m = Math.round(m / 10);
                    return zeroize(m);
            case 'tt':  return d.getHours() < 12 ? 'am' : 'pm';
            case 'TT':  return d.getHours() < 12 ? 'AM' : 'PM';
            // Return quoted strings with the surrounding quotes removed
            default:    return $0.substr(1, $0.length - 2);
        }
    });
};