Simulates PHP's date function

Description

Demo Code

/**//from   w w  w  . ja  va2  s  .  c  o  m
Copyright (c) 2005 Jacob Wright

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
 */
(function() {
    
    Date.shortMonths = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
    Date.longMonths = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
    Date.shortDays = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
    Date.longDays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
    
    // defining patterns
    var replaceChars = {
        // Day
        d: function() { return (this.getDate() < 10 ? '0' : '') + this.getDate(); },
        D: function() { return Date.shortDays[this.getDay()]; },
        j: function() { return this.getDate(); },
        l: function() { return Date.longDays[this.getDay()]; },
        N: function() { return this.getDay() + 1; },
        S: function() { return (this.getDate() % 10 == 1 && this.getDate() != 11 ? 'st' : (this.getDate() % 10 == 2 && this.getDate() != 12 ? 'nd' : (this.getDate() % 10 == 3 && this.getDate() != 13 ? 'rd' : 'th'))); },
        w: function() { return this.getDay(); },
        z: function() { var d = new Date(this.getFullYear(),0,1); return Math.ceil((this - d) / 86400000); }, // Fixed now
        // Week
        W: function() { var d = new Date(this.getFullYear(), 0, 1); return Math.ceil((((this - d) / 86400000) + d.getDay() + 1) / 7); }, // Fixed now
        // Month
        F: function() { return Date.longMonths[this.getMonth()]; },
        m: function() { return (this.getMonth() < 9 ? '0' : '') + (this.getMonth() + 1); },
        M: function() { return Date.shortMonths[this.getMonth()]; },
        n: function() { return this.getMonth() + 1; },
        t: function() { var d = new Date(); return new Date(d.getFullYear(), d.getMonth(), 0).getDate() }, // Fixed now, gets #days of date
        // Year
        L: function() { var year = this.getFullYear(); return (year % 400 == 0 || (year % 100 != 0 && year % 4 == 0)); },   // Fixed now
        o: function() { var d  = new Date(this.valueOf());  d.setDate(d.getDate() - ((this.getDay() + 6) % 7) + 3); return d.getFullYear();}, //Fixed now
        Y: function() { return this.getFullYear(); },
        y: function() { return ('' + this.getFullYear()).substr(2); },
        // Time
        a: function() { return this.getHours() < 12 ? 'am' : 'pm'; },
        A: function() { return this.getHours() < 12 ? 'AM' : 'PM'; },
        B: function() { return Math.floor((((this.getUTCHours() + 1) % 24) + this.getUTCMinutes() / 60 + this.getUTCSeconds() / 3600) * 1000 / 24); }, // Fixed now
        g: function() { return this.getHours() % 12 || 12; },
        G: function() { return this.getHours(); },
        h: function() { return ((this.getHours() % 12 || 12) < 10 ? '0' : '') + (this.getHours() % 12 || 12); },
        H: function() { return (this.getHours() < 10 ? '0' : '') + this.getHours(); },
        i: function() { return (this.getMinutes() < 10 ? '0' : '') + this.getMinutes(); },
        s: function() { return (this.getSeconds() < 10 ? '0' : '') + this.getSeconds(); },
        u: function() { var m = this.getMilliseconds(); return (m < 10 ? '00' : (m < 100 ? '0' : '')) + m; },
        // Timezone
        e: function() { return "Not Yet Supported"; },
        I: function() {
            var DST = null;
                for (var i = 0; i < 12; ++i) {
                        var d = new Date(this.getFullYear(), i, 1);
                        var offset = d.getTimezoneOffset();
    
                        if (DST === null) DST = offset;
                        else if (offset < DST) { DST = offset; break; }                     else if (offset > DST) break;
                }
                return (this.getTimezoneOffset() == DST) | 0;
            },
        O: function() { return (-this.getTimezoneOffset() < 0 ? '-' : '+') + (Math.abs(this.getTimezoneOffset() / 60) < 10 ? '0' : '') + (Math.abs(this.getTimezoneOffset() / 60)) + '00'; },
        P: function() { return (-this.getTimezoneOffset() < 0 ? '-' : '+') + (Math.abs(this.getTimezoneOffset() / 60) < 10 ? '0' : '') + (Math.abs(this.getTimezoneOffset() / 60)) + ':00'; }, // Fixed now
        T: function() { var m = this.getMonth(); this.setMonth(0); var result = this.toTimeString().replace(/^.+ \(?([^\)]+)\)?$/, '$1'); this.setMonth(m); return result;},
        Z: function() { return -this.getTimezoneOffset() * 60; },
        // Full Date/Time
        c: function() { return this.format("Y-m-d\\TH:i:sP"); }, // Fixed now
        r: function() { return this.toString(); },
        U: function() { return this.getTime() / 1000; }
    };

    // Simulates PHP's date function
    Date.prototype.format = function(format) {
        var date = this;
        return format.replace(/(\\?)(.)/g, function(_, esc, chr) {
            return (esc === '' && replaceChars[chr]) ? replaceChars[chr].call(date) : chr;
        });
    };

}).call(this);
Simulates PHP's date function - Node.js Date

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