EGroupware / egroupware

function date (format, timestamp) {

    // http://kevin.vanzonneveld.net

    // +   original by: Carlos R. L. Rodrigues (http://www.jsfromhell.com)

    // +      parts by: Peter-Paul Koch (http://www.quirksmode.org/js/beat.html)

    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

    // +   improved by: MeEtc (http://yass.meetcweb.com)

    // +   improved by: Brad Touesnard

    // +   improved by: Tim Wiel

    // +   improved by: Bryan Elliott

    //

    // +   improved by: Brett Zamir (http://brett-zamir.me)

    // +   improved by: David Randall

    // +      input by: Brett Zamir (http://brett-zamir.me)

    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

    // +   improved by: Brett Zamir (http://brett-zamir.me)

    // +   improved by: Brett Zamir (http://brett-zamir.me)

    // +   improved by: Theriault

    // +  derived from: gettimeofday

    // +      input by: majak

    // +   bugfixed by: majak

    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

    // +      input by: Alex

    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)

    // +   improved by: Theriault

    // +   improved by: Brett Zamir (http://brett-zamir.me)

    // +   improved by: Theriault

    // +   improved by: Thomas Beaucourt (http://www.webapp.fr)

    // +   improved by: JT

    // +   improved by: Theriault

    // +   improved by: Rafał Kukawski (http://blog.kukawski.pl)

    // +      input by: Martin

    // +      input by: Alex Wilson

    // %        note 1: Uses global: php_js to store the default timezone

    // %        note 2: Although the function potentially allows timezone info (see notes), it currently does not set

    // %        note 2: per a timezone specified by date_default_timezone_set(). Implementers might use

    // %        note 2: this.php_js.currentTimezoneOffset and this.php_js.currentTimezoneDST set by that function

    // %        note 2: in order to adjust the dates in this function (or our other date functions!) accordingly

    // *     example 1: date('H:m:s \\m \\i\\s \\m\\o\\n\\t\\h', 1062402400);

    // *     returns 1: '09:09:40 m is month'

    // *     example 2: date('F j, Y, g:i a', 1062462400);

    // *     returns 2: 'September 2, 2003, 2:26 am'

    // *     example 3: date('Y W o', 1062462400);

    // *     returns 3: '2003 36 2003'

    // *     example 4: x = date('Y m d', (new Date()).getTime()/1000);

    // *     example 4: (x+'').length == 10 // 2009 01 09

    // *     returns 4: true

    // *     example 5: date('W', 1104534000);

    // *     returns 5: '53'

    // *     example 6: date('B t', 1104534000);

    // *     returns 6: '999 31'

    // *     example 7: date('W U', 1293750000.82); // 2010-12-31

    // *     returns 7: '52 1293750000'

    // *     example 8: date('W', 1293836400); // 2011-01-01

    // *     returns 8: '52'

    // *     example 9: date('W Y-m-d', 1293974054); // 2011-01-02

    // *     returns 9: '52 2011-01-02'

    var that = this,

        jsdate, f, formatChr = /\\?([a-z])/gi,

        formatChrCb,

        // Keep this here (works, but for code commented-out

        // below for file size reasons)

        //, tal= [],

        _pad = function (n, c) {

            if ((n = n + '').length < c) {

                return new Array((++c) - n.length).join('0') + n;

            }

            return n;

        },

        txt_words = ["Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

    formatChrCb = function (t, s) {

        return f[t] ? f[t]() : s;

    };

    f = {

        // Day

        d: function () { // Day of month w/leading 0; 01..31

            return _pad(f.j(), 2);

        },

        D: function () { // Shorthand day name; Mon...Sun

            return f.l().slice(0, 3);

        },

        j: function () { // Day of month; 1..31

            return jsdate.getDate();

        },

        l: function () { // Full day name; Monday...Sunday

            return egw && egw.lang ? egw.lang(txt_words[f.w()] + 'day') : txt_words[f.w()] + 'day';

        },

        N: function () { // ISO-8601 day of week; 1[Mon]..7[Sun]

            return f.w() || 7;

        },

        S: function () { // Ordinal suffix for day of month; st, nd, rd, th

            var j = f.j();

            return j > 4 || j < 21 ? 'th' : {1: 'st', 2: 'nd', 3: 'rd'}[j % 10] || 'th';

        },

        w: function () { // Day of week; 0[Sun]..6[Sat]

            return jsdate.getDay();

        },

        z: function () { // Day of year; 0..365

            var a = new Date(f.Y(), f.n() - 1, f.j()),

                b = new Date(f.Y(), 0, 1);

            return Math.round((a - b) / 864e5) + 1;

        },

        // Week

        W: function () { // ISO-8601 week number

            var a = new Date(f.Y(), f.n() - 1, f.j() - f.N() + 3),

                b = new Date(a.getFullYear(), 0, 4);

            return _pad(1 + Math.round((a - b) / 864e5 / 7), 2);

        },

        // Month

        F: function () { // Full month name; January...December

            return egw && egw.lang ? egw.lang(txt_words[6 + f.n()]) : txt_words[6 + f.n()];

        },

        m: function () { // Month w/leading 0; 01...12

            return _pad(f.n(), 2);

        },

        M: function () { // Shorthand month name; Jan...Dec

            return f.F().slice(0, 3);

        },

        n: function () { // Month; 1...12

            return jsdate.getMonth() + 1;

        },

        t: function () { // Days in month; 28...31

            return (new Date(f.Y(), f.n(), 0)).getDate();

        },

        // Year

        L: function () { // Is leap year?; 0 or 1

            return new Date(f.Y(), 1, 29).getMonth() === 1 | 0;

        },

        o: function () { // ISO-8601 year

            var n = f.n(),

                W = f.W(),

                Y = f.Y();

            return Y + (n === 12 && W < 9 ? -1 : n === 1 && W > 9);

        },

        Y: function () { // Full year; e.g. 1980...2010

            return jsdate.getFullYear();

        },

        y: function () { // Last two digits of year; 00...99

            return (f.Y() + "").slice(-2);

        },

        // Time

        a: function () { // am or pm

            return jsdate.getHours() > 11 ? "pm" : "am";

        },

        A: function () { // AM or PM

            return f.a().toUpperCase();

        },

        B: function () { // Swatch Internet time; 000..999

            var H = jsdate.getUTCHours() * 36e2,

                // Hours

                i = jsdate.getUTCMinutes() * 60,

                // Minutes

                s = jsdate.getUTCSeconds(); // Seconds

            return _pad(Math.floor((H + i + s + 36e2) / 86.4) % 1e3, 3);

        },

        g: function () { // 12-Hours; 1..12

            return f.G() % 12 || 12;

        },

        G: function () { // 24-Hours; 0..23

            return jsdate.getHours();

        },

        h: function () { // 12-Hours w/leading 0; 01..12

            return _pad(f.g(), 2);

        },

        H: function () { // 24-Hours w/leading 0; 00..23

            return _pad(f.G(), 2);

        },

        i: function () { // Minutes w/leading 0; 00..59

            return _pad(jsdate.getMinutes(), 2);

        },

        s: function () { // Seconds w/leading 0; 00..59

            return _pad(jsdate.getSeconds(), 2);

        },

        u: function () { // Microseconds; 000000-999000

            return _pad(jsdate.getMilliseconds() * 1000, 6);

        },

        // Timezone

        e: function () { // Timezone identifier; e.g. Atlantic/Azores, ...

            // The following works, but requires inclusion of the very large

            // timezone_abbreviations_list() function.

/*              return this.date_default_timezone_get();

*/

            throw 'Not supported (see source code of date() for timezone on how to add support)';

        },

        I: function () { // DST observed?; 0 or 1

            // Compares Jan 1 minus Jan 1 UTC to Jul 1 minus Jul 1 UTC.

            // If they are not equal, then DST is observed.

            var a = new Date(f.Y(), 0),

                // Jan 1

                c = Date.UTC(f.Y(), 0),

                // Jan 1 UTC

                b = new Date(f.Y(), 6),

                // Jul 1

                d = Date.UTC(f.Y(), 6); // Jul 1 UTC

            return 0 + ((a - c) !== (b - d));

        },

        O: function () { // Difference to GMT in hour format; e.g. +0200

            var a = jsdate.getTimezoneOffset();

            return (a > 0 ? "-" : "+") + _pad(Math.abs(a / 60 * 100), 4);

        },

        P: function () { // Difference to GMT w/colon; e.g. +02:00

            var O = f.O();

            return (O.substr(0, 3) + ":" + O.substr(3, 2));

        },

        T: function () { // Timezone abbreviation; e.g. EST, MDT, ...

            // The following works, but requires inclusion of the very

            // large timezone_abbreviations_list() function.

/*              var abbr = '', i = 0, os = 0, default = 0;

            if (!tal.length) {

                tal = that.timezone_abbreviations_list();

            }

            if (that.php_js && that.php_js.default_timezone) {

                default = that.php_js.default_timezone;

                for (abbr in tal) {

                    for (i=0; i < tal[abbr].length; i++) {

                        if (tal[abbr][i].timezone_id === default) {

                            return abbr.toUpperCase();

                        }

                    }

                }

            }

            for (abbr in tal) {

                for (i = 0; i < tal[abbr].length; i++) {

                    os = -jsdate.getTimezoneOffset() * 60;

                    if (tal[abbr][i].offset === os) {

                        return abbr.toUpperCase();

                    }

                }

            }

*/

            return 'UTC';

        },

        Z: function () { // Timezone offset in seconds (-43200...50400)

            return -jsdate.getTimezoneOffset() * 60;

        },

        // Full Date/Time

        c: function () { // ISO-8601 date.

            return 'Y-m-d\\Th:i:sP'.replace(formatChr, formatChrCb);

        },

        r: function () { // RFC 2822

            return 'D, d M Y H:i:s O'.replace(formatChr, formatChrCb);

        },

        U: function () { // Seconds since UNIX epoch

            return jsdate.getTime() / 1000 | 0;

        }

    };

    this.date = function (format, timestamp) {

        that = this;

        jsdate = ((typeof timestamp === 'undefined' ||isNaN(timestamp.valueOf())) ? new Date() : // Not provided

        (timestamp instanceof Date) ? new Date(timestamp) : // JS Date()

        new Date(timestamp * 1000) // UNIX timestamp (auto-convert to int)

        );

        return format.replace(formatChr, formatChrCb);

    };

    return this.date(format, timestamp);

}