JavaScript strftime
Format a local time/date according to locale settings
1 2 3 4 56 7 8 9 1011 12 13 14 1516 17 18 19 2021 22 23 24 2526 27 28 29 3031 32 33 34 3536 37 38 39 4041 42 43 44 4546 47 48 49 5051 52 53 54 5556 57 58 59 6061 62 63 64 6566 67 68 69 7071 72 73 74 7576 77 78 79 8081 82 83 84 8586 87 88 89 9091 92 93 94 9596 97 98 99 100101 102 103 104 105106 107 108 109 110111 112 113 114 115116 117 118 119 120121 122 123 124 125126 127 128 129 130131 132 133 134 135136 137 138 139 140141 142 143 144 145146 147 148 149 150151 152 153 154 155156 157 158 159 160161 162 163 164 165166 167 168 169 170171 172 173 174 175176 177 178 179 180181 182 183 184 185186 187 188 189 190191 192 193 194 195196 197 198 199 200201 202 203 204 205206 207 208 209 210211 212 213 214 215216 217 218 219 220221 222 | function strftime (fmt, timestamp) { // Format a local time/date according to locale settings // // version: 1109.2015 // discuss at: http://phpjs.org/functions/strftime // + original by: Blues (http://tech.bluesmoon.info/) // + reimplemented by: Brett Zamir (http://brett-zamir.me) // + input by: Alex // + bugfixed by: Brett Zamir (http://brett-zamir.me) // + improved by: Brett Zamir (http://brett-zamir.me) // - depends on: setlocale // % note 1: Uses global: php_js to store locale info // * example 1: strftime("%A", 1062462400); // Return value will depend on date and locale // * returns 1: 'Tuesday' // BEGIN REDUNDANT this.php_js = this.php_js || {}; this.setlocale('LC_ALL', 0); // ensure setup of localization variables takes place // END REDUNDANT var phpjs = this.php_js; // BEGIN STATIC var _xPad = function (x, pad, r) { if (typeof r === 'undefined') { r = 10; } for (; parseInt(x, 10) < r && r > 1; r /= 10) { x = pad.toString() + x; } return x.toString(); }; var locale = phpjs.localeCategories.LC_TIME; var locales = phpjs.locales; var lc_time = locales[locale].LC_TIME; var _formats = { a: function (d) { return lc_time.a[d.getDay()]; }, A: function (d) { return lc_time.A[d.getDay()]; }, b: function (d) { return lc_time.b[d.getMonth()]; }, B: function (d) { return lc_time.B[d.getMonth()]; }, C: function (d) { return _xPad(parseInt(d.getFullYear() / 100, 10), 0); }, d: ['getDate', '0'], e: ['getDate', ' '], g: function (d) { return _xPad(parseInt(this.G(d) / 100, 10), 0); }, G: function (d) { var y = d.getFullYear(); var V = parseInt(_formats.V(d), 10); var W = parseInt(_formats.W(d), 10); if (W > V) { y++; } else if (W === 0 && V >= 52) { y--; } return y; }, H: ['getHours', '0'], I: function (d) { var I = d.getHours() % 12; return _xPad(I === 0 ? 12 : I, 0); }, j: function (d) { var ms = d - new Date('' + d.getFullYear() + '/1/1 GMT'); ms += d.getTimezoneOffset() * 60000; // Line differs from Yahoo implementation which would be equivalent to replacing it here with: // ms = new Date('' + d.getFullYear() + '/' + (d.getMonth()+1) + '/' + d.getDate() + ' GMT') - ms; var doy = parseInt(ms / 60000 / 60 / 24, 10) + 1; return _xPad(doy, 0, 100); }, k: ['getHours', '0'], // not in PHP, but implemented here (as in Yahoo) l: function (d) { var l = d.getHours() % 12; return _xPad(l === 0 ? 12 : l, ' '); }, m: function (d) { return _xPad(d.getMonth() + 1, 0); }, M: ['getMinutes', '0'], p: function (d) { return lc_time.p[d.getHours() >= 12 ? 1 : 0]; }, P: function (d) { return lc_time.P[d.getHours() >= 12 ? 1 : 0]; }, s: function (d) { // Yahoo uses return parseInt(d.getTime()/1000, 10); return Date.parse(d) / 1000; }, S: ['getSeconds', '0'], u: function (d) { var dow = d.getDay(); return ((dow === 0) ? 7 : dow); }, U: function (d) { var doy = parseInt(_formats.j(d), 10); var rdow = 6 - d.getDay(); var woy = parseInt((doy + rdow) / 7, 10); return _xPad(woy, 0); }, V: function (d) { var woy = parseInt(_formats.W(d), 10); var dow1_1 = (new Date('' + d.getFullYear() + '/1/1')).getDay(); // First week is 01 and not 00 as in the case of %U and %W, // so we add 1 to the final result except if day 1 of the year // is a Monday (then %W returns 01). // We also need to subtract 1 if the day 1 of the year is // Friday-Sunday, so the resulting equation becomes: var idow = woy + (dow1_1 > 4 || dow1_1 <= 1 ? 0 : 1); if (idow === 53 && (new Date('' + d.getFullYear() + '/12/31')).getDay() < 4) { idow = 1; } else if (idow === 0) { idow = _formats.V(new Date('' + (d.getFullYear() - 1) + '/12/31')); } return _xPad(idow, 0); }, w: 'getDay', W: function (d) { var doy = parseInt(_formats.j(d), 10); var rdow = 7 - _formats.u(d); var woy = parseInt((doy + rdow) / 7, 10); return _xPad(woy, 0, 10); }, y: function (d) { return _xPad(d.getFullYear() % 100, 0); }, Y: 'getFullYear', z: function (d) { var o = d.getTimezoneOffset(); var H = _xPad(parseInt(Math.abs(o / 60), 10), 0); var M = _xPad(o % 60, 0); return (o > 0 ? '-' : '+') + H + M; }, Z: function (d) { return d.toString().replace(/^.*\(([^)]+)\)$/, '$1'); /* // Yahoo's: Better? var tz = d.toString().replace(/^.*:\d\d( GMT[+-]\d+)? \(?([A-Za-z ]+)\)?\d*$/, '$2').replace(/[a-z ]/g, ''); if(tz.length > 4) { tz = Dt.formats.z(d); } return tz; */ }, '%': function (d) { return '%'; } }; // END STATIC/* Fix: Locale alternatives are supported though not documented in PHP; see http://linux.die.net/man/3/strptime Ec EC Ex EXEy EY Od or Oe OH OIOm OM OS OU OwOW Oy */ var _date = ((typeof(timestamp) == 'undefined') ? new Date() : // Not provided (typeof(timestamp) == 'object') ? new Date(timestamp) : // Javascript Date() new Date(timestamp * 1000) // PHP API expects UNIX timestamp (auto-convert to int) ); var _aggregates = { c: 'locale', D: '%m/%d/%y', F: '%y-%m-%d', h: '%b', n: '\n', r: 'locale', R: '%H:%M', t: '\t', T: '%H:%M:%S', x: 'locale', X: 'locale' }; // First replace aggregates (run in a loop because an agg may be made up of other aggs) while (fmt.match(/%[cDFhnrRtTxX]/)) { fmt = fmt.replace(/%([cDFhnrRtTxX])/g, function (m0, m1) { var f = _aggregates[m1]; return (f === 'locale' ? lc_time[m1] : f); }); } // Now replace formats - we need a closure so that the date object gets passed through var str = fmt.replace(/%([aAbBCdegGHIjklmMpPsSuUVwWyYzZ%])/g, function (m0, m1) { var f = _formats[m1]; if (typeof f === 'string') { return _date[f](); } else if (typeof f === 'function') { return f(_date); } else if (typeof f === 'object' && typeof(f[0]) === 'string') { return _xPad(_date[f[0]](), f[1]); } else { // Shouldn't reach here return m1; } }); return str; } |
Examples
Running
1 | strftime("%A", 1062462400); // Return value will depend on date and locale |
Should return
1 | 'Tuesday' |
Dependencies
In order to use this function, you also need:
Open syntax issues
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Authors
Thanks to the following developers, you get to have strftime goodness in JavaScript.

Kaushik
9 Nov '11