Edit: strptime

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Description:	Parse a time/date generated with strftime().

Edit function

Code:	function strptime (dateStr, format) { // http://jsphp.co/jsphp/fn/view/strptime // + original by: Brett Zamir (http://brett-zamir.me) // + based on: strftime // - depends on: setlocale // - depends on: array_map // * example 1: strptime('20091112222135', '%Y%m%d%H%M%S'); // Return value will depend on date and locale // * returns 1: {tm_sec: 35, tm_min: 21, tm_hour: 22, tm_mday: 12, tm_mon: 10, tm_year: 109, tm_wday: 4, tm_yday: 315, unparsed: ''} // * example 1: strptime('2009extra', '%Y'); // * returns 1: {tm_sec:0, tm_min:0, tm_hour:0, tm_mday:0, tm_mon:0, tm_year:109, tm_wday:3, tm_yday: -1, unparsed: 'extra'} // tm_isdst is in other docs; why not PHP? // Needs more thorough testing and examples var retObj = { tm_sec: 0, tm_min: 0, tm_hour: 0, tm_mday: 0, tm_mon: 0, tm_year: 0, tm_wday: 0, tm_yday: 0, unparsed: '' }, that = this, amPmOffset = 0, prevHour = false, _date = function () { var o = retObj; // We set date to at least 1 to ensure year or month doesn't go backwards return _reset(new Date(Date.UTC(o.tm_year + 1900, o.tm_mon, o.tm_mday || 1, o.tm_hour, o.tm_min, o.tm_sec)), o.tm_mday); }, _reset = function (dateObj, realMday) { // realMday is to allow for a value of 0 in return results (but without // messing up the Date() object) var o = retObj; var d = dateObj; o.tm_sec = d.getUTCSeconds(); o.tm_min = d.getUTCMinutes(); o.tm_hour = d.getUTCHours(); o.tm_mday = realMday === 0 ? realMday : d.getUTCDate(); o.tm_mon = d.getUTCMonth(); o.tm_year = d.getUTCFullYear() - 1900; o.tm_wday = realMday === 0 ? (d.getUTCDay() > 0 ? d.getUTCDay() - 1 : 6) : d.getUTCDay(); var jan1 = new Date(Date.UTC(d.getUTCFullYear(), 0, 1)); o.tm_yday = Math.ceil((d - jan1) / (1000 * 60 * 60 * 24)); }; // BEGIN STATIC var _NWS = /\S/, _WS = /\s/; var _aggregates = { c: 'locale', D: '%m/%d/%y', F: '%y-%m-%d', r: 'locale', R: '%H:%M', T: '%H:%M:%S', x: 'locale', X: 'locale' }; /* Fix: Locale alternatives are supported though not documented in PHP; see http://linux.die.net/man/3/strptime Ec EC Ex EX Ey EY Od or Oe OH OI Om OM OS OU Ow OW Oy */ var _preg_quote = function (str) { return (str + '').replace(/([\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!<>\|\:])/g, '\\$1'); }; // END STATIC // 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; var locale = phpjs.localeCategories.LC_TIME; var locales = phpjs.locales; var lc_time = locales[locale].LC_TIME; // First replace aggregates (run in a loop because an agg may be made up of other aggs) while (format.match(/%[cDFhnrRtTxX]/)) { format = format.replace(/%([cDFhnrRtTxX])/g, function (m0, m1) { var f = _aggregates[m1]; return (f === 'locale' ? lc_time[m1] : f); }); } var _addNext = function (j, regex, cb) { if (typeof regex === 'string') { regex = new RegExp('^' + regex, 'i'); } var check = dateStr.slice(j); var match = regex.exec(check); // Even if the callback returns null after assigning to the return object, the object won't be saved anyways var testNull = match ? cb.apply(null, match) : null; if (testNull === null) { throw 'No match in string'; } return j + match[0].length; }; var _addLocalized = function (j, formatChar, category) { return _addNext(j, that.array_map( _preg_quote, lc_time[formatChar]).join('|'), // Could make each parenthesized instead and pass index to callback function (m) { var match = lc_time[formatChar].search(new RegExp('^' + _preg_quote(m) + '$', 'i')); if (match) { retObj[category] = match[0]; } }); }; // BEGIN PROCESSING CHARACTERS for (var i = 0, j = 0; i < format.length; i++) { if (format.charAt(i) === '%') { var literalPos = ['%', 'n', 't'].indexOf(format.charAt(i + 1)); if (literalPos !== -1) { if (['%', '\n', '\t'].indexOf(dateStr.charAt(j)) === literalPos) { // a matched literal ++i, ++j; // skip beyond continue; } // Format indicated a percent literal, but not actually present return false; } var formatChar = format.charAt(i + 1); try { switch (formatChar) { case 'a': // Fall-through // Sun-Sat case 'A': // Sunday-Saturday j = _addLocalized(j, formatChar, 'tm_wday'); // Changes nothing else break; case 'h': // Fall-through (alias of 'b'); case 'b': // Jan-Dec j = _addLocalized(j, 'b', 'tm_mon'); _date(); // Also changes wday, yday break; case 'B': // January-December j = _addLocalized(j, formatChar, 'tm_mon'); _date(); // Also changes wday, yday break; case 'C': // 0+; century (19 for 20th) j = _addNext(j, /^\d?\d/, // PHP docs say two-digit, but accepts one-digit (two-digit max) function (d) { var year = (parseInt(d, 10) - 19) * 100; retObj.tm_year = year; _date(); if (!retObj.tm_yday) { retObj.tm_yday = -1; } // Also changes wday; and sets yday to -1 (always?) }); break; case 'd': // Fall-through 01-31 day case 'e': // 1-31 day j = _addNext(j, formatChar === 'd' ? /^(0[1-9]|[1-2]\d|3[0-1])/ : /^([1-2]\d|3[0-1]|[1-9])/, function (d) { var dayMonth = parseInt(d, 10); retObj.tm_mday = dayMonth; _date(); // Also changes w_day, y_day }); break; case 'g': // No apparent effect; 2-digit year (see 'V') break; case 'G': // No apparent effect; 4-digit year (see 'V')' break; case 'H': // 00-23 hours j = _addNext(j, /^([0-1]\d|2[0-3])/, function (d) { var hour = parseInt(d, 10); retObj.tm_hour = hour; // Changes nothing else }); break; case 'l': // Fall-through of lower-case 'L'; 1-12 hours case 'I': // 01-12 hours j = _addNext(j, formatChar === 'l' ? /^([1-9]|1[0-2])/ : /^(0[1-9]|1[0-2])/, function (d) { var hour = parseInt(d, 10) - 1 + amPmOffset; retObj.tm_hour = hour; prevHour = true; // Used for coordinating with am-pm // Changes nothing else, but affected by prior 'p/P' }); break; case 'j': // 001-366 day of year j = _addNext(j, /^(00[1-9]|0[1-9]\d|[1-2]\d\d|3[0-6][0-6])/, function (d) { var dayYear = parseInt(d, 10) - 1; retObj.tm_yday = dayYear; // Changes nothing else (oddly, since if based on a given year, could calculate other fields) }); break; case 'm': // 01-12 month j = _addNext(j, /^(0[1-9]|1[0-2])/, function (d) { var month = parseInt(d, 10) - 1; retObj.tm_mon = month; _date(); // Also sets wday and yday }); break; case 'M': // 00-59 minutes j = _addNext(j, /^[0-5]\d/, function (d) { var minute = parseInt(d, 10); retObj.tm_min = minute; // Changes nothing else }); break; case 'P': // Seems not to work; AM-PM return false; // Could make fall-through instead since supposed to be a synonym despite PHP docs case 'p': // am-pm j = _addNext(j, /^(am|pm)/i, function (d) { // No effect on 'H' since already 24 hours but // works before or after setting of l/I hour amPmOffset = (/a/).test(d) ? 0 : 12; if (prevHour) { retObj.tm_hour += amPmOffset; } }); break; case 's': // Unix timestamp (in seconds) j = _addNext(j, /^\d+/, function (d) { var timestamp = parseInt(d, 10); var date = new Date(Date.UTC(timestamp * 1000)); _reset(date); // Affects all fields, but can't be negative (and initial + not allowed) }); break; case 'S': // 00-59 seconds j = _addNext(j, /^[0-5]\d/, // strptime also accepts 60-61 for some reason function (d) { var second = parseInt(d, 10); retObj.tm_sec = second; // Changes nothing else }); break; case 'u': // Fall-through; 1 (Monday)-7(Sunday) case 'w': // 0 (Sunday)-6(Saturday) j = _addNext(j, /^\d/, function (d) { retObj.tm_wday = d - (formatChar === 'u'); // Changes nothing else apparently }); break; case 'U': // Fall-through (week of year, from 1st Sunday) case 'V': // Fall-through (ISO-8601:1988 week number; from first 4-weekday week, starting with Monday) case 'W': // Apparently ignored (week of year, from 1st Monday) break; case 'y': // 69 (or higher) for 1969+, 68 (or lower) for 2068- j = _addNext(j, /^\d?\d/, // PHP docs say two-digit, but accepts one-digit (two-digit max) function (d) { d = parseInt(d, 10); var year = d >= 69 ? d : d + 100; retObj.tm_year = year; _date(); if (!retObj.tm_yday) { retObj.tm_yday = -1; } // Also changes wday; and sets yday to -1 (always?) }); break; case 'Y': // 2010 (4-digit year) j = _addNext(j, /^\d{1,4}/, // PHP docs say four-digit, but accepts one-digit (four-digit max) function (d) { var year = (parseInt(d, 10)) - 1900; retObj.tm_year = year; _date(); if (!retObj.tm_yday) { retObj.tm_yday = -1; } // Also changes wday; and sets yday to -1 (always?) }); break; case 'z': // Timezone; on my system, strftime gives -0800, but strptime seems not to alter hour setting break; case 'Z': // Timezone; on my system, strftime gives PST, but strptime treats text as unparsed break; default: throw 'Unrecognized formatting character in strptime()'; break; } } catch (e) { if (e === 'No match in string') { // Allow us to exit return false; // There was supposed to be a matching format but there wasn't } }++i; // Calculate skipping beyond initial percent too } else if (format.charAt(i) !== dateStr.charAt(j)) { // If extra whitespace at beginning or end of either, or between formats, no problem // (just a problem when between % and format specifier) // If the string has white-space, it is ok to ignore if (dateStr.charAt(j).search(_WS) !== -1) { j++; i--; // Let the next iteration try again with the same format character } else if (format.charAt(i).search(_NWS) !== -1) { // Any extra formatting characters besides white-space causes // problems (do check after WS though, as may just be WS in string before next character) return false; } else { // Extra WS in format // Adjust strings when encounter non-matching whitespace, so they align in future checks above // Will check on next iteration (against same (non-WS) string character) } } else { j++; } } // POST-PROCESSING retObj.unparsed = dateStr.slice(j); // Will also get extra whitespace; empty string if none return retObj; }
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