Extract date from a string

Supported: Y-M-D M/D/Y M.D.Y Y/M/D (if Y > 31) Y.M.D (if Y > 31) M-D-Y (if Y > 31) D/M-Y

HTML

<script>
var dates = [{ "name" : "PHISH Reba Comcast Center Hartford CT. 6/18/2010" },{ "name" : "Phish - Destiny Unbound 1991 Telluride" },{ "name" : "Phish 1991-11-30 Harry Hood" },{ "name" : "Phish - Harry Hood - November 30, 1991" },{ "name" : "Phish - It's Ice - November 30, 1991" },{ "name" : "PHISH - 11.30.91 BOUNCING AROUND THE ROOM" },{ "name" : "PHISH - 11.30.91 Harry Hood" },{ "name" : "PHISH - 11.30.91 It's ICE" },{ "name" : "Phish - My Sweet One/Horn - November 30, 1991" },{ "name" : "PHISH - 11.30.91 HORN" },{ "name" : "Phish - My Sweet One/Horn - November 30, 1991" },{ "name" : "PHISH - 11.30.91 I didn't know" },{ "name" : "Phish/Worcester,MA 12-31-91 \"Llama\" (photo montage)" },{ "name" : "Phish 1991-11-30 My Sweet One, Port Chester, NY" },{ "name" : "Cavern - Phish" },{ "name" : "Phish -- Suzy Greenberg 2/25/93" },{ "name" : "Phish - David Bowie 2/25/93" },{ "name" : "PHISH - 02 - Fast Enough For You" },{ "name" : "Phish 1993-2-25 If I Only Had a Brain w/ Mimi on Vac" },{ "name" : "Phish-Good Times Bad Times, 1993/2/25" },{ "name" : "Phish Foam Madison Square Garden 01/01/2011 [HD iPhone]" },{ "name" : "Phish: Foam [HD] 2011-01-01 - New York, NY" },{ "name" : "Phish | 01.01.11 | Foam" },{ "name" : "Phish: Tube / Runaway Jim [HD] 2011-01-01 - New York, NY" },{ "name" : "Phish \"Runaway Jim\" @ MSG on January 1, 2011" },{ "name" : "Phish | 01.01.11 | Runaway Jim" },{ "name" : "Phish My Soul Madison Square Garden 01/01/11 [HD]" },{ "name" : "Phish | 01.01.11 | My Soul" },{ "name" : "Phish: My Soul [HD] 2011-01-01 - New York, NY" },{ "name" : "Phish | 01.01.11 | Tube" },{ "name" : "Phish: Tube / Runaway Jim [HD] 2011-01-01 - New York, NY" },{ "name" : "Phish: Guelah Papyrus [HD] 2011-01-01 - New York, NY" },{ "name" : "Phish | 01.01.11 | Guelah Papyrus" },{ "name" : "Phish Reba Madison Square Garden 01/01/11 [HD]" },{ "name" : "Phish: Reba [HD] 2011-01-01 - New York, NY" },{ "name" : "Phish | 01.01.11 | Reba" },{ "name" : "Phish \"Reba, pt.1\"...

CSS

.pass {background:#0f0; color:#000;}
.fail {background:#f00; color:#000;}

JavaScript

function formatDate(date) {
  function lz(value,w) {
    value = value.toString();
    return "0000".slice(4-w + value.length) + value;
  }
  return [
    lz(date.getFullYear(),4),
    lz(date.getMonth()+1,2),
    lz(date.getDate(),2)
  ].join('-');
}

//RegExp with support for short (XdYdZ) and long (month_in_text day, year)
var reDate = new RegExp([
  '(?:', // Short format
    '\\b',
    '(\\d{4}|\\d{1,2})',    // field.short_value_1
    '\\s*([./-])\\s*',      // field.short_del_1
    '(\\d{1,2})',           // field.short_value_2
    '\\s*([./-])\\s*',      // field.short_del 2
    '(\\d{4}|\\d{1,2})',    // field.short_value_3
    '\\b',
  ')|(?:', // Long format
    '\\b',
    '(',                    // field.long_month
    'jan(?:uary)?|',
    'feb(?:ruary)?|',
    'mar(?:ch)?|',
    'apr(?:il)?|',
    'may|',
    'jun(?:e)?|',
    'jul(?:y)?|',
    'aug(?:ust)?|',
    'sep(?:tember)?|',
    'oct(?:ober)?|',
    'nov(?:ember)?|',
    'dec(?:ember)?',
    ')',
    '\\s+',                 // required space
    '(\\d{1,2})\\b',        // field.long_date
    '\\s*',                 // optional space
    ',?',                   // optional delimiter
    '\\s*',                 // optinal space
    '(\\d{4}|\\d{2})\\b',   // field.long_year
  ')'
].join(''),'i');


//Month names, must be 3 chars lower case.
//Used to convert month name to number.
var  monthNames = [
  'jan', 'feb', 'mar', 'apr', 'may', 'jun',
  'jul','aug', 'sep', 'oct', 'nov', 'dev'
];

    
var extractDateFromString = function(str) {
    var m = str.match(reDate);
    var date;
    if (m) {
      var idx=-1;
      //Convert array form regexp result to named variables.
      //Makes it so much easier to change the regexp wihout
      //changing the rest of the code.
      var field = {
        all : m[++idx],
        short_value_1 : m[++idx],
        short_del_1 : m[++idx],
        short_value_2 : m[++idx],
        short_del_2 : m[++idx],
        short_value_3 : m[++idx],
        long_month :...