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              <h1>MomentJS Date Validation Demo</h1>
<label for="start">Start Date:</label>
<input id="start" name="start" type="date" placeholder="yyyy-mm-dd" value="">

<label for="end">End Date:</label>
<input id="end" name="end" type="date" placeholder="yyyy-mm-dd" value="">

<div id="out1"></div>

<br/>
<hr color=red />
<p>If you find this demo useful, please consider <a href="https://paypal.me/RobertGravelle/1" target="_blank">donating $1 dollar</a> (secure PayPal link) for a coffee or purchasing one of my songs from <a href="https://ax.itunes.apple.com/WebObjects/MZSearch.woa/wa/search?term=rob%20gravelle" target="_blank">iTunes.com</a> or <a href="http://www.amazon.com/s/ref=ntt_srch_drd_B001ES9TTK?ie=UTF8&field-keywords=Rob%20Gravelle&index=digital-music&search-type=ss" target="_blank">Amazon.com</a> for only 0.99 cents each. </p>
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!
            
              Date.getFormattedDateDiff = function(start, end) {
  var intervals = ['years','months','weeks','days'],
      out = [];
  
  if (!moment.isMoment(start)) start = moment(start);
  if (!moment.isMoment(end))   end   = moment(end);
  
  for(var i=0; i<intervals.length; i++){
      var diff = end.diff(start, intervals[i]);
      start.add(diff, intervals[i]);
      out.push(diff + ' ' + intervals[i]);
  }
  return out.join(', ');
};

function calculateInterval() {
   var start      = document.getElementById('start'),
       end        = document.getElementById('end'),
       datesInfo  = validateDates({
         id:  start.id,
         val: start.value
        }, {
         id:  end.id,
         val: end.value
       }),
       out        = '';
   
   start = moment(start.value);
   end   = moment(end.value);
   if ( datesInfo === true ) {
     out = 'Time elapsed between "' + start.toISOString().split('T')[0]
         + '" and "' + end.toISOString().split('T')[0] + '":<br/>' 
         + Date.getFormattedDateDiff(start, end);
   }
   else {
     out = datesInfo.msgs.join('<br/>');
     with (document.getElementById(datesInfo.eltId)) {
       focus();
       select();
     }
   }
   
   return out;
}

function validateDates() {
  var dates     = Array.prototype.slice.call(arguments),
      errs      = {
        eltId: '',
        msgs:  []
      },
      dateParts = ['year',
                   'month',
                   'day',
                   'hour',
                   'minute',
                   'seconds',
                   'milliseconds'],
      isValid = dates.every(function(date) {
        var aDate = moment(date.val, 'YYYY-MM-DD', true);

        if ( aDate.isValid() ) { 
          return true; 
        }
        else { //get more info
          errs.eltId        = date.id;
          errs.msgs[0]     = "There were errors in the date '" + date.val + "':";
          var parsingFlags = aDate.parsingFlags();

          //overflow: An overflow of a date field, such as a 13th month, a 32nd day of the month 
          //(or a 29th of February on non-leap years), a 367th day of the year, etc. 
          //overflow contains the index of the invalid unit to match #invalidAt 
          //-1 means no overflow.
          if (parsingFlags.overflow > -1)
            errs.msgs.push('Invalid ' + dateParts[parsingFlags.overflow] + '.');
          //invalidMonth: An invalid month name, such as moment('Marbruary', 'MMMM');. 
          //Contains the invalid month string itself, or else null.
          if (parsingFlags.invalidMonth)
            errs.msgs.push("'" + parsingFlags.invalidMonth + "' is an invalid month name.");
          //empty: An input string that contains nothing parsable,
          //such as moment('this is nonsense');. Boolean.   
          if (parsingFlags.empty)
            errs.msgs.push("A required date was missing or unparsable.");
          //nullInput: A null input, like moment(null);. Boolean.
          if (parsingFlags.nullInput)
            errs.msgs.push("You supplied a null value.");
          //invalidFormat: An empty list of formats, such as moment('2013-05-25', []). Boolean.
          if (parsingFlags.invalidFormat)
            errs.msgs.push("The following formats were empty: " + parsingFlags.invalidFormat);
          //userInvalidated: A date created explicitly as invalid, 
          //such as moment.invalid(). Boolean.
          if (parsingFlags.userInvalidated)
            errs.msgs.push("A date was created explicitly as invalid.");
          //unusedTokens: array of format substrings not found in the input string
          if (parsingFlags.unusedTokens.length)
            errs.msgs.push("The following date parts were not found in the input string: " + parsingFlags.unusedTokens);
          //unusedInput: array of input substrings not matched to the format string
          if (parsingFlags.unusedInput.length)
            errs.msgs.push("The following input was not utilized: " + parsingFlags.unusedInput); 

          return false;
        }
      });
  
  return isValid || errs;
}

function testDates(startDate, endDate) {
  var p = document.createElement('p');
    
  start.value = startDate;
  end.value   = endDate;
  p.innerHTML = '<strong>Testing "' + startDate + '" and "' 
              + endDate + '</strong>":<br/>' + calculateInterval();
  out.appendChild(p);
}

//test each scenario
var start   = document.getElementById('start'),
    end     = document.getElementById('end'),
    out     = document.getElementById('out1'),
    today   = moment(new Date()).format('YYYY-MM-DD'),
    newYear = moment(new Date((new Date()).getFullYear(),0, 1)).format('YYYY-MM-DD'),
    y2k     = moment(new Date(2000, 0, 1)).format('YYYY-MM-DD');

//2 valid dates
testDates(newYear, today);

//overflow
testDates(newYear, '2017-02-30');

//parsingFlags.empty
testDates(newYear, 'bad date!');
            
          
!
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