parse raw date and get correct moment.js object

moment_parseDate.js

// http://momentjs.com/

/**
 * Creates and returns a moment object form the 'rawDate' or null in case of an invalid date
 * @param rawDate
 * @return {moment}
 */
function parseDate(rawDate){
  if(!rawDate){
    return moment.invalid();
  }

  var DATE_PATTERN = {
    GMT : /gmt/i,
    // example: FEB 07, 2016 or FEB 07, 2016 10:00 AM
    US_DATE : /^(\w{3}\s\d{1,2},\s\d{4})(\s(\d{1,2}:{0,1}){2}\s(am|pm)){0,1}?$/i,
    // example: 2016-02-07 or 2016-02-07 10:00:00
    CUSTOM_DATE : /^(\d{4}-\d{1,2}-\d{1,2})(\s(\d{1,2}:{0,1}){2,3}){0,1}?$/i,
    // example: Sun Feb 07 2016 or Sun Feb 07 2016 07:00:00
    JS_DATETIME : /^(\w{3}\s\w{3}\s\d{1,2}\s\d{4})(\s(\d{1,2}:{0,1}){3}(\s\w{3}-\d{4}){0,1}){0,1}?$/i
  };

  var momentDate = null;
  if(moment.isMoment(rawDate)) {
    momentDate = rawDate;
  } else if(
    moment.isDate(rawDate) && 
    (rawDate.getDate() >= 0)
  ) {
    momentDate = moment(rawDate);
  } else if(
    (typeof rawDate === 'string') &&
    DATE_PATTERN.GMT.test(rawDate)
  ) {
    momentDate = moment(new Date(rawDate));
  } else if(
    (typeof rawDate === 'string') &&
    (
      DATE_PATTERN.US_DATE.test(rawDate) ||
      DATE_PATTERN.CUSTOM_DATE.test(rawDate) ||
      DATE_PATTERN.JS_DATETIME.test(rawDate)
    )
  ) {
    // fix to get the correct date/time in whatever timezone
    momentDate = moment(rawDate,[
      'MMM DD, YYYY hh:mm a', // US datetime pattern
      'MMM DD, YYYY HH:mm',
      'MMM DD, YYYY',
      
      'YYYY-MM-DD HH:mm:ss', // custom datetime pattern
      'YYYY-MM-DD HH:mm',
      'YYYY-MM-DD',
      
      'ddd MMM DD YYYY HH:mm:ss', // javascript date object datetime pattern
      'ddd MMM DD YYYY HH:mm',
      'ddd MMM DD YYYY'
    ]);
  } else {
    momentDate = moment.invalid();
  }
  return momentDate;
}

notes.md

• pattern that causes timezone wrong value

  • FEB 07, 2016

  • FEB 07, 2016 10:00 AM

var US_DATETIME_PATTERN_REGEXP = /^(\w{3}\s\d{1,2},\s\d{4})(\s(\d{1,2}:{0,1}){2}\s(am|pm)){0,1}?$/i;
var US_DATETIME_PATTERN_MOMENT = 'MMM DD, YYYY hh:mm a';

• pattern that works with timezones

  • 2016-02-07

  • 2016-02-07 10:00:00

var CUSTOM_DATETIME_PATTERN_REGEXP = /^(\d{4}-\d{1,2}-\d{1,2})(\s(\d{1,2}:{0,1}){2,3}){0,1}?$/i;
var CUSTOM_DATETIME_PATTERN_MOMENT = 'YYYY-MM-DD HH:mm:ss';

• javascript date object string pattern

  • Sun Feb 07 2016

  • Sun Feb 07 2016 07:00:00

var JS_DATETIME_PATTERN_REGEXP = /^(\w{3}\s\w{3}\s\d{1,2}\s\d{4})(\s(\d{1,2}:{0,1}){3}(\s\w{3}-\d{4}){0,1}){0,1}?$/i;
var JS_DATETIME_PATTERN_MOMENT = 'ddd MMM DD YYYY HH:mm:ss';