Parse timestamp strings with timezones. Use Denver timezone if timezone is 00 (ie not set).

parse-timezone-default.js

// Denver ISO 8601 Offset
// see https://github.com/moment/moment/issues/1422#issuecomment-32908589

var DEFAULT_TIMEZONE_OFFSET = '-07:00'
var moment = require('moment')

console.log(parseTime('2013-01-01T00:00:00-02:00'))
console.log(parseTime('2013-01-01 00:00:00'));

function parseTime(input) {
  var date = moment.parseZone(input)
  var zone = date.zone()
  if (zone === 0) {
    return date.zone(DEFAULT_TIMEZONE_OFFSET).toISOString()
  }
  return date.toISOString()
}