Two-way binding between form field and moment.js date object for angular.js. With validation. Date object is in UTC, form field displays local date.

angular_momentjs_binding_directive.js

  directive('datetime', function() {
    var format = "YYYY-MM-DD HH:mm:ss"
    //date.isValid() is not enough for strict validation, see moment.js doc
    var pattern = /^\s*\d{4}-\d{2}-\d{2}\s+\d{2}:\d{2}(:\d{2})?\s*$/
    return {
      restrict: 'A',
      require: 'ngModel',
      link: function(scope, element, attr, ngModel) {
        ngModel.$parsers.push(function(text) {
          var date = moment(text, format)
          ngModel.$setValidity('dateInvalid', date.isValid() && text.match(pattern))
          return date
        })
        ngModel.$formatters.push(function(datetime_moment) {
          return datetime_moment && datetime_moment.local().format(format)
        })
      }
    };
  })