get monthShort() {
    return this.isValid ? Info.months("short", { locObj: this.loc })[this.month - 1] : null;
  }
Get the human readable short month name, such as 'Oct'.
Defaults to the system's locale if no locale has been specified
@example DateTime.local(2017, 10, 30).monthShort //=> Oct
@type {string}