get offsetNameLong() {
    if (this.isValid) {
      return this.zone.offsetName(this.ts, {
        format: "long",
        locale: this.locale,
      });
    } else {
      return null;
    }
  }
Get the long human name for the zone's current offset, for example "Eastern Standard Time" or "Eastern Daylight Time".
Defaults to the system's locale if no locale has been specified
@type {string}