_checkTimestamp(receivedMsg) {
    if (Object.prototype.hasOwnProperty.call(receivedMsg, "serverTimestamp")) {
      const serverTimestamp = new Date(receivedMsg.serverTimestamp);
      const offset = Math.round((/* @__PURE__ */ new Date() - serverTimestamp) / 36e5);
      if (offset !== this.serverTimeOffset) {
        log("trace", "Uib:checkTimestamp:".concat(this._ioChannels.server, " (server)"), "Offset changed to: ".concat(offset, " from: ").concat(this.serverTimeOffset))();
        this.set("serverTimeOffset", offset);
      }
    }
  }
Check supplied msg from server for a timestamp - if received, work out & store difference to browser time
@param {object} receivedMsg A message object recieved from Node-RED
@returns {void} Updates self.serverTimeOffset if different to previous value
@private