@droneblocks/node-red-dexi/src/Time.js

You want to make sure you don't lose any of your flow development. Make sure to map the host "flows" directory to the container directory as shown below. This will store the flow on your host machine if/when the container is destroyed.

const timeUtils = require('./time_utils.js');

let simTimeSub = null;
let simTime = timeUtils.dateToRosTime(0);

function handleSimTimeMessage(msg) {
  simTime = msg.clock;
}

const Time = {
  useSimTime: false,

  _initializeRosTime(rosnodejs, notime) {
    //Only for testing purposes!
    if (notime) {
      return Promise.resolve();
    }
    const nh = rosnodejs.nh;
    return nh.getParam('/use_sim_time')
    .then((val) => {
      this.useSimTime = val;

      if (val) {
        simTimeSub = nh.subscribe('/clock', 'rosgraph_msgs/Clock', handleSimTimeMessage, {throttleMs: -1});
      }
    })
    .catch((err) => {
      if (err.statusCode === undefined) {
        throw err;
      }
    });
  },

  now() {
    if (this.useSimTime) {
      return simTime;
    }
    // else
    return timeUtils.now();
  },

  rosTimeToDate: timeUtils.rosTimeToDate,
  dateToRosTime: timeUtils.dateToRosTime,
  epoch:         timeUtils.epoch,
  isZeroTime:    timeUtils.isZeroTime,
  toNumber:      timeUtils.toNumber,
  toSeconds:     timeUtils.toSeconds,
  timeComp:      timeUtils.timeComp,
  add:           timeUtils.add,
  lt:            timeUtils.lt,
};

module.exports = Time;