Synchronize the UTC server with all users

I am trying to make a calendar which I can not do the synchronization adjustment with the server uses UTC ++ 0000
So when making the activation of reminders will always occur a margin well above or below the GMT that the user is.

For the time I am using precolate-cronjobs I leave the code of my logic to see if they can give me a help or to point me a better solution.

I only need to apply the format of the utc + 000 to make the adjustment to any time use with the server utc + 000 and there is no such time difference in any case.

/*remminder.js*/
import moment from 'moment';
  SyncedCron.add({
    name: 'Recordatorio Personas',
    schedule: function(parser) {
      return parser.text('every 10 seconds');
    },
    job: function(intendedAt) {
      Meteor.call('timer1', intendedAt);
    }
});

  Meteor.startup(function () {
    SyncedCron.start();
    console.log("iniciando..")
  });

/*timer.js*/
import { Meteor } from 'meteor/meteor';
import moment from 'moment';
import momentT from 'moment-timezone';

Meteor.methods({
  timer1: function(timer){
    //console.log("metodos Timer",timer);
    var data = AddPerson.find({ id: this.userId}).fetch();
    for (var i = 0; i < data.length; i++) {
       /****************GLOBAL************************/
       console.log('/*Server logs CronJobs*/')
        //var timerD = moment(timer).format('HH:mm');
        var s = momentT.tz.guess();
        var TimerD = momentT.tz(timer, s).format('HH:mm');;
        var createdAt=data[i].createdAt;
        var m =moment.utc(createdAt).format('YYYY-MM-DD');
        var mh= m +' '+ data[i].hora;
        var mhutc = momentT.tz(mh, s).format('HH:mm');
        var dateTime= new Date();
          console.log('hUser:',data[i].hora);
          console.log('DateSistema:', dateTime)
          console.log('mh:', mh);
          console.log('s:',s);
          console.log('mhutc',mhutc);
          console.log('m',m);
          console.log('timerCron:', timer);
          console.log('convertTimer:',TimerD);
          console.log('/****end logs*****/');
           /****************GLOBAL***********************/
          /****************Daily************************/
      if (data[i].recordatorio === 'Diario' || data[i].recordatorio === 'Daily'){
        if (TimerD === data[i].hora) {
           console.log("STOP Send Push")
           Meteor.call("serverNotification");
        } else {
          console.log('contando.');
        }
      }
        /*****************Weekly************************/
      if (data[i].recordatorio === 'Semanal' || data[i].recordatorio === 'Weekly' ){
          var timerSemanal=  moment(data[i].createdAt).day();
          var timerS = moment(timer).day();
          if (TimerD === mhutc && timerSemanal === timerS) {
            console.log("STOP Enviar Push")
             Meteor.call("serverNotification");
          } else {
            console.log('contando.');
          }
      }
    /*****************Monthly************************/
      if (data[i].recordatorio === 'Mensual' || data[i].recordatorio === 'Monthly'){
        var TimerMes= moment(timer).date();
        var timerM = moment(timer).date();
        if (TimerD === data[i].hora && timerMes === timerM) {
            console.log("STOP Enviar Push")
            Meteor.call("serverNotification");
        } else {
          console.log('contando.');
        }
      }
      /*****************end************************/
    }
  }
})