User Session time in Phoenix

Phoenix Forum Questions / Help
,
1

I’d like to pass user local time difference from UTC to convert displayed Phoenix data for the user.
Currently we get this minute difference with javascript below.

export var time_from_utc = {
  run: function () {
    var date = new Date()
    var minutes = date.getTimezoneOffset()
    localStorage.setItem('time_from_utc', minutes)
  }
}

In Phoenix layout.html.eex

<script>
  var time_from_utc = localStorage.getItem('time_from_utc')
  if (time_from_utc) {} else { time_from_utc = 0 }
  document.cookie = 'time_from_utc = ' + time_from_utc
</script>

In Phoenix Controller

...
conn.cookies["time_from_utc"]
...

Is there any plug or better way to get/set it in user’s conn session?

Thanks.