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javascriptmomentjsmoment-timezone

Convert time of a known timezone to local timezone in moment js

I'm trying to convert the time ( time alone ) from a known timezone to my local timezone with Moment.js.

I wrote the following function and, I am getting invalidDate as the output. 

const convertToLocalTime = (time, tz) => {

  const t = moment.tz(time, tz)
  const localTime = t.local()
}
  • time is just time; without any date eg: 10:06 am and,
  • tz is a timezone string for eg: Europe/Berlin

What am I doing wrong?

Solution

  • See Parsing in Zone:

    The moment.tz constructor takes all the same arguments as the moment constructor, but uses the last argument as a time zone identifier.

    Since your input (10:06 am) is not in ISO 8601/RFC 2822 recognized format (see moment(String) docs), you have to pass format parameter as shown in moment(String, String).

    Here a live sample:

    const convertToLocalTime = (time, tz) => {
  const t = moment.tz(time, 'hh:mm a', tz)
  const localTime = t.local()
  return localTime;
}

const res = convertToLocalTime("10:06 am", 'Europe/Berlin');
console.log( res.format('hh:mm a') );
    <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.14/moment-timezone-with-data-2012-2022.min.js"></script>