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javascriptdayjs

dayjs is not converting timezones properly

I'm trying to convert a date from my local time (Taipei UTC+8) to Los Angeles ( UTC-7) however dayjs conversion seems to be completely off :

dayjs("2020-09-21 20:30").tz("Asia/Taipei")

this results in Tue Sep 22 2020 05:30:00 GMT-0400 (Eastern Daylight Time) but it should have been Mon Sep 21 2020 02:30:00 GMT-0400 (Eastern Daylight Time)

any idea what's going on?

Solution

  • I fixed using utc first and then format on local timezone

    import dayjs from 'dayjs'
import utc from 'dayjs/plugin/utc'
import tz from 'dayjs/plugin/timezone'

dayjs.extend(utc)
dayjs.extend(tz)

const timeZone = dayjs.tz.guess()
dayjs.utc(dateToConvert).tz(timeZone)