shiftDayTimeToTimezone.ts

import moment from 'moment-timezone'

export const shiftUtcDayTimeToTimezone = (
  utcDayTime: string,
  timezone: string
) => {
  const offsetMinutes = moment.tz(moment.utc(), timezone).utcOffset()
  const [hours, minutes] = utcDayTime.split(':')
  const quotient = Math.floor(offsetMinutes / 60)
  const remainder = offsetMinutes % 60

  return `${Number(hours) + quotient}:${Number(minutes) + remainder}`
}