Set timezone React-Datepicker

Question

I'm using the react-datepicker to let user select a date. However, right now it uses local time (PDT), but I want to hardcode it to use a specific timezone (PST).

I tried using utcOffset prop but it doesn't seem to be doing anything. Does anyone know how to accomplish this?

Answer 1

For my part I set the defaultTimezone before rendering the React-dates plugin. React-dates will just use the default timezone.

moment.tz.setDefault('America/Los_Angeles');

Answer 2

This works for me:

import React, { ComponentProps } from "react"
import DatePicker from "react-datepicker"
import moment from "moment"

interface Props {
  timezone: string
}

const DatePickerWithTimezone = ({
  selected,
  onChange,
  timezone,
  ...props
}: Props & ComponentProps<typeof DatePicker>) => (
  <DatePicker
    selected={selected ? setLocalZone(selected, timezone) : null}
    onChange={(v, e) => {
      onChange(v ? setOtherZone(v, timezone) : null, e)
    }}
    {...props}
  />
)

const setLocalZone = (date: Date, timezone: string) => {
  const dateWithoutZone = moment
    .tz(date, timezone)
    .format("YYYY-MM-DDTHH:mm:ss.SSS")
  const localZone = moment(dateWithoutZone).format("Z")
  const dateWithLocalZone = [dateWithoutZone, localZone].join("")

  return new Date(dateWithLocalZone)
}

const setOtherZone = (date: Date, timezone: string) => {
  const dateWithoutZone = moment(date).format("YYYY-MM-DDTHH:mm:ss.SSS")
  const otherZone = moment.tz(date, timezone).format("Z")
  const dateWithOtherZone = [dateWithoutZone, otherZone].join("")

  return new Date(dateWithOtherZone)
}

export default DatePickerWithTimezone

Answer 3

since datepicker doesn't use moment.js anymore i tried to implement a hacky solution for this issue, assuming the initial value is a string for instance:

export const formatUTC = (dateInt, addOffset = false) => {
    let date = (!dateInt || dateInt.length < 1) ? new Date : new Date(dateInt);
    if (typeof dateInt === "string") {
        return date;
    } else {
        const offset = addOffset ? date.getTimezoneOffset() : -(date.getTimezoneOffset());
        const offsetDate = new Date();
        offsetDate.setTime(date.getTime() + offset * 60000)
        return offsetDate;
    }
}

inside date i call the formatter like this:

selected={formatUTC(this.props.input.value,true)}
                    onChange={date => formatUTC(date)}

Answer 4

I've been thru this, If you decided that you want to just ignore your local offset then you can hardcode the zone. Observation just to give a complete answer: PST will always be -08:00, but if you want for example pacific time, right now is -07:00, in this case, you may want to install 'moment.timezone' then import moment from 'moment-timezone' and just get the current offset with moment.tz('US/Pacific').format('Z')

The code in typescript (I can change it to Javascript if you want):

interface ICalendarInputProps {
  handleChange: (newDate: moment.Moment) => void;
}

const CalendarInput = ({ handleChange }: ICalendarInputProps) => {
  const onChange = (date: Date) => {
    handleChange(moment(`${moment(date).format('YYYY-MM-DDThh:mm:ss')}-08:00`));
    // This is to get the offset from a timezone: handleChange(moment(`${moment(date).format('YYYY-MM-DDThh:mm:ss')}${moment.tz('US/Pacific').format('Z')}`));
  };

  return (<DatePicker onChange={onChange} />);
};

export default CalendarInput;