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There are a few ways to alter the background image in React Native according to the time zone:

1. Using the Date and Time API: You can use the Date and Time API in JavaScript to get the current time zone and then set the background image based on that. For example:

const currentTime = new Date();
const currentHour = currentTime.getHours();
const currentZone = currentTime.getTimezoneOffset();

if (currentZone === 240) { // Eastern Time Zone
  background = require('./eastern-timezone.jpg');
} else if (currentZone === 300) { // Central Time Zone
  background = require('./central-timezone.jpg');
} else {
  background = require('./default-background.jpg');
}

1. Using a third-party library: There are several third-party libraries available in React Native that can help you determine the time zone and set the background image accordingly. Some popular libraries include moment-timezone and react-native-localize.

import moment from 'moment-timezone';

const currentZone = moment.tz.guess();

if (currentZone === 'America/New_York') { // Eastern Time Zone
  background = require('./eastern-timezone.jpg');
} else if (currentZone === 'America/Chicago') { // Central Time Zone
  background = require('./central-timezone.jpg');
} else {
  background = require('./default-background.jpg');
}

1. Using the user's location: You can also use the user's location to determine their time zone and set the background image based on that. You can either ask the user to allow location access or use a library like react-native-geolocation-service or react-native-location to get the user's location.

import Geolocation from 'react-native-geolocation-service';

Geolocation.getCurrentPosition((position) => {
  const lat = position.coords.latitude;
  const long = position.coords.longitude;
  const currentZone = Geolocation.getTimeZone(lat, long);

  if (currentZone === 'America/New_York') { // Eastern Time Zone
    background = require('./eastern-timezone.jpg');
  } else if (currentZone === 'America/Chicago') { // Central Time Zone
    background = require('./central-timezone.jpg');
  } else {
    background = require('./default-background.jpg');
  }
}, (error) => {
  console.log(error);
});