import React from 'react';
import { Text, Button } from 'react-native';
import RNDateTimePicker from '@react-native-community/datetimepicker';

const Timer = ({}) => {
    const [picker, setPicker] = React.useState({time: null, date: null});
    const [mode, setMode] = React.useState(null);

    const setTimer = (event, time) => {
         if (mode == 'date') {
             if (time) setPicker(e => ({...e, date: time}));
             setMode('time');
         } else if (time && picker.date ) {
             setPicker(e => ({...e, time: time}));
             // do something here   
        }
    }

    const humanReadable = () => {/* return human readable date time format (2022/05:31 13:59:00) */}

    return (
        <>
             <Text>{ humanReadable() }</Text>
             <Button value="Get Date & Time" onPress={() => setMode("date")} />
             { 
                 mode && (
                     <RNDateTimePicker 
                           onChange={setTimer} 
                           mode={mode}
                           display={mode=='date' ? "calendar" : "clock"}
                           themeVariant="light" 
                           value={picker[mode] ?? new Date()} 
                     />
                 )
             }
        </>
    )
}

Beacuse i m working on android. So i have no option for set mode "datetime". That is why i have added here this. My question is how to get human readable datetime