1.npm install
//in package.json
"dependencies": {
    "react_native_countdowntimer":"1.0.2"
  }
//in your js code
import CountDownTimer from 'react_native_countdowntimer' 

2.local way
import CountDownReact from './CountDownReact' //


 <CountDownTimer
          //date={new Date(parseInt(endTime))}
          date="2017-11-28T00:00:00+00:00"
          days={{plural: 'Days ',singular: 'day '}}
          hours=':'
          mins=':'
          segs=''

          daysStyle={styles.time}
          hoursStyle={styles.time}
          minsStyle={styles.time}
          secsStyle={styles.time}
          firstColonStyle={styles.colon}
          secondColonStyle={styles.colon}
      />