How to calculate difference between 2 times in React Native?

user_12067708 0
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I am trying to calculate difference between 2 times. But it is not working as I expected.

e.g: In the following photo

  1. current Time
  2. item created Time
  3. current Time converted to millisecond
  4. created Time converted to millisecond
  5. current - created (millisecond)

enter image description here

As shown image, I expected the difference 17h 19min 27s. But it gave me 5h 19min 27s. (Just 12 hours difference)

I am not sure that is AM(PM) problem or Time zone problem. I used following method.

<Text red>{dayjs(new Date().getTime()).format('YYYY-MM-DD HH:mm:ss')}</Text>
<Text red>{dayjs(new Date(`${item.created_at.slice(0, 10)}T${item.created_at.slice(11, 19)}`).getTime()).format('YYYY-MM-DD hh:mm:ss')}</Text>
<Text red>{new Date().getTime()}</Text>
<Text red>{new Date(`${item.created_at.slice(0, 10)}T${item.created_at.slice(11, 19)}`).getTime()}</Text>
<Text red>{new Date().getTime()-new Date(`${item.created_at.slice(0, 10)}T${item.created_at.slice(11, 19)}`).getTime()}</Text>

How can I get exact difference? In a word, new Date().getTime() is not working as I expected.

react-native javascript
2 Answers

I ll suggest u to use date-fns library

var differenceInMilliseconds = require('date-fns/differenceInMilliseconds')
differenceInMilliseconds(dateLeft, dateRight)
user_75399270

This way I am getting the correct value.

const printRemainingTime = (t2) => {
  const t1 = new Date().getTime();
  let ts = (t1-t2.getTime()) / 1000;

  var d = Math.floor(ts / (3600*24));
  var h = Math.floor(ts % (3600*24) / 3600);
  var m = Math.floor(ts % 3600 / 60);
  var s = Math.floor(ts % 60);

  console.log(d, h, m, s)

}

printRemainingTime(new Date("2020-11-26T06:29:33"));

See: https://stackblitz.com/edit/js-xqdk64

user_143498080
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