CODEWITHSUNDEEP
javascriptreactjsdatedatetime
HDaniel999
HDaniel999

Reputation: 27

How to get days until X date and stop counting when X date reaches 0

this code already gets the days until x date but it keeps counting when x date reaches the same date, how can I zero it out to stop counting?

const counters = this.state.counters.map((counters, i) => {
  let untildate = counters.date
  let diffDays1=(function(){ 
    let oneDay = 24*60*60*1000 // hours*minutes*seconds*milliseconds
    let secondDate = new Date(untildate);
    let firstDate = new Date();
    return (`${Math.round(Math.abs((firstDate.getTime() - secondDate.getTime())/(oneDay)))} Days`)
  })();

If the input date is 2019-04-05T20:00:00.782Z the out put should be 0

Upvotes: 2

Views: 86

Answers (2)

RobG
RobG

Reputation: 147453

There are many answers for how to get the difference between two dates in days, like this.

Your code seems overly convoluted. Assuming the input dates are in a format like 2019-05-10 and you're using the built-in parser, you can work in UTC and avoid any daylight saving issues.

Just test the difference in days, if it's 0 or less, return zero. Otherwise, return the difference. E.g.

var dates = ['2019-01-01','2019-05-10','2019-05-20'];

var counters = dates.map(date => {
  let diffDays = (new Date(date) - new Date().setUTCHours(0,0,0,0))/8.64e7;
  return diffDays > 0? diffDays : 0;
});

console.log(counters)

Upvotes: 0

stevendesu
stevendesu

Reputation: 16831

Use Math.max to return the larger of two values. In your case, you want to return the number of days remaining only if that number is greater than 0, otherwise you want to return 0:

const counters = this.state.counters.map((counters, i) => {
  let untildate = counters.date
  let diffDays1=(function(){ 
    let oneDay = 24*60*60*1000 // hours*minutes*seconds*milliseconds
    let secondDate = new Date(untildate);
    let firstDate = new Date();
    return (`${Math.max(0, Math.round(Math.abs((firstDate.getTime() - secondDate.getTime())/(oneDay))))} Days`)
  })();

Upvotes: 1

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