Angular 2 - Compare date in an array filter

Question

This will get me current time in seconds:

let currentTimeInSeconds = new Date().getTime() / 1000;

I have an array with the object expirationDate, it returns that information in seconds. I can get the bills that expired, however, I'd like to filter out the bills that are expiring today.

this.ExpiringTodayBills = this.UnpaidDuebills.filter(bills => bills.paid === false && bills.expirationDate = currentTimeInSeconds);

The above code doesn't work because current time changes constantly due to hours, minute, seconds and milliseconds.

How would I be able to compare if expirationDate = today, regardless of the time?

Edit: This is an example of a bill

name: Test bill

paid: false

expirationDate: 1535598000 (which means August 30, 2018 3:00:00 AM)

amount: 231.33

Have you tried this: https://stackoverflow.com/questions/8305259/check-if-date-is-in-the-past-javascript — SiddAjmera, Sep 03 '18 at 19:55
@SiddharthAjmera and how would I be able to do that inside a filter? Granted that I can do that with `currentTimeInSeconds`, but what about `bills.expirationDate` that is coming out from inside the filter? — Rosenberg, Sep 03 '18 at 19:56

SiddAjmera · Accepted Answer · 2018-09-03T20:27:52.960

3

How about this?

isExpiringToday(expirationDate) {
  const start = new Date();
  start.setHours(0, 0, 0, 0);

  const end = new Date();
  end.setHours(23, 59, 59, 999);

  const expiryDateTimeStamp = expirationDate * 1000;

  return (expiryDateTimeStamp > start && expiryDateTimeStamp < end);
}

this.ExpiringTodayBills = this.UnpaidDuebills
  .filter(bills => !bills.paid && this.isExpiringToday(bills.expirationDate));

You can test this by opening the Browser Dev Tools, going to the console and doing this:

function isToday(expiryDateTimeStamp) {
    const start = new Date();
    start.setHours(0, 0, 0, 0);

    const end = new Date();
    end.setHours(23, 59, 59, 999);

    return (expiryDateTimeStamp > start && expiryDateTimeStamp < end);
}

var newDate = new Date();
isToday(newDate.getTime())  // true

edited Sep 03 '18 at 20:27

answered Sep 03 '18 at 20:06

SiddAjmera

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How would it know if the bill expires today? It gets all the expired bills, but I wanna cherry pick the ones that expire today. – Rosenberg Sep 03 '18 at 20:14
Updated the answer. – SiddAjmera Sep 03 '18 at 20:18
I feel like this is very close to the answer, but unfortunately it returns false to every date, including the ones expiring today. – Rosenberg Sep 03 '18 at 20:26
Works for me. I swear :P – SiddAjmera Sep 03 '18 at 20:32

score 0 · Answer 2 · answered Sep 03 '18 at 20:01

You should loop through your data and convert your expirationDate from currentTimeInSeconds to a date. The library moment.js can be helpful. Next, you can do:

this.ExpiringTodayBills = this.UnpaidDuebills.filter(bills => bills.paid === false && bills.expirationDate = today);

const today = moment().format('MM/DD/YYYY');
console.log(today);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.8.4/moment.min.js"></script>

Angular 2 - Compare date in an array filter

2 Answers2