I am experiencing an issue with my date filter where it does not display any results when I choose the same date for the start and end dates. Can anyone help me troub

Having an issue with my custom filter pipe in Angular. When I select the same dates in the start and end date, it doesn't display the result even though the record exists for that date.

I've noticed that I have to enter a date 1 day before or earlier in the start date in order to see the result. Any suggestions on what changes I should make in my filter?

import { Pipe, PipeTransform } from "@angular/core";

@Pipe({
  name: "tableFilter"
})

export class TableFilterPipe implements PipeTransform {
  transform(list: any[], filters: any) {
    const keys = Object.keys(filters).filter(key => filters[key]);
    const filterUser = (user: { [x: string]: any; }) =>
      keys.every(key => {
        if (key == "sdob") {
          return new Date(user["dob"]) >= new Date(filters[key]);
        } else if (key == "edob") {
          return new Date(filters[key]) >= new Date(user["dob"]);
        } else {
          return user[key] === filters[key];
        }
      });
    return keys.length ? list.filter(filterUser) : list;
  }
}

Answer №1

Modify the TableFilterPipe as shown below and verify

if (key == "start_date") {
     return new Date(user["date_of_birth"]) >= new Date(new Date(filters[key]).setHours(0,0,0,0));
} else if (key == "end_date") {
     return new Date(new Date(filters[key]).setHours(0,0,0,0)) >= new Date(user["date_of_birth"]);
}

Answer №2

When working with Date() calculations or manipulations, utilizing milliseconds can be a very effective approach. Consider updating your date filter to calculate datetime instead of just date.

Some people often struggle with understanding date ranges. For example, while some countries interpret 00:00:00 to 24:00:00 as the same, in terms of usability it can make a significant difference.

Imagine hosting a contest on your website where contestants must submit their entries by a specific global time. In such cases, both date and time matter, which is where UTC in milliseconds becomes valuable.

  1. Store dates in datetime format, like "2020-12-30 09:37:00" (e.g., MySQL datetime always in milliseconds UTC).
  2. Retrieving a datetime from the database will give you its millisecond equivalent, for instance, "2020-12-30 09:40:00" = 1609314000000 milliseconds since epoch.
  3. When comparing datetimes, even within the same date range, using milliseconds ensures accurate integer-based comparisons.

You can adjust the above steps to accommodate your country's datetime offset if needed.

DATA STRUCTURE AND LOGIC EXAMPLE:

//dataset or Jason retrieved from your database
let dataset =[{user:'a',datetime:1609314000000},{user:'b',datetime:1609314000000}]

// When comparing inside your filter
// Find the record and extract its datetime
    let foundUser = dataset.filter(obj => obj.user === 'b');
    console.log(foundValue[0].datetime) // result: 1609314000000

// Apply any logic operator, such as >=, <=, == etc...

Comparing two long integers is more space efficient than assigning values to a new Date() object.

  • 1 variable of long integer = 4 bytes
  • 1 Date() object according java.util.Date = 32 bytes (Object memory calculations)

I hope this offers a different perspective for your situation!

Answer №3

The issue in the filter pipe appears to be stemming from the way date objects are being compared. Instead of using a comparison method that may not work as expected:

new Date(user["dob"]) >= new Date(filters[key])

You can utilize the 'getTime()' method on the date objects for comparison, or explore alternative methods mentioned in this discussion: comparing two dates

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