Comparing dates in Angular and Ionic: A breakdown

I am facing an issue with comparing dates in my ion-datetime input and a date variable obtained from the server. The problem arises because when I retrieve the value from the input, it includes the time field along with the date. As a result, using the getTime() method for comparison does not produce accurate results. Do you have any suggestions on how to transform the date or reset the time before making the comparison?

Here is the code snippet of my current method:

ngOnInit() {
    this.desde = new Date(this.navParams.get('desde'));
    this.hasta = new Date(this.navParams.get('hasta'));
    this.auth.userData$.subscribe((res: any) => {
        this.authUser = res;
        this.postData = {token: this.authUser.token};
        if (this.postData) {
            this.planificadorService.planificadorData(this.postData).subscribe((res2: any) => {
                this.planificadorData = res2.planificadorData;
                this.planificadorData.forEach(item => {
                    if (item.fecha !== '') {
                        const fechaPlan = new Date(item.fecha);
                        if (fechaPlan.getTime() >= this.desde.getTime() && fechaPlan.getTime() <= this.hasta.getTime()) {
                            this.visblePLanificadorData.push(item);
                        }
                    }
                });
                console.log(this.visblePLanificadorData);
            });
        }

    });
}

Input Dates:

desde: "2020-01-24T18:23:18.633-05:00"
hasta: "2020-01-27T18:23:18.634-05:00"

Expected Format:

desde: "2020-01-24T00:00:00.000-00:00"
hasta: "2020-01-27T00:00:00.000-00:00"

Answer №1

In JavaScript, you can safely use the relational operators (>, <, <=, >=) to compare two dates. To compare against a range, it is recommended to use these operators.

Confusion may arise when trying to use the equality operators (==, ===, !=, !==), as they compare "date instances" rather than "date values".

To "reset time", you can achieve this with

d2 = new Date(d).setHours(0,0,0,0);
. Check out the Mozilla Date.prototype.setHours() documentation for more information.

There are various methods available for comparing JavaScript dates. I suggest reviewing this post, which covers many of them along with the concepts mentioned above: Compare two dates with JavaScript

Answer №2

The seemingly logical approach is to execute the following:

new Date(this.desde.toDateString()).getTime()

Is there a more effective method for accomplishing this task?

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