Displaying and verifying the current date with JHipster

Question

Displaying and verifying the current date with JHipster

It may sound strange, but I'm having trouble figuring out how to compare a date field in an HTML created by JHipster test if it's greater than the current date.

I attempted to display the date fetched from the database as 2020-12-12 and then tried to show the current date. After searching online, I found that it's possible to obtain the current date using: new Date(). However, when I try to display this on the page, I encounter an error:

ERROR Error: Uncaught (in promise): Error: Template parse errors:
Parser Error: Unexpected token 'Date' at column 5 in [ {{new Date()}} ] in...

How do I retrieve the current date for comparison with the one retrieved from the database?

Below is the code from myclass.component.html where I need to validate the date:

<div>
    <jhi-alert-error></jhi-alert-error>
...
    <div class="table-responsive" *ngIf="myclasses?.length > 0">
        <table class="table table-striped" aria-describedby="page-heading">
            <thead>
            <tr jhiSort [(predicate)]="predicate" [(ascending)]="reverse" [callback]="transition.bind(this)">
            <th...
            </tr>
            </thead>
            <tbody>
            <tr *ngFor="let myclasse of myclasses ;trackBy: trackId">
                <td>{{myclass?.id}}</td>
                ...
                <td>
                  {{ new Date() }}
                </td>
 ...

angular typescript jhipster

Answer 1

Answer №1

Typically, dealing with dates is more convenient when using the MomentJS library since it comes integrated into JHipster already.

If you want to determine if a date is in the future, you can create a function in your [entity].component.ts file that returns a boolean value as shown below:

import * as moment from 'moment';
import { Moment } from 'moment';
...
  isFutureDate(date: Moment): boolean {
    return moment().isBefore(date);
  }

You can then call this function in your [entity].component.html like this:

<td>
  Date is in the future: {{ isFutureDate(myclass.date) }}
</td>

In case you just need to calculate the difference between a specific date and the current time, you can easily do so. In your ...component.ts:

import * as moment from 'moment';
import { Moment } from 'moment';
...
  getDateDiff(date: Moment): number {
    const diff      = date.diff(moment());
    const duration  = moment.duration(diff);
    return duration.asHours();
  }

And in your ...component.html:

<td>
  Difference in hours: {{ getDateDiff(myclass.date) | number: '2.0-0' }} hours
</td>

The getDateDiff() function will provide the difference in hours between the specified date parameter (myclass.date) and the current date (moment()). The result will be negative if the date is in the past.

MomentJS offers robust functionalities, and you can explore its detailed documentation here. Additionally, you can refer to the following links for more information on the methods used:

isBefore(): Determines if one date is before another
diff(): Calculates the difference between two dates in milliseconds
duration(): Facilitates working with time durations efficiently
asHours(): Retrieves the total number of hours in a duration

Answer 2

Typically, dealing with dates is more convenient when using the MomentJS library since it comes integrated into JHipster already.

If you want to determine if a date is in the future, you can create a function in your [entity].component.ts file that returns a boolean value as shown below:

import * as moment from 'moment';
import { Moment } from 'moment';
...
  isFutureDate(date: Moment): boolean {
    return moment().isBefore(date);
  }

You can then call this function in your [entity].component.html like this:

<td>
  Date is in the future: {{ isFutureDate(myclass.date) }}
</td>

In case you just need to calculate the difference between a specific date and the current time, you can easily do so. In your ...component.ts:

import * as moment from 'moment';
import { Moment } from 'moment';
...
  getDateDiff(date: Moment): number {
    const diff      = date.diff(moment());
    const duration  = moment.duration(diff);
    return duration.asHours();
  }

And in your ...component.html:

<td>
  Difference in hours: {{ getDateDiff(myclass.date) | number: '2.0-0' }} hours
</td>

The getDateDiff() function will provide the difference in hours between the specified date parameter (myclass.date) and the current date (moment()). The result will be negative if the date is in the past.

MomentJS offers robust functionalities, and you can explore its detailed documentation here. Additionally, you can refer to the following links for more information on the methods used:

isBefore(): Determines if one date is before another
diff(): Calculates the difference between two dates in milliseconds
duration(): Facilitates working with time durations efficiently
asHours(): Retrieves the total number of hours in a duration

Displaying and verifying the current date with JHipster

Answer №1

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