Angular - Displaying a notification when the timezone does not align with the current moment in time

I am currently working on an angular project where users are only allowed to create tasks for today or future dates using a date picker.

I have implemented the <mat-datepicker> along with moment to disable past dates.

<mat-form-field formGroupName="user">
        <mat-label>Due Date</mat-label>
        <input
          matInput
          [min]="dueDateMin"
          [matDatepicker]="picker"
          (click)="picker.open()"
          placeholder="Choose a date"
          formControlName="date"
          (dateChange)="setTaskDueDate($event.value); checkAvailableEfforts()"
          required
        />
        <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
        <mat-hint>Task completion date.</mat-hint>
        <mat-error>Due date is required</mat-error>
        <mat-datepicker #picker></mat-datepicker>
</mat-form-field>

In Component

dueDateMin = moment();

Issue: Users can bypass the date restrictions by changing the timezone of their browser.

Query: Is there a way to display an alert to users if they open the app in a different timezone than the specified one (e.g. "Asia/Calcutta" - India Timezone)?

or Force the application to use a consistent timezone regardless of the user's system timezone.

Thank you in advance!

javascriptangulartypescriptmomentjsangular-moment

Answer №1

If you want to ensure a consistent time, consider adjusting your default time to the desired zone. 

moment.tz.setDefault(your_chosen_timezone);

As an illustration: 

moment.tz.setDefault("America/Los_Angeles");

Answer №2

Avoid relying on the user's device clock for setting timestamps in your front-end code as it may not be accurate. Instead, utilize the server timestamp provided by Firestore to ensure all users are using the same time reference. Use serverTimeStamp to maintain consistency in time tracking. See the example code snippet below:

const { serverTimestamp, increment } = firebase.firestore.FieldValue;
    ref.update({
   timestamp: serverTimestamp()
})

Hopefully, this information proves helpful!

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