How can I verify that the value entered in an input field matches a specific date format such as "MM/dd/YYYY" using Angular?

Question

How can I verify that the value entered in an input field matches a specific date format such as "MM/dd/YYYY" using Angular?

I need to validate if a given value matches a specific date format such as "MM/dd/YYYY."

Typescript file

onValChange(event: Date) {
    const datePipe = new DatePipe('en-US');
    const val = datePipe.transform(event, 'MM/dd/yyyy');
    this.writeValue(moment(event));
  }

HTML file

<input class="form-control form-control-sm requiredV" [(ngModel)]="dateValue"
     placeholder="mm/dd/yyyy" name="dateField" id="dateField" ngbDatepicker
     #dateFieldngb="ngbDatepicker" [required]="isRequired"
     [ngClass]="{'isUntouched':formName.submitted}" (ngModelChange)="onValChange($event)"
     (keypress)="allow_only_numbers($event)" (click)="dateFieldngb.toggle()" />

Could you please advise me on how to verify if the entered value conforms to this specific format?

angular typescript

Answer 1

Answer №1

When it comes to managing dates, I typically rely on an external library.

https://momentjs.com

One handy function offered by this library is valid(), which can be implemented as shown below:

moment(date, 'MM/DD/YYYY').isValid()

Answer 2

When it comes to managing dates, I typically rely on an external library.

https://momentjs.com

One handy function offered by this library is valid(), which can be implemented as shown below:

moment(date, 'MM/DD/YYYY').isValid()

Answer 3

Answer №2

To easily filter your data based on dates, consider using the date pipe feature in Angular. For more details, refer to the following link:

Angular Date Pipe

Answer 4

To easily filter your data based on dates, consider using the date pipe feature in Angular. For more details, refer to the following link:

Angular Date Pipe

Answer 5

Answer №3

If you want to validate dates in JavaScript, there are two main approaches: using a library or creating a custom function.

Using a Library - moment-js

For example:

moment("2010 13",           "YYYY MM").isValid();     // false (not a real month)
moment("2010 11 31",        "YYYY MM DD").isValid();  // false (not a real day)
moment("2010 2 29",         "YYYY MM DD").isValid();  // false (not a leap year)
moment("2010 notamonth 29", "YYYY MMM DD").isValid(); // false (not a real month name)

Source: Stack Overflow thread.

Creating a Custom Function Using Regular Expression

var date_regex = /^(0[1-9]|1[0-2])\/(0[1-9]|1\d|2\d|3[01])\/(19|20)\d{2}$/ ;

if(!(date_regex.test(testDate))){
  return false;
}

Source: Stack Overflow thread

Answer 6

If you want to validate dates in JavaScript, there are two main approaches: using a library or creating a custom function.

Using a Library - moment-js

For example:

moment("2010 13",           "YYYY MM").isValid();     // false (not a real month)
moment("2010 11 31",        "YYYY MM DD").isValid();  // false (not a real day)
moment("2010 2 29",         "YYYY MM DD").isValid();  // false (not a leap year)
moment("2010 notamonth 29", "YYYY MMM DD").isValid(); // false (not a real month name)

Source: Stack Overflow thread.

Creating a Custom Function Using Regular Expression

var date_regex = /^(0[1-9]|1[0-2])\/(0[1-9]|1\d|2\d|3[01])\/(19|20)\d{2}$/ ;

if(!(date_regex.test(testDate))){
  return false;
}

Source: Stack Overflow thread

How can I verify that the value entered in an input field matches a specific date format such as "MM/dd/YYYY" using Angular?

Answer №1

Answer №2

Answer №3

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