Manipulating datetime format within an input element of type date using Angular's ngModel

I have a date input in my form that is populated from the controller with a string value for 'dateOfDiagnosis'. The format of this string includes the time as well, like this:

"2010-09-08T00:00:00"

To bind this value to an input field in Angular, I use the following syntax:

<input type="date" class="form-control" [(ngModel)]="claim.claimData.dateOfDiagnosis" (ngModelChange)="markDirty()" name="dateOfDiagnosis">

However, when trying to display this value, I encountered an error/warning message in the console:

The specified value "2010-09-08T00:00:00" does not match the required format, "yyyy-MM-dd".

I attempted to solve this issue by using the slice method in the template like this:

[(ngModel)]="claim.claimData.dateOfDiagnosis.slice(0,10)"

Unfortunately, this approach resulted in multiple errors.

Is there a way to format the date value directly within the HTML without any modifications to the TypeScript file? Or what else can be done to resolve this issue without changing anything in the .ts file?

The specific error message displayed is:

Error: Template parse errors: Parser Error: Unexpected token '=' at column 44 in [claim.claimData.dateOfDiagnosis.slice(0,10)=$event] in ng:///AppModule/WmacComponent.html@60:92 ("/label> ]claim.claimData.dateOfDiagnosis.slice(0,10)" (ngModelChange)="markDirty()" name="dateOfDiagnosis">

javascriptangulartypescriptdate-formatting

Answer №1

The issue at hand is due to the nature of two-way binding with ngModel. When you attempt to use a method like slice for passing a value down, it may not work as expected when trying to pass the modified value back up. The ngModel binding in question appears as follows:

[ngModel]="claim.claimData.dateOfDiagnosis.slice(0,10)" 
    (ngModelChange)="claim.claimData.dateOfDiagnosis.slice(0,10)=$event"

The line mentioned above,

claim.claimData.dateOfDiagnosis.slice(0,10)=$event

is logically incorrect and is likely the cause of the error being triggered.

To resolve this issue, there are various approaches that can be taken based on the specific requirements of the scenario.

If the format of the dateOfDiagnosis field does not need to strictly adhere to 2010-09-08T00:00:00, a simple solution would involve assigning:

this.claim.claimData.dateOfDiagnosis = this.claim.claimData.dateOfDiagnosis.slice(0,10);

at the point of assignment. Alternatively, creating a separate variable to manage the date in YYYY-MM-DD format and appending T00:00:00 before assigning it back to claim.claimData.dateOfDiagnosis could also be considered.

An extended form of utilizing ngModel could handle all modifications within the binding itself. For instance:

[ngModel]="claim.claimData.dateOfDiagnosis.slice(0,10)" 
    (ngModelChange)="claim.claimData.dateOfDiagnosis = $event + 'T00:00:00'"

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