Date Pipe not working for numeric to month string

Ionic Framework ionic-v3
1

I want to convert numeric to month string using date pipe. (e.g 1 to January)
I am using *ngFor to iterate through complete list.
But currently it is showing January month to every number.
Anyone have idea about it.

2

Can you put your code? Are you using {{data | date }} ? Formatting is quite clear on Angular docs