Let's Go To Coding Mountain - 查理 Charles

  https://stackoverflow.com/questions/35159079/is-it-possible-to-use-a-pipe-in-the-code First declare the pipe in the  providers  of your module: import { YourPipeComponentName } from 'your_component_path'; @NgModule({ providers: [ YourPipeComponentName ] }) export class YourServiceModule { } Then you can use  @Pipe  in a component like this: import { YourPipeComponentName } from 'your_component_path'; class YourService { constructor(private pipe: YourPipeComponentName) {} YourFunction(value) { this.pipe.transform(value, 'pipeFilter'); } }

https://stackoverflow.com/questions/40377103/how-to-convert-date-into-this-yyyy-mm-dd-format-in-angular-2 component.ts   constructor (       public datepipe : DatePipe ,   ) {} function(){   // 日期轉換     const ConvertedDate = this . datepipe . transform (       this . myForm . controls . myDate . value ,       ' yyyyMMdd ' ,     ) ; } 其中 'yyyyMMdd' 可以自訂為其他格式 像是 'yyyy/MM/dd' 之類的 就會輸出 2022/08/23 app.module.ts import { DatePipe } from ' @angular/common ' ;   providers : [      DatePipe ,   ] ,