refactor(components): add icon module and missing imports

src/components/datetime/datetime.module.ts

@@ -1,10 +1,13 @@
 import { CommonModule } from '@angular/common';
 import { NgModule, ModuleWithProviders } from '@angular/core';
 
+import { ButtonModule } from '../button/button.module';
+
 import { DateTime } from './datetime';
 
 @NgModule({
   imports: [
+    ButtonModule,
     CommonModule
   ],
   declarations: [