Add optional seconds picker

src/models/time.ts

@@ -1,9 +1,15 @@
+import { Direction } from '../types';
 import { Hour } from './hour';
 import { Minute } from './minute';
-import { Direction } from '../types';
+import { Second } from './second';
 
 export class Time {
-  constructor(public hour: Hour, public minute: Minute, private _linkValues: boolean = false) {}
+  constructor(
+    public hour: Hour,
+    public minute: Minute,
+    public second: Second,
+    private _linkValues: boolean = false
+  ) {}
 
   hourStep(direction: Direction): void {
     this.hour.stepUpdate(direction);
@@ -17,7 +23,15 @@ export class Time {
     this.minute.stepUpdate(direction);
   }
 
+  secondStep(direction: Direction): void {
+    if (this._linkValues && this.second.willOverflow(direction)) {
+      this.minute.stepUpdate(direction, 1);
+    }
+
+    this.second.stepUpdate(direction);
+  }
+
   get value(): string {
-    return `${this.hour.value}:${this.minute.value}`;
+    return `${this.hour.value}:${this.minute.value}:${this.second.value}`;
   }
 }