migrate to typescript

src/core/datetime.ts

@@ -0,0 +1,20 @@
+export class MeridiemIndicator {
+    private static readonly allInstances: MeridiemIndicator[] = [];
+
+    public static readonly AM = new MeridiemIndicator(0, 'AM');
+    public static readonly PM = new MeridiemIndicator(1, 'PM');
+
+    public readonly type: number;
+    public readonly value: string;
+
+    private constructor(type: number, value: string) {
+        this.type = type;
+        this.value = value;
+
+        MeridiemIndicator.allInstances.push(this);
+    }
+
+    public static values(): MeridiemIndicator[] {
+        return MeridiemIndicator.allInstances;
+    }
+}