First pass at systime app

content/extras/date/_index.md

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+---
+title: Systime Date Converter
+---
+
+<div id="converter">
+<input type="text" class="systime">
+⇄
+<input type="datetime-local" class="date">
+</div>
+<script src="convert.js"></script>

content/extras/date/convert.ts

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+class Systime {
+    year: number;
+    dayOfYear: number;
+    hundredths: number;
+
+    constructor(date: Date) {
+        this.fromDate(date);
+    }
+
+    fromDate(date: Date): void {
+    }
+
+    toDate(): Date {
+    }
+
+    fromString(str: string): void {
+    }
+
+    toString(): string {
+    }
+};