Format uptimes (#3629)

* Format uptime

* 逆だわ

* ザ

* 1個多い

* Fix comment

src/client/app/common/scripts/format-uptime.ts

@@ -0,0 +1,25 @@
+
+/**
+ * Format like the uptime command
+ */
+export default function(sec) {
+	if (!sec) return sec;
+
+	const day = Math.floor(sec / 86400);
+	const tod = sec % 86400;
+
+	// Days part in string: 2 days, 1 day, null
+	const d = day >= 2 ? `${day} days` : day >= 1 ? `${day} day` : null;
+
+	// Time part in string: 1 sec, 1 min, 1:01
+	const t
+		= tod < 60 ? `${Math.floor(tod)} sec`
+		: tod < 3600 ? `${Math.floor(tod / 60)} min`
+		: `${Math.floor(tod / 60 / 60)}:${Math.floor((tod / 60) % 60).toString().padStart(2, "0")}`;
+
+	let str = '';
+	if (d) str += `${d}, `;
+	str += t;
+
+	return str;
+}