1 files changed, 26 insertions, 0 deletions
diff --git a/src/misc/aidc.ts b/src/misc/aidc.ts
new file mode 100644
index 0000000000..75168ac307
--- /dev/null
+++ b/src/misc/aidc.ts
@@ -0,0 +1,26 @@
+// AID(Cheep)
+// 長さ6の[2000年1月1日からの経過秒をbase36でエンコードしたもの] + 長さ3の[ランダムな文字列]
+
+const CHARS = '0123456789abcdefghijklmnopqrstuvwxyz';
+const TIME2000 = 946684800000;
+
+function getTime(time: number) {
+	time = time - TIME2000;
+	if (time < 0) time = 0;
+	time = Math.floor(time / 1000);
+	return time.toString(36);
+}
+
+function getRandom() {
+	let str = '';
+
+	for (let i = 0; i < 3; i++) {
+		str += CHARS[Math.floor(Math.random() * CHARS.length)];
+	}
+
+	return str;
+}
+
+export function genAidc(date: Date): string {
+	return getTime(date.getTime()).padStart(6, CHARS[0]) + getRandom();
+}