refactor progress

packages/time/src/Rfc3339Timestamp.tsx

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+function createInvalidRfc3339TimestampError(timestamp: string): Error {
+	return new Error(`Invalid RFC3339 timestamp: ${timestamp}`);
+}
+
+export function parseRfc3339TimestampToMs(timestamp: string): number {
+	const date = new Date(timestamp);
+	const parsedTimestampMs = date.getTime();
+
+	if (!Number.isFinite(parsedTimestampMs)) {
+		throw createInvalidRfc3339TimestampError(timestamp);
+	}
+
+	return parsedTimestampMs;
+}
+
+export function formatRfc3339Timestamp(timestampMs: number): string {
+	if (!Number.isFinite(timestampMs)) {
+		throw new Error(`Invalid timestamp milliseconds: ${timestampMs}`);
+	}
+
+	return new Date(timestampMs).toISOString();
+}