refactor: simplify calendar and form state

src/pages/account-income/model/period.ts

@@ -1,47 +1,22 @@
-const ISO_DATE_LENGTH = 10;
+import { calendarDate } from "@/shared/lib";
+
 const DATE_PART_COUNT = 3;
 
 type IncomePeriod = { from: string; to: string };
 
-const datePattern = /^\d{4}-\d{2}-\d{2}$/;
-
 function formatDraftDate(value: string): string {
 	const [year, month, day] = value.split("-", DATE_PART_COUNT);
 
 	return `${day}.${month}.${year}`;
 }
 
-function isDate(value: string): boolean {
-	if (!datePattern.test(value)) return false;
-	const parsed = new Date(`${value}T00:00:00Z`);
-
-	return (
-		Number.isFinite(parsed.valueOf())
-		&& parsed.toISOString().slice(0, ISO_DATE_LENGTH) === value
-	);
-}
-
-function moscowDate(value: Date): string {
-	const parts = new Intl.DateTimeFormat("en-CA", {
-		day: "2-digit",
-		month: "2-digit",
-		timeZone: "Europe/Moscow",
-		year: "numeric",
-	}).formatToParts(value);
-
-	const part = (type: string) =>
-		parts.find(item => item.type === type)?.value;
-
-	return `${part("year")}-${part("month")}-${part("day")}`;
-}
-
 function parseDraftDate(value: string): null | string {
 	if (!/^\d{2}\.\d{2}\.\d{4}$/.test(value))
 		return null;
 	const [day, month, year] = value.split(".", DATE_PART_COUNT);
 	const date = `${year}-${month}-${day}`;
 
-	return isDate(date)
+	return calendarDate.safeParse(date).success
 		? date
 		: null;
 }
@@ -50,8 +25,5 @@ export {
 	formatDraftDate,
 	type IncomePeriod as IncomeForm,
 	type IncomePeriod,
-	isDate,
-	ISO_DATE_LENGTH,
-	moscowDate,
 	parseDraftDate,
 };