feat: default journal period to last 7 days

src/shared/lib/calendar.ts

@@ -9,6 +9,9 @@ function isValidPeriod(from: null | string, to: null | string) {
 	);
 }
 
+const DAY_MS = 86_400_000;
+const DEFAULT_PERIOD_DAYS = 6;
+
 const moscowFormatter = new Intl.DateTimeFormat("en-CA", {
 	day: "2-digit",
 	month: "2-digit",
@@ -22,6 +25,14 @@ function compareDateDesc(a: null | string, b: null | string) {
 	return (b ?? "").localeCompare(a ?? "");
 }
 
+// Last 7 days including today. An empty period always means this range.
+function defaultPeriod(): [string, string] {
+	const to = new Date();
+	const from = new Date(to.getTime() - DEFAULT_PERIOD_DAYS * DAY_MS);
+
+	return [moscowDate(from), moscowDate(to)];
+}
+
 function moscowDate(value: Date): string {
 	const parts = moscowFormatter.formatToParts(value);
 
@@ -31,4 +42,4 @@ function moscowDate(value: Date): string {
 	return `${part("year")}-${part("month")}-${part("day")}`;
 }
 
-export { compareDateDesc, isValidPeriod, moscowDate };
+export { compareDateDesc, defaultPeriod, isValidPeriod, moscowDate };