feat: profit chart in statistics

src/pages/StatisticsPage/utils/dates.ts

@@ -0,0 +1,15 @@
+export const getDefaultDates = (): [Date, Date] => {
+    const dateTo = new Date();
+    const dateFrom = new Date();
+    dateFrom.setDate(dateTo.getDate() - 28);
+    return [dateFrom, dateTo];
+};
+
+export const dateToString = (date: Date | null) => {
+    if (date === null) return null;
+    const month = date.getMonth() + 1;
+    const day = date.getDate();
+    const monthStr = month < 10 ? `0${month}` : month;
+    const dayStr = day < 10 ? `0${day}` : day;
+    return `${date.getFullYear()}-${monthStr}-${dayStr}`;
+};