Website components. Update chart component.

lib/date.js

@@ -1,5 +1,5 @@
 import moment from 'moment-timezone';
-import { addMinutes } from 'date-fns';
+import { addMinutes, endOfDay, subDays, subHours } from 'date-fns';
 
 export function getTimezone() {
   const tz = moment.tz.guess();
@@ -9,3 +9,29 @@ export function getTimezone() {
 export function getLocalTime(t) {
   return addMinutes(new Date(t), new Date().getTimezoneOffset());
 }
+
+export function getDateRange(value) {
+  const now = new Date();
+  const endToday = endOfDay(now);
+
+  switch (value) {
+    case '7d':
+      return {
+        startDate: subDays(endToday, 7),
+        endDate: endToday,
+        unit: 'day',
+      };
+    case '30d':
+      return {
+        startDate: subDays(endToday, 30),
+        endDate: endToday,
+        unit: 'day',
+      };
+    default:
+      return {
+        startDate: subHours(now, 24),
+        endDate: now,
+        unit: 'hour',
+      };
+  }
+}