bitview: reorg part 2

websites/bitview/scripts/core/date.js

@@ -0,0 +1,68 @@
+const ONE_DAY_IN_MS = 1000 * 60 * 60 * 24;
+
+export function todayUTC() {
+  const today = new Date();
+  return new Date(
+    Date.UTC(
+      today.getUTCFullYear(),
+      today.getUTCMonth(),
+      today.getUTCDate(),
+      0,
+      0,
+      0,
+    ),
+  );
+}
+
+/**
+ * @param {Date} date
+ */
+export function toString(date) {
+  return date.toJSON().split("T")[0];
+}
+
+/**
+ * @param {Date} date
+ */
+export function toDateIndex(date) {
+  if (
+    date.getUTCFullYear() === 2009 &&
+    date.getUTCMonth() === 0 &&
+    date.getUTCDate() === 3
+  )
+    return 0;
+  return differenceBetween(date, new Date("2009-01-09"));
+}
+
+/**
+ * @param {Date} start
+ * @param {Date} end
+ */
+export function getRange(start, end) {
+  const dates = /** @type {Date[]} */ ([]);
+  let currentDate = new Date(start);
+  while (currentDate <= end) {
+    dates.push(new Date(currentDate));
+    currentDate.setUTCDate(currentDate.getUTCDate() + 1);
+  }
+  return dates;
+}
+
+/**
+ * @param {Date} date1
+ * @param {Date} date2
+ */
+export function differenceBetween(date1, date2) {
+  return Math.abs(date1.valueOf() - date2.valueOf()) / ONE_DAY_IN_MS;
+}
+
+/**
+ * @param {Date} oldest
+ * @param {Date} youngest
+ * @returns {number}
+ */
+export function getNumberOfDaysBetweenTwoDates(oldest, youngest) {
+  return Math.round(
+    Math.abs((youngest.getTime() - oldest.getTime()) / ONE_DAY_IN_MS),
+  );
+}