feat: daily notes (dev only) (#1894)

packages/web/src/javascripts/Utils/DateUtils.spec.ts

@@ -0,0 +1,31 @@
+import { addDays } from '@/Utils/DateUtils'
+import { numDaysBetweenDates } from './DateUtils'
+
+describe('date utils', () => {
+  describe('numDaysBetweenDates', () => {
+    it('should return full days diff accurately', () => {
+      const today = new Date()
+
+      expect(numDaysBetweenDates(today, addDays(today, 1))).toEqual(1)
+      expect(numDaysBetweenDates(today, addDays(today, 2))).toEqual(2)
+      expect(numDaysBetweenDates(today, addDays(today, 3))).toEqual(3)
+    })
+
+    it('should return absolute value of difference', () => {
+      const today = new Date()
+
+      expect(numDaysBetweenDates(today, addDays(today, 3))).toEqual(3)
+      expect(numDaysBetweenDates(addDays(today, 3), today)).toEqual(3)
+    })
+
+    it('should return 1 day difference between two dates on different days but 1 hour apart', () => {
+      const today = new Date()
+      const oneHourBeforeMidnight = new Date()
+      oneHourBeforeMidnight.setHours(0, 0, 0, 0)
+      oneHourBeforeMidnight.setHours(-1, 0, 0, 0)
+
+      expect(today.toDateString()).not.toEqual(oneHourBeforeMidnight.toDateString())
+      expect(numDaysBetweenDates(today, oneHourBeforeMidnight)).toEqual(1)
+    })
+  })
+})