feat: adds dayStart, dayEnd to tests

src/__tests__/tempo.spec.ts

@@ -13,6 +13,8 @@ import {
   addMinute,
   addSecond,
   addHour,
+  dayStart,
+  dayEnd,
   format,
   formatStr,
   sameDay,
@@ -1252,3 +1254,19 @@ describe("nearestDay", () => {
     )
   })
 })
+
+describe("dayStart", () => {
+  it("can become the start of the day", () => {
+    expect(dayStart("2023-02-22T12:00:00Z").toISOString()).toBe(
+      "2023-02-22T05:00:00.000Z"
+    )
+  })
+})
+
+describe("dayEnd", () => {
+  it("can become the start of the day", () => {
+    expect(dayEnd("2023-02-22T12:00:00Z").toISOString()).toBe(
+      "2023-02-23T04:59:59.999Z"
+    )
+  })
+})

src/dayEnd.ts

@@ -0,0 +1,11 @@
+import { date } from "./date"
+
+/**
+ * Returns a Date object for end of the given day.
+ * @param inputDate - A string or Date object
+ */
+export function dayEnd(inputDate: DateInput): Date {
+  const d = date(inputDate)
+  d.setHours(23, 59, 59, 999)
+  return d
+}

src/index.ts

@@ -8,6 +8,7 @@ export { ap } from "./ap"
 export { applyOffset } from "./applyOffset"
 export { date } from "./date"
 export { dayOfYear } from "./dayOfYear"
+export { dayEnd } from "./dayEnd"
 export { dayStart } from "./dayStart"
 export { format } from "./format"
 export { formatStr } from "./formatStr"