import { assertEquals, assertMatch } from "@std/assert"; import { describe, it } from "@std/testing/bdd"; import { getRelativeTimeUnit, toIso8601Full, toIso8601FullUTC, } from "./datetime.ts"; describe("toIso8601Full", () => { it("formats current local time with offset", () => { const date = new Date(); const result = toIso8601Full(date); assertMatch( result, /^[+-]\d{6}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}(Z|[+-]\d{2}:\d{2})$/, ); }); it("handles dates before year 0 (BC)", () => { const date = new Date(-2000, 0, 1, 0, 0, 0, 0); const result = toIso8601Full(date); assertMatch(result, /^-\d{6}-01-01T00:00:00\.000(Z|[+-]\d{2}:\d{2})$/); }); it("pads components correctly", () => { const date = new Date(7, 0, 2, 3, 4, 5, 6); const result = toIso8601Full(date); assertMatch(result, /^\+001907-01-02T03:04:05\.006(Z|[+-]\d{2}:\d{2})$/); }); it("handles positive and negative timezone offsets", () => { const date = new Date("2025-06-17T12:00:00Z"); const result = toIso8601Full(date); assertMatch( result, /^[+-]\d{6}-06-17T\d{2}:\d{2}:\d{2}\.\d{3}(Z|[+-]\d{2}:\d{2})$/, ); }); }); describe("toIso8601FullUTC", () => { it("always formats in UTC with 'Z'", () => { const date = new Date(Date.UTC(2025, 11, 31, 23, 59, 59, 999)); const result = toIso8601FullUTC(date); assertEquals(result, "+002025-12-31T23:59:59.999Z"); }); it("pads milliseconds and components correctly", () => { const date = new Date(Date.UTC(7, 0, 2, 3, 4, 5, 6)); const result = toIso8601FullUTC(date); assertEquals(result, "+001907-01-02T03:04:05.006Z"); }); it("handles BC dates (negative years)", () => { const date = new Date(Date.UTC(-44, 2, 15, 12, 0, 0, 0)); const result = toIso8601FullUTC(date); assertMatch(result, /^-\d{6}-03-15T12:00:00\.000Z$/); }); }); describe("getRelativeTimeUnit", () => { const now = new Date(); it("returns seconds for differences under a minute", () => { const future = new Date(now.getTime() + 45 * 1000); const [value, unit] = getRelativeTimeUnit(future); assertEquals(unit, "second"); assertEquals(value, 1); }); it("returns minutes for differences under an hour but over a minute", () => { const future = new Date(now.getTime() + 15 * 60 * 1000); const [value, unit] = getRelativeTimeUnit(future); assertEquals(unit, "minute"); assertEquals(value, 15); }); it("returns hours for differences under a day but over an hour", () => { const past = new Date(now.getTime() - 3.2 * 60 * 60 * 1000); const [value, unit] = getRelativeTimeUnit(past); assertEquals(unit, "hour"); assertEquals(value, -3); }); it("returns days for differences under a week but over a day", () => { const past = new Date(now.getTime() - 2.5 * 24 * 60 * 60 * 1000); const [value, unit] = getRelativeTimeUnit(past); assertEquals(unit, "day"); assertEquals(value, -3); }); it("returns weeks for differences under a month but over a week", () => { const future = new Date(now.getTime() + 2.3 * 7 * 24 * 60 * 60 * 1000); const [value, unit] = getRelativeTimeUnit(future); assertEquals(unit, "week"); assertEquals(value, 2); }); it("returns months for differences under a quarter but over a month", () => { const past = new Date(now.getTime() - 1.5 * 30 * 24 * 60 * 60 * 1000); const [value, unit] = getRelativeTimeUnit(past); assertEquals(unit, "month"); assertEquals(value, -2); }); it("returns quarters for differences under a year but over a quarter", () => { const future = new Date(now.getTime() + 5 * 30 * 24 * 60 * 60 * 1000); const [value, unit] = getRelativeTimeUnit(future); assertEquals(unit, "quarter"); assertEquals(value, 2); }); it("returns years for differences over a year", () => { const past = new Date(now.getTime() - 3.4 * 365 * 24 * 60 * 60 * 1000); const [value, unit] = getRelativeTimeUnit(past); assertEquals(unit, "year"); assertEquals(value, -3); }); });