std/datetime/format_test.ts

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "@std/assert";
import { format } from "./format.ts";

Deno.test({
  name: "format()",
  fn: () => {
    // 00 hours
    assertEquals(
      "00:00:00",
      format(new Date("2019-01-01T00:00:00"), "HH:mm:ss"),
    );
    assertEquals(
      "01:00:00",
      format(new Date("2019-01-01T01:00:00"), "HH:mm:ss"),
    );
    assertEquals(
      "13:00:00",
      format(new Date("2019-01-01T13:00:00"), "HH:mm:ss"),
    );

    // 12 hours
    assertEquals(
      "12:00:00",
      format(new Date("2019-01-01T00:00:00"), "hh:mm:ss"),
    );
    assertEquals(
      "01:00:00",
      format(new Date("2019-01-01T01:00:00"), "hh:mm:ss"),
    );
    assertEquals(
      "01:00:00",
      format(new Date("2019-01-01T13:00:00"), "hh:mm:ss"),
    );

    // milliseconds
    assertEquals(
      "13:00:00.000",
      format(new Date("2019-01-01T13:00:00"), "HH:mm:ss.SSS"),
    );
    assertEquals(
      "13:00:00.000",
      format(new Date("2019-01-01T13:00:00.000"), "HH:mm:ss.SSS"),
    );
    assertEquals(
      "13:00:00.123",
      format(new Date("2019-01-01T13:00:00.123"), "HH:mm:ss.SSS"),
    );

    // day period
    assertEquals(
      "00:00:00 AM",
      format(new Date("2019-01-01T00:00:00"), "HH:mm:ss a"),
    );
    assertEquals(
      "12:00:00 AM",
      format(new Date("2019-01-01T00:00:00"), "hh:mm:ss a"),
    );
    assertEquals(
      "01:00:00 AM",
      format(new Date("2019-01-01T01:00:00"), "HH:mm:ss a"),
    );
    assertEquals(
      "01:00:00 AM",
      format(new Date("2019-01-01T01:00:00"), "hh:mm:ss a"),
    );
    assertEquals(
      "01:00:00 PM",
      format(new Date("2019-01-01T13:00:00"), "hh:mm:ss a"),
    );
    assertEquals(
      "21:00:00 PM",
      format(new Date("2019-01-01T21:00:00"), "HH:mm:ss a"),
    );
    assertEquals(
      "09:00:00 PM",
      format(new Date("2019-01-01T21:00:00"), "hh:mm:ss a"),
    );

    // quoted literal
    assertEquals(
      format(new Date(2019, 0, 20), "'today:' yyyy-MM-dd"),
      "today: 2019-01-20",
    );

    assertEquals(
      format(new Date("2019-01-09T21:09:09"), "H:m:s yy-M-d"),
      "21:9:9 19-1-9",
    );

    assertEquals(
      "13:00:00.00",
      format(new Date("2019-01-01T13:00:00.000"), "HH:mm:ss.SS"),
    );

    assertEquals(
      "13:00:00.0",
      format(new Date("2019-01-01T13:00:00.000"), "HH:mm:ss.S"),
    );

    assertEquals(
      "1",
      format(new Date("2019-01-01T13:00:00.000"), "h"),
    );

    assertEquals(
      "2019-01-01 04:00:00.000",
      format(
        new Date("2019-01-01T13:00:00.000+09:00"),
        "yyyy-MM-dd HH:mm:ss.SSS",
        { timeZone: "UTC" },
      ),
    );

    assertEquals(
      "2019-01-01 18:00:00.000",
      format(
        new Date("2019-01-01T13:00:00.000-05:00"),
        "yyyy-MM-dd HH:mm:ss.SSS",
        { timeZone: "UTC" },
      ),
    );
  },
});