Function isUtcLeap

  • isUtcLeap(year): boolean

  • Returns whether the given year is a leap year in UTC time. This always returns the same value regardless of the local timezone.

    This is based on https://docs.microsoft.com/en-us/office/troubleshoot/excel/determine-a-leap-year.

    Parameters

    • year: number | Date

      The year in number or Date format.

    Returns boolean

    true if the given year is a leap year; false otherwise.

    Example: Basic usage

    import { isUtcLeap } from "@std/datetime/is-leap";
    import { assertEquals } from "@std/assert";

    assertEquals(isUtcLeap(new Date("2000-01-01")), true);

    assertEquals(isUtcLeap(new Date("December 31, 1999 23:59:59 GMT-01:00")), true);

    assertEquals(isUtcLeap(2000), true);

    assertEquals(isUtcLeap(1999), false);

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