Function override

pkgs/core/src/addMonths/test.ts:57–64

(
    base: Date,
    year = base.getFullYear(),
    month = base.getMonth(),
    day = base.getDate(),
    hour = base.getHours(),
    minute = base.getMinutes(),
  )

    Intl.DateTimeFormat().resolvedOptions().timeZone || process.env.tz;
  const HOUR = 1000 * 60 * 60;
  const override = (
    base: Date,
    year = base.getFullYear(),
    month = base.getMonth(),
    day = base.getDate(),
    hour = base.getHours(),
    minute = base.getMinutes(),
  ) => new Date(year, month, day, hour, minute);

  dstOnly(
    `works at DST-start boundary in local timezone: ${tzName || "(unknown)"}`,