Release 2026e - 2026-09-29 17:14:38 -0700

  Briefly:
    Manitoba moves to permanent -05 on 2026-10-31.

  Changes to future timestamps

    Manitoba’s 2026-03-08 spring forward was its last foreseeable clock
    change, as it moved to permanent -05 thereafter.  Model this with
    its traditional abbreviation EST.  Although the change to
    permanent -05 legally takes place on 2026-10-31, temporarily model
    the change to occur on 2026-11-01 at 02:00 for the same reason as
    other recent temporary hacks.  (Caution: see “NOTE FOR 2026b
    TEMPORARY HACK FOR CLDR AND CANADA” below.)

      As the change affects both America/Winnipeg and its backward
      compatibility link, the obsolescent setting TZ="Canada/Central"
      will now use the abbreviation EST for affected timestamps,
      akin to TZ="Canada/Pacific" behavior introduced in 2026b.

      Another TZDB release may be needed soon if any of the portions of
      northwestern Ontario historically aligned with America/Winnipeg do
      not follow.  For now, given the short leadtime with Manitoba’s
      announcement, assume that they will, to avoid creating new zones
      that may not be needed if no divergence occurs.

  Changes to past timestamps
    In 1925 Ireland fell back on 09-20 not 10-04 (thanks to Stan Ulbrych).
  Changes to commentary

    Discussion on timekeeping practices in northwestern Ontario has been
    expanded in light of Manitoba’s recent announcement.  It is not yet
    known whether or to what extent these areas may adapt their own
    timekeeping practices in response.