.. index:: single: tzif_zone_ids
.. _tzif_zone_ids/0:

.. rst-class:: right

**object**

``tzif_zone_ids``
=================

Bundled canonical TZDB zone ids and backward-compatible aliases derived from IANA TZDB 2026a.

| **Availability:** 
|    ``logtalk_load(tzif(loader))``

| **Author:** Paulo Moura
| **Version:** 1:0:0
| **Date:** 2026-04-07

| **Compilation flags:**
|    ``static, context_switching_calls``


| **Dependencies:**
|   (none)


| **Remarks:**
|    (none)

| **Inherited public predicates:**
|    (none)

.. contents::
   :local:
   :backlinks: top

Public predicates
-----------------

.. index:: tzdb_version/1
.. _tzif_zone_ids/0::tzdb_version/1:

``tzdb_version/1``
^^^^^^^^^^^^^^^^^^

Bundled IANA TZDB release used to derive the zone-id table.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``tzdb_version(Version)``
| **Mode and number of proofs:**
|    ``tzdb_version(-atom)`` - ``one``


------------

.. index:: known_zone_id/1
.. _tzif_zone_ids/0::known_zone_id/1:

``known_zone_id/1``
^^^^^^^^^^^^^^^^^^^

True when the argument is a bundled canonical TZDB zone id or backward-compatible alias.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``known_zone_id(ZoneId)``
| **Mode and number of proofs:**
|    ``known_zone_id(+atom)`` - ``zero_or_one``


------------

.. index:: zone_id_kind/2
.. _tzif_zone_ids/0::zone_id_kind/2:

``zone_id_kind/2``
^^^^^^^^^^^^^^^^^^

Classifies a bundled zone id as canonical or as a backward-compatible alias targeting another zone id.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``zone_id_kind(ZoneId,Kind)``
| **Mode and number of proofs:**
|    ``zone_id_kind(+atom,-compound)`` - ``zero_or_one``


------------

Protected predicates
--------------------

(none)

Private predicates
------------------

(none)

Operators
---------

(none)