.. index:: single: tzif
.. _tzif/0:

.. rst-class:: right

**object**

``tzif``
========

Loader, per-zone cache and snapshot persistence support, and zone-aware UTC lookup predicates for TZif v1/v2/v3 files.

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

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

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


| **Implements:**
|    ``public`` :ref:`tzif_protocol <tzif_protocol/0>`
| **Uses:**
|    :ref:`date <date/0>`
|    :ref:`list <list/0>`
|    :ref:`logtalk <logtalk/0>`
|    :ref:`os <os/0>`
|    :ref:`reader <reader/0>`
|    :ref:`tzif_zone_ids <tzif_zone_ids/0>`

| **Remarks:**
|    (none)

| **Inherited public predicates:**
|     :ref:`tzif_protocol/0::abbreviation/2`  :ref:`tzif_protocol/0::abbreviation/3`  :ref:`tzif_protocol/0::abbreviation/4`  :ref:`tzif_protocol/0::cache/1`  :ref:`tzif_protocol/0::cache_source/1`  :ref:`tzif_protocol/0::cached_tzif/1`  :ref:`tzif_protocol/0::clear_cache/0`  :ref:`tzif_protocol/0::daylight_saving_time/2`  :ref:`tzif_protocol/0::daylight_saving_time/3`  :ref:`tzif_protocol/0::daylight_saving_time/4`  :ref:`tzif_protocol/0::load/1`  :ref:`tzif_protocol/0::load/2`  :ref:`tzif_protocol/0::local_abbreviation/2`  :ref:`tzif_protocol/0::local_abbreviation/3`  :ref:`tzif_protocol/0::local_abbreviation/4`  :ref:`tzif_protocol/0::local_abbreviation_reified/2`  :ref:`tzif_protocol/0::local_abbreviation_reified/3`  :ref:`tzif_protocol/0::local_abbreviation_reified/4`  :ref:`tzif_protocol/0::local_abbreviation_with_resolution/3`  :ref:`tzif_protocol/0::local_abbreviation_with_resolution/4`  :ref:`tzif_protocol/0::local_abbreviation_with_resolution/5`  :ref:`tzif_protocol/0::local_daylight_saving_time/2`  :ref:`tzif_protocol/0::local_daylight_saving_time/3`  :ref:`tzif_protocol/0::local_daylight_saving_time/4`  :ref:`tzif_protocol/0::local_daylight_saving_time_reified/2`  :ref:`tzif_protocol/0::local_daylight_saving_time_reified/3`  :ref:`tzif_protocol/0::local_daylight_saving_time_reified/4`  :ref:`tzif_protocol/0::local_daylight_saving_time_with_resolution/3`  :ref:`tzif_protocol/0::local_daylight_saving_time_with_resolution/4`  :ref:`tzif_protocol/0::local_daylight_saving_time_with_resolution/5`  :ref:`tzif_protocol/0::local_offset/2`  :ref:`tzif_protocol/0::local_offset/3`  :ref:`tzif_protocol/0::local_offset/4`  :ref:`tzif_protocol/0::local_offset_reified/2`  :ref:`tzif_protocol/0::local_offset_reified/3`  :ref:`tzif_protocol/0::local_offset_reified/4`  :ref:`tzif_protocol/0::local_offset_with_resolution/3`  :ref:`tzif_protocol/0::local_offset_with_resolution/4`  :ref:`tzif_protocol/0::local_offset_with_resolution/5`  :ref:`tzif_protocol/0::local_time_type/2`  :ref:`tzif_protocol/0::local_time_type/3`  :ref:`tzif_protocol/0::local_time_type/4`  :ref:`tzif_protocol/0::local_time_type_reified/2`  :ref:`tzif_protocol/0::local_time_type_reified/3`  :ref:`tzif_protocol/0::local_time_type_reified/4`  :ref:`tzif_protocol/0::local_time_type_with_resolution/3`  :ref:`tzif_protocol/0::local_time_type_with_resolution/4`  :ref:`tzif_protocol/0::local_time_type_with_resolution/5`  :ref:`tzif_protocol/0::offset/2`  :ref:`tzif_protocol/0::offset/3`  :ref:`tzif_protocol/0::offset/4`  :ref:`tzif_protocol/0::save/1`  :ref:`tzif_protocol/0::save/2`  :ref:`tzif_protocol/0::time_type/2`  :ref:`tzif_protocol/0::time_type/3`  :ref:`tzif_protocol/0::time_type/4`  :ref:`tzif_protocol/0::zone/3`  :ref:`tzif_protocol/0::zones/1`  :ref:`tzif_protocol/0::zones/2`  

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

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

(no local declarations; see entity ancestors if any)

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

(no local declarations; see entity ancestors if any)

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

.. index:: cached_tzif_/2
.. _tzif/0::cached_tzif_/2:

``cached_tzif_/2``
^^^^^^^^^^^^^^^^^^

Table holding the currently cached TZif terms keyed by zone identifier.

| **Compilation flags:**
|    ``dynamic``

| **Template:**
|    ``cached_tzif_(Zone,TZif)``
| **Mode and number of proofs:**
|    ``cached_tzif_(?atom,?compound)`` - ``zero_or_more``


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

Operators
---------

(none)