.. index:: single: time_scales .. _time_scales/0:

.. rst-class:: right

object

time_scales

Time scale conversions for UTC, TAI, TT, UT1, TDB, GPS, GST, TCG, and TCB using bundled and optional override data.

| Availability: | logtalk_load(time_scales(loader))

| Author: Paulo Moura | Version: 1:0:0 | Date: 2026-02-26

| Compilation flags: | static, context_switching_calls

| Implements: | public :ref:`time_scales_protocol <time_scales_protocol/0>` | Uses: | :ref:`date <date/0>` | :ref:`time_scales_data <time_scales_data/0>`

| Remarks:

• Supported UTC range: From 1972-01-01T00:00:00Z onwards.
• Time representation: Instants are represented as instant(Scale,Seconds,fraction(Numerator,Denominator)) with normalized fractional part in the [0,1[ interval.

| Inherited public predicates: |  :ref:`time_scales_protocol/0::check_conversion/3`  :ref:`time_scales_protocol/0::check_convert/4`  :ref:`time_scales_protocol/0::check_instant/1`  :ref:`time_scales_protocol/0::check_offset/3`  :ref:`time_scales_protocol/0::clear_dut1_override/0`  :ref:`time_scales_protocol/0::clear_leap_seconds_override/0`  :ref:`time_scales_protocol/0::convert/4`  :ref:`time_scales_protocol/0::dut1_entries/1`  :ref:`time_scales_protocol/0::dut1_source/1`  :ref:`time_scales_protocol/0::instant_to_utc_date_time/2`  :ref:`time_scales_protocol/0::leap_second_date/2`  :ref:`time_scales_protocol/0::leap_seconds_entries/1`  :ref:`time_scales_protocol/0::leap_seconds_source/1`  :ref:`time_scales_protocol/0::load_dut1_override/1`  :ref:`time_scales_protocol/0::load_leap_seconds_override/1`  :ref:`time_scales_protocol/0::offset/3`  :ref:`time_scales_protocol/0::save_dut1_entries/1`  :ref:`time_scales_protocol/0::save_leap_seconds_entries/1`  :ref:`time_scales_protocol/0::supported_range/2`  :ref:`time_scales_protocol/0::utc_date_time_to_instant/2`  :ref:`time_scales_protocol/0::valid_conversion/3`  :ref:`time_scales_protocol/0::valid_instant/1`  :ref:`time_scales_protocol/0::valid_scale/1`  

.. 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

(no local declarations; see entity ancestors if any)

Operators

(none)

.. seealso::

:ref:`time_scales_protocol <time_scales_protocol/0>`, :ref:`date <date/0>`