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AArdeev merged 1 commit into from
May 28, 2026
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datetime: documented parse of time with h.hh or m.mm #5672

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33 changes: 33 additions & 0 deletions doc/reference/reference_lua/datetime.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -284,6 +284,37 @@ Functions
:return: a number of parsed characters
:rtype: number

**Implementation details:**

* For formats with a decimal fraction of the second ([1], 5.3.1.4, a)
the tail beyond 9 fracitonal digits is truncated.

.. code-block:: tarantoolsession

tarantool> datetime.parse('2024-07-31T17:30:00.123456789999', {format = 'iso8601'})
---
- 2024-07-31T17:30:00.123456789Z
- 32
...

* For formats with a decimal fraction of the hour ([1], 5.3.1.4, c)
or minute ([1], 5.3.1.4, b) fractions are truncated to seconds precision.
If second fractions are desired, explicit representation (format a) must be used.

.. code-block:: tarantoolsession

tarantool> datetime.parse('2024-07-31T17,333333333', {format = 'iso8601'})
---
- 2024-07-31T17:19:59Z
- 23
...

tarantool> datetime.parse('2024-07-31T17:30.333333333', {format = 'iso8601'})
---
- 2024-07-31T17:30:19Z
- 26
...
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@AArdeev AArdeev May 28, 2026

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**Implementation details:**

*  For formats with a decimal fraction of the second ([1], 5.3.1.4, a)
    the tail beyond 9 fracitonal digits is truncated.

    ..  code-block:: tarantoolsession

        tarantool> datetime.parse('2024-07-31T17:30:00.123456789999', {format = 'iso8601'})
        ---
        - 2024-07-31T17:30:00.123456789Z
        - 32
        ...

*  For formats with a decimal fraction of the hour ([1], 5.3.1.4, c)
    or minute ([1], 5.3.1.4, b) fractions are truncated to seconds precision.
    If second fractions are desired, explicit representation (format a) must be used.

    ..  code-block:: tarantoolsession

        tarantool> datetime.parse('2024-07-31T17,333333333', {format = 'iso8601'})
        ---
        - 2024-07-31T17:19:59Z
        - 23
        ...

        tarantool> datetime.parse('2024-07-31T17:30.333333333', {format = 'iso8601'})
        ---
        - 2024-07-31T17:30:19Z
        - 26
        ...

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@tmr-g tmr-g May 28, 2026

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Thanks! Fixed.


**Example:**

.. code-block:: tarantoolsession
Expand Down Expand Up @@ -1211,6 +1242,8 @@ Limitations
References
----------

* [1] `ISO 8601-1:2019: Date and time — Representations for information interchange. Part 1: Basic rules <https://www.iso.org/standard/70907.html>`_

* `RFC 3339: Date and Time on the Internet: Timestamps <https://www.rfc-editor.org/rfc/rfc3339>`_

* `ISO 8601: Date and time format <https://www.iso.org/iso-8601-date-and-time-format.html>`_
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