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gh-91928: Add datetime.UTC alias for datetime.timezone.utc #91973

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Merged
merged 8 commits into from
May 3, 2022
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gh-91928: Add datetime.UTC alias for datetime.timezone.utc #91973

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65fbe0d
feat(datetime): Add `datetime.UTC` alias for `datetime.timezone.utc`
Kab1r Apr 27, 2022
ce04985
docs: Add NEWS entry for #91973
Kab1r Apr 27, 2022
28f228b
docs: add contribution acknowledgement
Kab1r Apr 27, 2022
cefda33
docs(datetime): clarify `UTC` timezone singleton
Kab1r Apr 27, 2022
1e8257d
docs(datetime): add versionadded to `datetime.UTC`
Kab1r Apr 27, 2022
7335f0a
test(datetime): add test for `datetime.UTC` alias
Kab1r Apr 27, 2022
185c7ac
fix(datetime): move `datetime.UTC` definition to end to ensure that i…
Kab1r Apr 27, 2022
9542f54
Clean up nits
pganssle May 3, 2022
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6 changes: 6 additions & 0 deletions Doc/library/datetime.rst
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Expand Up @@ -84,6 +84,12 @@ The :mod:`datetime` module exports the following constants:
The largest year number allowed in a :class:`date` or :class:`.datetime` object.
:const:`MAXYEAR` is ``9999``.

.. attribute:: UTC

Alias for the UTC timezone singleton :attr:`datetime.timezone.utc`.

.. versionadded:: 3.11

Available Types
---------------

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5 changes: 3 additions & 2 deletions Lib/datetime.py
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Expand Up @@ -5,7 +5,7 @@
"""

__all__ = ("date", "datetime", "time", "timedelta", "timezone", "tzinfo",
"MINYEAR", "MAXYEAR")
"MINYEAR", "MAXYEAR", "UTC")


import time as _time
Expand Down Expand Up @@ -2290,7 +2290,8 @@ def _name_from_offset(delta):
return f'UTC{sign}{hours:02d}:{minutes:02d}:{seconds:02d}'
return f'UTC{sign}{hours:02d}:{minutes:02d}'

timezone.utc = timezone._create(timedelta(0))
UTC = timezone.utc = timezone._create(timedelta(0))

# bpo-37642: These attributes are rounded to the nearest minute for backwards
# compatibility, even though the constructor will accept a wider range of
# values. This may change in the future.
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7 changes: 6 additions & 1 deletion Lib/test/datetimetester.py
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Expand Up @@ -28,6 +28,7 @@
from datetime import tzinfo
from datetime import time
from datetime import timezone
from datetime import UTC
from datetime import date, datetime
import time as _time

Expand Down Expand Up @@ -66,6 +67,9 @@ def test_constants(self):
self.assertEqual(datetime.MINYEAR, 1)
self.assertEqual(datetime.MAXYEAR, 9999)

def test_utc_alias(self):
self.assertIs(UTC, timezone.utc)

def test_all(self):
"""Test that __all__ only points to valid attributes."""
all_attrs = dir(datetime_module)
Expand All @@ -81,7 +85,7 @@ def test_name_cleanup(self):
if not name.startswith('__') and not name.endswith('__'))
allowed = set(['MAXYEAR', 'MINYEAR', 'date', 'datetime',
'datetime_CAPI', 'time', 'timedelta', 'timezone',
'tzinfo', 'sys'])
'tzinfo', 'UTC', 'sys'])
self.assertEqual(names - allowed, set([]))

def test_divide_and_round(self):
Expand Down Expand Up @@ -310,6 +314,7 @@ def test_dst(self):

def test_tzname(self):
self.assertEqual('UTC', timezone.utc.tzname(None))
self.assertEqual('UTC', UTC.tzname(None))
self.assertEqual('UTC', timezone(ZERO).tzname(None))
self.assertEqual('UTC-05:00', timezone(-5 * HOUR).tzname(None))
self.assertEqual('UTC+09:30', timezone(9.5 * HOUR).tzname(None))
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1 change: 1 addition & 0 deletions Misc/ACKS
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Expand Up @@ -987,6 +987,7 @@ Toshio Kuratomi
Ilia Kurenkov
Vladimir Kushnir
Erno Kuusela
Kabir Kwatra
Ross Lagerwall
Cameron Laird
Loïc Lajeanne
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2022-04-26-18-02-44.gh-issue-91928.V0YveU.rst
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@@ -0,0 +1,3 @@
Add `datetime.UTC` alias for `datetime.timezone.utc`.

Patch by Kabir Kwatra.
4 changes: 4 additions & 0 deletions Modules/_datetimemodule.c
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Expand Up @@ -6634,6 +6634,10 @@ _datetime_exec(PyObject *module)
return -1;
}

if (PyModule_AddObjectRef(module, "UTC", PyDateTime_TimeZone_UTC) < 0) {
return -1;
}

/* A 4-year cycle has an extra leap day over what we'd get from
* pasting together 4 single years.
*/
Expand Down