gh-128074: Support +HH format as time zone for strptime

Doc/library/datetime.rst

@@ -2547,8 +2547,8 @@ requires, and these work on all platforms with a standard C implementation.
 |           | digits.                        |                        |       |
 +-----------+--------------------------------+------------------------+-------+
 | ``%z``    | UTC offset in the form         | (empty), +0000,        | \(6)  |
-|           | ``±HHMM[SS[.ffffff]]`` (empty  | -0400, +1030,          |       |
-|           | string if the object is        | +063415,               |       |
+|           | ``±HH[MM[SS[.ffffff]]]``       | -0400, +1030,          |       |
+|           | (empty string if the object is | +063415,               |       |
 |           | naive).                        | -030712.345216         |       |
 +-----------+--------------------------------+------------------------+-------+
 | ``%Z``    | Time zone name (empty string   | (empty), UTC, GMT      | \(6)  |
@@ -2609,7 +2609,7 @@ convenience. These parameters all correspond to ISO 8601 date values.
 |           | Jan 4.                         |                        |       |
 +-----------+--------------------------------+------------------------+-------+
 | ``%:z``   | UTC offset in the form         | (empty), +00:00,       | \(6)  |
-|           | ``±HH:MM[:SS[.ffffff]]``       | -04:00, +10:30,        |       |
+|           | ``±HH[:MM[:SS[.ffffff]]]``     | -04:00, +10:30,        |       |
 |           | (empty string if the object is | +06:34:15,             |       |
 |           | naive).                        | -03:07:12.345216       |       |
 +-----------+--------------------------------+------------------------+-------+
@@ -2707,7 +2707,7 @@ Notes:
 
    ``%z``
       :meth:`~.datetime.utcoffset` is transformed into a string of the form
-      ``±HHMM[SS[.ffffff]]``, where ``HH`` is a 2-digit string giving the number
+      ``±HH[MM[SS[.ffffff]]]``, where ``HH`` is a 2-digit string giving the number
       of UTC offset hours, ``MM`` is a 2-digit string giving the number of UTC
       offset minutes, ``SS`` is a 2-digit string giving the number of UTC offset
       seconds and ``ffffff`` is a 6-digit string giving the number of UTC

Lib/_strptime.py

@@ -371,7 +371,7 @@ def __init__(self, locale_time=None):
             # W is set below by using 'U'
             'y': r"(?P<y>\d\d)",
             'Y': r"(?P<Y>\d\d\d\d)",
-            'z': r"(?P<z>([+-]\d\d:?[0-5]\d(:?[0-5]\d(\.\d{1,6})?)?)|(?-i:Z))?",
+            'z': r"(?P<z>([+-]\d\d(:?[0-5]\d(:?[0-5]\d(\.\d{1,6})?)?)?)|(?-i:Z))?",
             'A': self.__seqToRE(self.locale_time.f_weekday, 'A'),
             'a': self.__seqToRE(self.locale_time.a_weekday, 'a'),
             'B': self.__seqToRE(_fixmonths(self.locale_time.f_month[1:]), 'B'),
@@ -668,15 +668,15 @@ def parse_int(s):
                 if z == 'Z':
                     gmtoff = 0
                 else:
-                    if z[3] == ':':
+                    if len(z) != 3 and z[3] == ':':
                         z = z[:3] + z[4:]
                         if len(z) > 5:
                             if z[5] != ':':
                                 msg = f"Inconsistent use of : in {found_dict['z']}"
                                 raise ValueError(msg)
                             z = z[:5] + z[6:]
                     hours = int(z[1:3])
-                    minutes = int(z[3:5])
+                    minutes = int(z[3:5] or 0)
                     seconds = int(z[5:7] or 0)
                     gmtoff = (hours * 60 * 60) + (minutes * 60) + seconds
                     gmtoff_remainder = z[8:]

Lib/test/datetimetester.py

@@ -2889,6 +2889,8 @@ def test_strptime(self):
 
         strptime = self.theclass.strptime
 
+        self.assertEqual(strptime("+01", "%z").utcoffset(), 1 * HOUR)
+        self.assertEqual(strptime("-10", "%z").utcoffset(), -10 * HOUR)
         self.assertEqual(strptime("+0002", "%z").utcoffset(), 2 * MINUTE)
         self.assertEqual(strptime("-0002", "%z").utcoffset(), -2 * MINUTE)
         self.assertEqual(
@@ -4035,6 +4037,8 @@ def test_strptime(self):
 
     def test_strptime_tz(self):
         strptime = self.theclass.strptime
+        self.assertEqual(strptime("+01", "%z").utcoffset(), 1 * HOUR)
+        self.assertEqual(strptime("-10", "%z").utcoffset(), -10 * HOUR)
         self.assertEqual(strptime("+0002", "%z").utcoffset(), 2 * MINUTE)
         self.assertEqual(strptime("-0002", "%z").utcoffset(), -2 * MINUTE)
         self.assertEqual(

Lib/test/test_strptime.py

@@ -394,6 +394,12 @@ def test_offset(self):
         one_hour = 60 * 60
         half_hour = 30 * 60
         half_minute = 30
+        (*_, offset), _, offset_fraction = _strptime._strptime("+09", "%z")
+        self.assertEqual(offset, 9 * one_hour)
+        self.assertEqual(offset_fraction, 0)
+        (*_, offset), _, offset_fraction = _strptime._strptime("-01", "%z")
+        self.assertEqual(offset, -one_hour)
+        self.assertEqual(offset_fraction, 0)
         (*_, offset), _, offset_fraction = _strptime._strptime("+0130", "%z")
         self.assertEqual(offset, one_hour + half_hour)
         self.assertEqual(offset_fraction, 0)

Misc/NEWS.d/next/Library/2025-02-21-07-34-37.gh-issue-128074.qeCRrp.rst

@@ -0,0 +1,4 @@
+Update input time zone format from ``±HHMM[SS[.ffffff]]`` to
+``±HH[MM[SS[.ffffff]]]`` for :meth:`datetime.date.strptime`,
+:meth:`datetime.datetime.strptime` and :meth:`datetime.time.strptime` methods.
+Patch by Semyon Moroz.