gh-41431: Add `datetime.time.strptime()` and `datetime.date.strptime()` (#120752)

* Python implementation

* C implementation

* Test `date.strptime`

* Test `time.strptime`

* 📜🤖 Added by blurb_it.

* Update whatsnew

* Update documentation

* Add leap year note

* Update 2024-06-19-19-53-42.gh-issue-41431.gnkUc5.rst

* Apply suggestions from code review

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* Remove parentheses

* Use helper function

* Remove bad return

* Link to github issue

* Fix directive

* Apply suggestions from code review

Co-authored-by: Paul Ganssle <1377457+pganssle@users.noreply.github.com>

* Fix test cases

---------

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Paul Ganssle <1377457+pganssle@users.noreply.github.com>

1 files changed, 33 insertions, 11 deletions

diff --git a/Lib/_strptime.py b/Lib/_strptime.py
index 3f868bc..a3f8bb5 100644
--- a/Lib/_strptime.py
+++ b/Lib/_strptime.py
@@ -567,18 +567,40 @@ def _strptime_time(data_string, format="%a %b %d %H:%M:%S %Y"):
     tt = _strptime(data_string, format)[0]
     return time.struct_time(tt[:time._STRUCT_TM_ITEMS])
 
-def _strptime_datetime(cls, data_string, format="%a %b %d %H:%M:%S %Y"):
-    """Return a class cls instance based on the input string and the
+def _strptime_datetime_date(cls, data_string, format="%a %b %d %Y"):
+    """Return a date instance based on the input string and the
+    format string."""
+    tt, _, _ = _strptime(data_string, format)
+    args = tt[:3]
+    return cls(*args)
+
+def _parse_tz(tzname, gmtoff, gmtoff_fraction):
+    tzdelta = datetime_timedelta(seconds=gmtoff, microseconds=gmtoff_fraction)
+    if tzname:
+        return datetime_timezone(tzdelta, tzname)
+    else:
+        return datetime_timezone(tzdelta)
+
+def _strptime_datetime_time(cls, data_string, format="%H:%M:%S"):
+    """Return a time instance based on the input string and the
     format string."""
     tt, fraction, gmtoff_fraction = _strptime(data_string, format)
     tzname, gmtoff = tt[-2:]
-    args = tt[:6] + (fraction,)
-    if gmtoff is not None:
-        tzdelta = datetime_timedelta(seconds=gmtoff, microseconds=gmtoff_fraction)
-        if tzname:
-            tz = datetime_timezone(tzdelta, tzname)
-        else:
-            tz = datetime_timezone(tzdelta)
-        args += (tz,)
+    args = tt[3:6] + (fraction,)
+    if gmtoff is None:
+        return cls(*args)
+    else:
+        tz = _parse_tz(tzname, gmtoff, gmtoff_fraction)
+        return cls(*args, tz)
 
-    return cls(*args)
+def _strptime_datetime_datetime(cls, data_string, format="%a %b %d %H:%M:%S %Y"):
+    """Return a datetime instance based on the input string and the
+    format string."""
+    tt, fraction, gmtoff_fraction = _strptime(data_string, format)
+    tzname, gmtoff = tt[-2:]
+    args = tt[:6] + (fraction,)
+    if gmtoff is None:
+        return cls(*args)
+    else:
+        tz = _parse_tz(tzname, gmtoff, gmtoff_fraction)
+        return cls(*args, tz)