issue pandas-dev#55462 fix

Kman303 · Oct 26, 2023 · 541c3b3 · 541c3b3
1 parent e0d6051
commit 541c3b3
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Showing 2 changed files with 7 additions and 1 deletion.
diff --git a/pandas/_libs/tslibs/timestamps.pyx b/pandas/_libs/tslibs/timestamps.pyx
@@ -315,7 +315,10 @@ cdef class _Timestamp(ABCTimestamp):
     def __hash__(_Timestamp self):
         if self.nanosecond:
             return hash(self._value)
-        if not (1 <= self.year <= 9999):
+        if (self.year == 0):
+            year = -1
+            return hash(self._value)
+        if not (-9999 <= self.year <= 9999):
             # out of bounds for pydatetime
             return hash(self._value)
         if self.fold:

diff --git a/pandas/core/tools/datetimes.py b/pandas/core/tools/datetimes.py
@@ -1098,6 +1098,9 @@ def to_datetime(
     result: Timestamp | NaTType | Series | Index
 
     if isinstance(arg, Timestamp):
+        if arg.year <= 0:
+            year_ = abs(arg.year-1)
+            return Timestamp(year=year_,month=arg.month,day=arg.day)
         result = arg
         if utc:
             if arg.tz is not None: