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ENH: add explicit overflow guard for large nanosecond timedeltas #63808

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ENH: add explicit overflow guard for large nanosecond timedeltas #63808

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b6fa495
BUG: handle overflow for large nanosecond timedeltas
vishwas-droid Jan 22, 2026
4d2ae21
Merge branch 'main' into fix-timedelta-overflow
vishwas-droid Jan 23, 2026
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6 changes: 6 additions & 0 deletions pandas/_libs/tslibs/timedeltas.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -300,6 +300,12 @@ cdef int64_t _numeric_to_td64ns(
if is_integer_object(item) and item == NPY_NAT:
return NPY_NAT

# Early overflow guard for scalar numeric input
if unit=="ns" and is_integer_object(item):
if item>9223372036854775807 or item <-9223372036854775808:
raise OutOfBoundsTimedelta(
f"Cannot cast {item} from {unit} to 'ns' without overflow."
)
try:
ival = cast_from_unit(item, unit, out_reso)
except OutOfBoundsDatetime as err:
Expand Down
6 changes: 5 additions & 1 deletion pandas/tests/scalar/timedelta/test_constructors.py
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Expand Up @@ -3,7 +3,7 @@

import numpy as np
import pytest

import pandas as pd
from pandas._libs.tslibs import OutOfBoundsTimedelta
from pandas._libs.tslibs.dtypes import NpyDatetimeUnit
from pandas.errors import Pandas4Warning
Expand Down Expand Up @@ -778,3 +778,7 @@ def test_parsed_unit():
# 7 digits after the decimal
td = Timedelta("1 Day 2:03:04.0123450")
assert td.unit == "ns"
def test_to_timedelta_overflow_raises():
msg = "Cannot cast .* from ns to 'ns' without overflow"
with pytest.raises(OutOfBoundsTimedelta, match=msg):
pd.to_timedelta(10**20, unit="ns")