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Avoid using floating points during timestamp-datetime conversions (#591)

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hakan akyürek 2024-04-20 00:46:30 +02:00 • committed by GitHub
parent 9aedf8ed7f
commit e77672200b
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2 changed files with 19 additions and 2 deletions
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6
msgpack/ext.py
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@ -157,7 +157,9 @@ class Timestamp:
:rtype: `datetime.datetime` :rtype: `datetime.datetime`
""" """
utc = datetime.timezone.utc utc = datetime.timezone.utc
return datetime.datetime.fromtimestamp(0, utc) + datetime.timedelta(seconds=self.to_unix()) return datetime.datetime.fromtimestamp(0, utc) + datetime.timedelta(
seconds=self.seconds, microseconds=self.nanoseconds // 1000
)
@staticmethod @staticmethod
def from_datetime(dt): def from_datetime(dt):
@ -165,4 +167,4 @@ class Timestamp:
:rtype: Timestamp :rtype: Timestamp
""" """
return Timestamp.from_unix(dt.timestamp()) return Timestamp(seconds=int(dt.timestamp()), nanoseconds=dt.microsecond * 1000)

15
test/test_timestamp.py
View file

@ -86,6 +86,21 @@ def test_timestamp_datetime():
utc = datetime.timezone.utc utc = datetime.timezone.utc
assert t.to_datetime() == datetime.datetime(1970, 1, 1, 0, 0, 42, 0, tzinfo=utc) assert t.to_datetime() == datetime.datetime(1970, 1, 1, 0, 0, 42, 0, tzinfo=utc)
ts = datetime.datetime(2024, 4, 16, 8, 43, 9, 420317, tzinfo=utc)
ts2 = datetime.datetime(2024, 4, 16, 8, 43, 9, 420318, tzinfo=utc)
assert (
Timestamp.from_datetime(ts2).nanoseconds - Timestamp.from_datetime(ts).nanoseconds == 1000
)
ts3 = datetime.datetime(2024, 4, 16, 8, 43, 9, 4256)
ts4 = datetime.datetime(2024, 4, 16, 8, 43, 9, 4257)
assert (
Timestamp.from_datetime(ts4).nanoseconds - Timestamp.from_datetime(ts3).nanoseconds == 1000
)
assert Timestamp.from_datetime(ts).to_datetime() == ts
def test_unpack_datetime(): def test_unpack_datetime():
t = Timestamp(42, 14) t = Timestamp(42, 14)