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Improve performance of from_ordinal of temporal types. #1046

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Apr 24, 2024
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Improve performance of from_ordinal of temporal types. #1046

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47 changes: 7 additions & 40 deletions src/neo4j/time/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -854,35 +854,10 @@ def from_ordinal(cls, ordinal: int) -> Date:
"""
if ordinal == 0:
return ZeroDate
if ordinal >= 736695:
year = 2018 # Project release year
month = 1
day = int(ordinal - 736694)
elif ordinal >= 719163:
year = 1970 # Unix epoch
month = 1
day = int(ordinal - 719162)
else:
year = 1
month = 1
day = int(ordinal)
if day < 1 or day > 3652059:
# Note: this requires a maximum of 22 bits for storage
# Could be transferred in 3 bytes.
raise ValueError("Ordinal out of range (1..3652059)")
if year < MIN_YEAR or year > MAX_YEAR:
raise ValueError("Year out of range (%d..%d)" % (MIN_YEAR, MAX_YEAR))
days_in_year = DAYS_IN_YEAR[year]
while day > days_in_year:
day -= days_in_year
year += 1
days_in_year = DAYS_IN_YEAR[year]
days_in_month = DAYS_IN_MONTH[(year, month)]
while day > days_in_month:
day -= days_in_month
month += 1
days_in_month = DAYS_IN_MONTH[(year, month)]
year, month, day = _normalize_day(year, month, day)
elif ordinal < 0 or ordinal > 3652059:
raise ValueError("Ordinal out of range (0..3652059)")
d = datetime.fromordinal(ordinal)
year, month, day = _normalize_day(d.year, d.month, d.day)
return cls.__new(ordinal, year, month, day)

@classmethod
Expand Down Expand Up @@ -1165,17 +1140,9 @@ def __add__(self, other: Duration) -> Date: # type: ignore[override]
:raises ValueError: if the added duration has a time component.
"""
def add_months(d, months):
years, months = symmetric_divmod(months, 12)
year = d.__year + years
month = d.__month + months
while month > 12:
year += 1
month -= 12
while month < 1:
year -= 1
month += 12
d.__year = year
d.__month = month
overflow_years, month = divmod(months + d.__month - 1, 12)
d.__year += overflow_years
d.__month = month + 1

def add_days(d, days):
assert 1 <= d.__day <= 28 or -28 <= d.__day <= -1
Expand Down