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from zoneinfo import ZoneInfo from datetime import datetime # Cache timezone object (reuse, not re-instantiate) UTC = ZoneInfo("UTC") NY = ZoneInfo("America/New_York") # Bulk conversion with pandas (much faster than loop) import pandas as pd ts_series = pd.Series([1718456400, 1718542800, 1718629200]) datetimes = pd.to_datetime(ts_series, unit="s", utc=True) # Avoid strptime in tight loops — parse once, add timedelta base = datetime(2024, 1, 1, tzinfo=UTC) dates = [base + timedelta(i) for i in range(365)]
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